Merge branch 'develop' into dmitriymx/location-refactory

# Conflicts:
#	core/src/main/java/mc/core/Location.java
#	flat_world/src/main/java/mc/world/flat/FlatWorld.java
#	generated_world/src/main/java/mc/world/generated_world/world/CubicWorld.java
#	proto_1.12.2_netty/src/main/java/mc/core/network/proto_1_12_2/netty/handlers/LoginHandler.java

build.gradle

@@ -1,4 +1,4 @@
-subprojects {
+allprojects {
     apply plugin: 'java'
 
     compileJava {
@@ -10,7 +10,9 @@ subprojects {
     repositories {
         mavenCentral()
     }
+}
 
+subprojects {
     ext {
         slf4j_version  = '1.7.21'
         spring_version = '4.2.5.RELEASE'
@@ -33,6 +35,9 @@ subprojects {
 
         /* Components */
         compile (group: 'org.projectlombok', name: 'lombok', version: '1.16.16')
+
+        /* Test */
+        testCompile (group: 'junit', name: 'junit', version: '4.12')
     }
 
     task copyDep(type: Copy) {
@@ -44,3 +49,23 @@ subprojects {
         delete 'libs'
     }
 }
+
+task runApp(type: JavaExec) {
+    main = 'mc.core.Main'
+
+    workingDir = (project.hasProperty("workDir") ? project.workDir : '.')
+
+    subprojects.findAll().each{ prj ->
+        classpath += prj.sourceSets.main.runtimeClasspath
+    }
+    /* Uncomment, if your Log Implements are folder '{workDir}/log-impl' */
+    //classpath += files(fileTree(dir: new File(workingDir, "log-impl")))
+
+    /* Uncomment, if you used VM args */
+    //jvmArgs = [
+    //        "-DspringConfig=app.xml",
+    //        "-Dlog4j.configurationFile=log4j2.xml"
+    //]
+
+    ignoreExitValue = true
+}

core/src/main/java/mc/core/Location.java

@@ -6,18 +6,21 @@ package mc.core;
 
 import lombok.Getter;
 import lombok.Setter;
+import mc.core.exception.ResourceUnloadedException;
 import mc.core.world.World;
+import mc.core.world.chunk.Chunk;
 
 import java.io.Serializable;
+import java.lang.ref.Reference;
 import java.lang.ref.WeakReference;
 
 public class Location implements Serializable, Cloneable {
     @Getter
     @Setter
     private double x, y, z;
-    private WeakReference<World> refWorld;
+    private Reference<World> refWorld;
 
-    public Location(double x, double y, double z, World world) {
+    public Location (double x, double y, double z, World world) {
         setXYZ(x, y, z);
         setWorld(world);
     }
@@ -33,10 +36,16 @@ public class Location implements Serializable, Cloneable {
     }
 
     public World getWorld() {
+        if (refWorld == null) {
+            return null;
+        } else if (refWorld.get() == null) {
+            throw new ResourceUnloadedException("You're trying to get unloaded world");
+        } else {
             return refWorld.get();
         }
+    }
 
-    public void setWorld(World world) {
+    public void setWorld (World world) {
         this.refWorld = new WeakReference<>(world);
     }
 
@@ -52,11 +61,22 @@ public class Location implements Serializable, Cloneable {
         return (int) z;
     }
 
+    public Chunk getChunk() {
+        World world;
+        if ((world = getWorld()) == null) {
+            return null;
+        } else {
+            return world.getRegion((int) (x / 256), (int) (z / 256))
+                    .getChunk((int) ((x % 256) / 16), (int) ((z % 256) / 16));
+        }
+    }
+
     @Override
     public Location clone() {
         try {
             return (Location) super.clone();
         } catch (CloneNotSupportedException e) { // такое в нашем случае вообще возможно?
+            e.printStackTrace();
             return null;
         }
     }

core/src/main/java/mc/core/exception/McCoreUncheckedException.java

@@ -0,0 +1,12 @@
+package mc.core.exception;
+
+public abstract class McCoreUncheckedException extends RuntimeException {
+
+    public McCoreUncheckedException() {
+        super();
+    }
+
+    public McCoreUncheckedException(String msg) {
+        super(msg);
+    }
+}

core/src/main/java/mc/core/exception/ResourceUnloadedException.java

@@ -0,0 +1,8 @@
+package mc.core.exception;
+
+public class ResourceUnloadedException extends McCoreUncheckedException {
+
+    public ResourceUnloadedException(String msg) {
+        super(msg);
+    }
+}

core/src/main/java/mc/core/serialization/IChunkReader.java

@@ -1,10 +1,10 @@
 package mc.core.serialization;
 
-import mc.core.world.chunk.Chunk;
+import mc.core.world.ChunkSection;
 import mc.core.world.Region;
 
 import java.io.IOException;
 
 public interface IChunkReader {
-    Chunk read (Region region, int x, int y, int z) throws IOException;
+    ChunkSection read (Region region, int x, int y, int z) throws IOException;
 }

core/src/main/java/mc/core/world/ChunkSection.java

@@ -0,0 +1,45 @@
+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-04-15
+ */
+package mc.core.world;
+
+import mc.core.world.block.Block;
+
+import java.io.Serializable;
+
+/**
+ * Serialization chunk info
+ *
+ * +-------------+----------------+------------+
+ * | param       | range          | bits       |
+ * +-------------+----------------+------------+
+ * | blocks      | array          | 24*count   |
+ * +-------------+----------------+------------+
+ *
+ * Total: 24 * block_count bits (3 * block_count bytes)
+ * Max size: 12288 bytes (~12 Kb per chunk)
+ *
+ */
+/* 16x16x16 */
+public interface ChunkSection extends Serializable{
+
+    int getSkyLight(int x, int y, int z);
+    void setSkyLight(int x, int y, int z, int lightLevel);
+
+    int getAddition(int x, int y, int z);
+    void setAddition(int x, int y, int z, int value);
+
+    Biome getBiome(int x, int z);
+    void setBiome(int x, int z, Biome biome);
+
+    int getX();
+    int getY();
+    int getZ();
+
+    void setBlock(Block block);
+    Block getBlock(int x, int y, int z);
+
+    Region getRegion();
+    World getWorld();
+}

core/src/main/java/mc/core/world/Region.java

@@ -22,8 +22,13 @@ import java.io.Serializable;
  *
  */
 public interface Region extends Serializable{
-    Chunk getChunkAt(int x, int y, int z);
+    Chunk getChunk (int x, int z);
-    void setChunk(int x, int y, int z, Chunk chunk);
+    void setChunk(int x, int z, Chunk chunk);
+
+    @Deprecated
+    ChunkSection getChunkAt(int x, int y, int z);
+    @Deprecated
+    void setChunk(int x, int y, int z, ChunkSection chunkSection);
 
     int getX();
     int getZ();
@@ -31,5 +36,7 @@ public interface Region extends Serializable{
     Biome getBiomeAt (int x, int z);
     void setBiome (int x, int z, Biome biome);
 
-    void save(Serializer<Chunk> chunkSerializer, IRegionReaderWriter regionReaderWritter) throws IOException;
+    World getWorld();
+
+    void save(Serializer<ChunkSection> chunkSerializer, IRegionReaderWriter regionReaderWritter) throws IOException;
 }

core/src/main/java/mc/core/world/World.java

@@ -6,7 +6,6 @@ package mc.core.world;
 
 import mc.core.EntityLocation;
 import mc.core.nbt.Taggable;
-import mc.core.world.chunk.Chunk;
 
 import java.io.Serializable;
 import java.util.UUID;
@@ -49,8 +48,8 @@ public interface World extends Taggable, Serializable{
     EntityLocation getSpawn();
     void setSpawn(EntityLocation location);
 
-    Chunk getChunk(int x, int y, int z);
+    ChunkSection getChunk(int x, int y, int z);
-    void setChunk(int x, int y, int z, Chunk chunk);
+    void setChunk(int x, int y, int z, ChunkSection chunkSection);
 
     Region getRegion(int x, int z);
     void setRegion(int x, int z, Region region);

core/src/main/java/mc/core/world/chunk/Chunk.java

@@ -1,46 +1,16 @@
-/*
- * DmitriyMX <dimon550@gmail.com>
- * 2018-04-15
- */
 package mc.core.world.chunk;
 
-import mc.core.Location;
+import mc.core.world.ChunkSection;
-import mc.core.world.Biome;
+import mc.core.world.Region;
-import mc.core.world.block.Block;
+import mc.core.world.World;
 
-import java.io.Serializable;
+public interface Chunk {
 
-/**
+    World getWorld();
- * Serialization chunk info
+    ChunkSection getChunkSection(int height);
- *
+    ChunkSection setChunkSection(int height, ChunkSection chunkSection);
- * +-------------+----------------+------------+
+    Region getRegion();
- * | param       | range          | bits       |
- * +-------------+----------------+------------+
- * | blocks      | array          | 24*count   |
- * +-------------+----------------+------------+
- *
- * Total: 24 * block_count bits (3 * block_count bytes)
- * Max size: 12288 bytes (~12 Kb per chunk)
- *
- */
-/* 16x16x16 */
-public interface Chunk extends Serializable{
-    Block getBlock(int x, int y, int z);
-    default Block getBlock(Location location) {
-        return getBlock(location.getBlockX(), location.getBlockY(), location.getBlockZ());
-    }
-    void setBlock(Block block);
-
-    int getSkyLight(int x, int y, int z);
-    void setSkyLight(int x, int y, int z, int lightLevel);
-
-    int getAddition(int x, int y, int z);
-    void setAddition(int x, int y, int z, int value);
-
-    Biome getBiome(int x, int z);
-    void setBiome(int x, int z, Biome biome);
 
     int getX();
-    int getY();
     int getZ();
 }

core/src/main/java/mc/core/world/chunk/ChunkLoader.java

@@ -1,5 +1,7 @@
 package mc.core.world.chunk;
 
+import mc.core.world.ChunkSection;
+
 import java.util.Optional;
 
 public interface ChunkLoader {
@@ -12,7 +14,7 @@ public interface ChunkLoader {
      * @param z chunk position
      * @return optional of chunk (nullable)
      */
-    Optional<Chunk> loadChunk (int x, int y, int z);
+    Optional<ChunkSection> loadChunk (int x, int y, int z);
 
     /**
      *  Tries to load chunk like {@link #loadChunk(int, int, int)}
@@ -23,5 +25,5 @@ public interface ChunkLoader {
      * @param z chunk position
      * @return chunk
      */
-    Chunk loadOrGenerateChunk (int x, int y, int z);
+    ChunkSection loadOrGenerateChunk (int x, int y, int z);
 }

event-loop/TODO

@@ -0,0 +1,7 @@
+- Система иерархических блокировок ресурсов (чанки в мире)
+    - Нужно что-то делать с подгрузкой отсутсвующих чанков для таких блокировок
+- Возможность вызвать событие из EventHandler
+- Performance Monitor
+- Возможная проблема с переполнением очереди при спаме пакетами от игрока
+- Добавить поля с замками для ресурсов (Player, World, Chunk)
+- Time Scheduler

event-loop/build.gradle

@@ -0,0 +1,15 @@
+group 'mc'
+version '1.0-SNAPSHOT'
+
+dependencies {
+    /* Core */
+    compile_excludeCopy project(':core')
+
+    testCompile group: 'org.slf4j', name: 'slf4j-simple', version: '1.6.1'
+    testCompile group: 'com.carrotsearch', name: 'junit-benchmarks', version: '0.7.0'
+}
+
+
+test {
+    exclude "ru/core/events/*Benchmark.class"
+}

event-loop/src/main/java/mc/core/events/EventPipelineTask.java

@@ -0,0 +1,113 @@
+package mc.core.events;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import mc.core.events.api.EventQueueOwner;
+import mc.core.events.api.LockableResource;
+import mc.core.events.runner.lock.LockObserveList;
+import mc.core.events.runner.ResourceAwareExecutorService;
+import mc.core.events.runner.ResourceAwareRunnable;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.List;
+
+/**
+ * Holds processing pipeline for every event
+ * that enters {@link FullAsyncEventLoop}.
+ * <p>
+ * Ensures that EventHandlers will never be called in a wrong
+ * order by feeding only one task at a time to the {@link ResourceAwareExecutorService}
+ */
+@RequiredArgsConstructor
+@Getter
+@Slf4j
+public class EventPipelineTask {
+    private final ResourceAwareExecutorService service;
+    private final List<RegisteredEventHandler> handlers;
+    private final FullAsyncEventLoop manager;
+    private final Event event;
+    private final EventQueueOwner owner;
+    private int currentIndex = 0;
+    @Setter
+    private PipelineState state = PipelineState.IDLE;
+
+    public void next() {
+        if (updatePipelineState()) return;
+
+        RegisteredEventHandler handler = handlers.get(currentIndex);
+        // If event has been already cancelled and current handler
+        // ignores cancelled events
+        if (event.isCanceled() && handler.isIgnoreCancelled()) {
+            // Just skip current event handler
+            currentIndex++;
+            next();
+        } else {
+            feedTask(handler);
+        }
+    }
+
+    /**
+     * Update current pipeline status
+     *
+     * @return true if pipeline has been completed
+     */
+    private boolean updatePipelineState() {
+        if (state == PipelineState.IDLE) {
+            state = PipelineState.WORKING;
+        }
+        if (currentIndex >= handlers.size() && state == PipelineState.WORKING) {
+            state = PipelineState.FINISHED;
+            manager.update(owner);
+            return true;
+        }
+
+        if (state == PipelineState.FINISHED) {
+            throw new IllegalStateException("Attempted to call next step on a FINISHED pipeline");
+        }
+        return false;
+    }
+
+    private void feedTask(RegisteredEventHandler handler) {
+        LockObserveList locks = getLocks(handler);
+        service.addTask(new ResourceAwareRunnable() {
+            @Override
+            public void run() {
+                try {
+                    handler.getMethod().invoke(handler.getObject(), event);
+                } catch (IllegalAccessException | InvocationTargetException e) {
+                    log.error("Unable to dispatch event " + event.getClass().getSimpleName() + " to handler " + event.getClass().getName(), e);
+                }
+            }
+
+            @Override
+            public void after() {
+                currentIndex++;
+                next();
+            }
+
+            @Override
+            public LockObserveList getLocks() {
+                return locks;
+            }
+        });
+    }
+
+    private LockObserveList getLocks(RegisteredEventHandler handler) {
+        LockObserveList locks = new LockObserveList();
+
+        if (handler.isPluginSynchronize())
+            locks.add(manager.getResourceManager().getPluginLock(handler.getPlugin()));
+
+        for (LockableResource resource : handler.getLock()) {
+            locks.addAll(manager.getResourceManager().getAnnotationLocks(resource, event));
+        }
+
+        return locks;
+    }
+
+    public enum PipelineState {
+        IDLE, WORKING, FINISHED
+    }
+}

event-loop/src/main/java/mc/core/events/FullAsyncEventLoop.java

@@ -0,0 +1,121 @@
+package mc.core.events;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import mc.core.events.api.EventHandler;
+import mc.core.events.api.EventQueueOwner;
+import mc.core.events.api.Plugin;
+import mc.core.events.runner.ResourceAwareExecutorService;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Event loop core. Manages event handler registration process,
+ * maintains event queues.
+ * <p>
+ * This event loop guarantees that events, assigned to the {@link EventQueueOwner}
+ * will be handler in order of scheduling
+ */
+@Slf4j
+public class FullAsyncEventLoop {
+    // Item leaves this queue only when EventPipeline is fully executed
+    private Map<EventQueueOwner, Queue<EventPipelineTask>> eventQueue = new ConcurrentHashMap<>();
+    private Map<Class<? extends Event>, List<RegisteredEventHandler>> registeredHandlers = new HashMap<>();
+    @SuppressWarnings("SpringJavaAutowiredMembersInspection")
+    @Autowired
+    @Setter
+    private ResourceAwareExecutorService resourceAwareExecutorService;
+    @Getter
+    private SharedResourceManager resourceManager = new SharedResourceManager();
+
+    public void addEventHandler(Plugin plugin, Object object) {
+        Map<Method, EventHandler> candidates = getEventHandlerCandidates(object);
+
+        for (Map.Entry<Method, EventHandler> pair : candidates.entrySet()) {
+            @SuppressWarnings("unchecked") Class<? extends Event> eventType = (Class<? extends Event>) pair.getKey().getParameterTypes()[0];
+            List<RegisteredEventHandler> handlers = this.registeredHandlers.computeIfAbsent(eventType, e -> new ArrayList<>());
+            handlers.add(new RegisteredEventHandler(plugin, object, pair.getKey(), pair.getValue().lock(), pair.getValue().pluginSynchronize(), pair.getValue().priority().getValue(), pair.getValue().ignoreCancelled()));
+            handlers.sort(Comparator.comparingInt(RegisteredEventHandler::getPriority));
+        }
+    }
+
+    public List<RegisteredEventHandler> getPipelineForEvent(Event event) {
+        return registeredHandlers.get(event.getClass());
+    }
+
+    private Map<Method, EventHandler> getEventHandlerCandidates(Object object) {
+        Map<Method, EventHandler> candidates;
+        candidates = new HashMap<>();
+        for (Method method : object.getClass().getDeclaredMethods()) {
+            EventHandler annotation = method.getAnnotation(EventHandler.class);
+            if (annotation == null)
+                continue;
+
+            if (!Modifier.isPublic(method.getModifiers())) {
+                log.error("Unable to register {} as an EventHandler. Method must have a 'public' access modifier.", method.toString());
+                continue;
+
+            }
+
+            if (method.getParameterCount() != 1) {
+                log.error("Unable to register {} as an EventHandler. Method must have exactly one argument.", method.toString());
+                continue;
+            }
+
+            Class<?> firstParamType = method.getParameterTypes()[0];
+            if (!Event.class.isAssignableFrom(firstParamType)) {
+                log.error("Unable to register {} as an EventHandler. First parameter type must implement 'Event' interface.", method.toString());
+                continue;
+            }
+
+            method.setAccessible(true);
+            candidates.put(method, annotation);
+        }
+        return candidates;
+    }
+
+    public void asyncFireEvent(EventQueueOwner owner, Event event) {
+        List<RegisteredEventHandler> handlers = getPipelineForEvent(event);
+        if (handlers == null)
+            return;
+
+        Queue<EventPipelineTask> queue = eventQueue.computeIfAbsent(owner, s -> new ArrayDeque<>());
+        queue.add(new EventPipelineTask(resourceAwareExecutorService, handlers, this, event, owner));
+        update(owner);
+    }
+
+    /**
+     * Updates queue state for a given owner:
+     * <p>
+     * - Removes first element of a queue if it is marked as FINISHED
+     * - Starts executing first pipeline from the queue if it is marked with IDLE
+     *
+     * @param owner queue owner
+     */
+    public synchronized void update(EventQueueOwner owner) {
+        if (!eventQueue.containsKey(owner)) {
+            log.warn("Unable to update pipeline executor: unable to find queue");
+            return;
+        }
+        Queue<EventPipelineTask> queue = eventQueue.get(owner);
+        if (queue.isEmpty()) {
+            log.warn("Unable to update pipeline executor: queue is empty");
+            return;
+        }
+
+        if (queue.peek().getState() == EventPipelineTask.PipelineState.FINISHED) {
+            queue.poll();
+        }
+
+        EventPipelineTask pipeline;
+        if ((pipeline = queue.peek()) != null
+                && pipeline.getState() == EventPipelineTask.PipelineState.IDLE) {
+            pipeline.next();
+        }
+    }
+}

event-loop/src/main/java/mc/core/events/RegisteredEventHandler.java

@@ -0,0 +1,24 @@
+package mc.core.events;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import mc.core.events.api.LockableResource;
+import mc.core.events.api.Plugin;
+
+import java.lang.reflect.Method;
+
+/**
+ * Holds all the information necessary to register an
+ * event handler in an event loop
+ */
+@RequiredArgsConstructor
+@Getter
+public class RegisteredEventHandler {
+    private final Plugin plugin;
+    private final Object object;
+    private final Method method;
+    private final LockableResource[] lock;
+    private final boolean pluginSynchronize;
+    private final int priority;
+    private final boolean ignoreCancelled;
+}

event-loop/src/main/java/mc/core/events/SharedResourceManager.java

@@ -0,0 +1,64 @@
+package mc.core.events;
+
+import lombok.extern.slf4j.Slf4j;
+import mc.core.Location;
+import mc.core.events.api.LockableResource;
+import mc.core.events.api.Plugin;
+import mc.core.events.api.interfaces.LocationProvidingEvent;
+import mc.core.events.api.interfaces.PlayerProvidingEvent;
+import mc.core.events.api.interfaces.WorldProvidingEvent;
+import mc.core.events.runner.lock.PoorMansLock;
+import mc.core.player.Player;
+import mc.core.world.World;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+@Slf4j
+public class SharedResourceManager {
+    private Map<Plugin, PoorMansLock> pluginLocks = new ConcurrentHashMap<>();
+    // TODO: Memory leak HERE. Fix with introducing field to Player class
+    private Map<Player, PoorMansLock> playerLocks = new ConcurrentHashMap<>();
+    // TODO: Memory leak HERE. Fix with introducing field to World class
+    private Map<World, PoorMansLock> worldLocks = new ConcurrentHashMap<>();
+
+    public PoorMansLock getPluginLock(Plugin plugin) {
+        return pluginLocks.computeIfAbsent(plugin, s -> new PoorMansLock());
+    }
+
+    public PoorMansLock getPlayerLock(Player player) {
+        return playerLocks.computeIfAbsent(player, s -> new PoorMansLock());
+    }
+
+    public PoorMansLock getWorldLock(World world) {
+        return worldLocks.computeIfAbsent(world, s -> new PoorMansLock());
+    }
+
+    private <T> T require(LockableResource resource, Event event, Class<T> inter) {
+        if (inter.isInstance(event)) {
+            //noinspection unchecked
+            return (T) event;
+        } else
+            throw new IllegalArgumentException("Unable to lock " + resource + " while attempting to process event. Event " + event.getClass().getSimpleName() + " must implement " + inter);
+    }
+
+    public Collection<PoorMansLock> getAnnotationLocks(LockableResource resource, Event event) {
+        switch (resource) {
+            case PLAYER:
+                return require(resource, event, PlayerProvidingEvent.class).getAssociatedPlayers().stream().map(this::getPlayerLock).collect(Collectors.toList());
+            case PLAYER_WORLD:
+                return require(resource, event, PlayerProvidingEvent.class).getAssociatedPlayers().stream().map(s -> s.getLocation().getWorld()).map(this::getWorldLock).collect(Collectors.toList());
+            case EVENT_LOCATION_WORLD:
+                return require(resource, event, LocationProvidingEvent.class).getAssociatedLocations().stream().map(Location::getWorld).map(this::getWorldLock).collect(Collectors.toList());
+            case EVENT_WORLD:
+                return require(resource, event, WorldProvidingEvent.class).getAssociatedWorlds().stream().map(this::getWorldLock).collect(Collectors.toList());
+            default:
+                log.warn("Unable to find action for " + resource + " resource definition.");
+                return Collections.emptyList();
+        }
+    }
+
+}

event-loop/src/main/java/mc/core/events/api/EventHandler.java

@@ -0,0 +1,17 @@
+package mc.core.events.api;
+
+import java.lang.annotation.*;
+
+@Documented
+@Target(ElementType.METHOD)
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+public @interface EventHandler {
+    EventPriority priority() default EventPriority.NORMAL;
+
+    boolean ignoreCancelled() default false;
+
+    boolean pluginSynchronize() default true;
+
+    LockableResource[] lock() default {};
+}

event-loop/src/main/java/mc/core/events/api/EventPriority.java

@@ -0,0 +1,19 @@
+package mc.core.events.api;
+
+import lombok.Getter;
+
+public enum EventPriority {
+    LOWEST(0),
+    LOW(1),
+    NORMAL(2),
+    HIGH(3),
+    HIGHEST(4),
+    MONITOR(5);
+
+    @Getter
+    private int value;
+
+    EventPriority(int value) {
+        this.value = value;
+    }
+}

event-loop/src/main/java/mc/core/events/api/EventQueueOwner.java

@@ -0,0 +1,4 @@
+package mc.core.events.api;
+
+public interface EventQueueOwner {
+}

event-loop/src/main/java/mc/core/events/api/LockableResource.java

@@ -0,0 +1,10 @@
+package mc.core.events.api;
+
+public enum LockableResource {
+    PLAYER,
+    PLAYER_WORLD,
+    EVENT_LOCATION_WORLD,
+    EVENT_WORLD
+
+    // TODO: Add entity-related constants
+}

event-loop/src/main/java/mc/core/events/api/Plugin.java

@@ -0,0 +1,4 @@
+package mc.core.events.api;
+
+public interface Plugin {
+}

event-loop/src/main/java/mc/core/events/api/interfaces/LocationProvidingEvent.java

@@ -0,0 +1,9 @@
+package mc.core.events.api.interfaces;
+
+import mc.core.Location;
+
+import java.util.Collection;
+
+public interface LocationProvidingEvent {
+    Collection<Location> getAssociatedLocations();
+}

event-loop/src/main/java/mc/core/events/api/interfaces/PlayerProvidingEvent.java

@@ -0,0 +1,21 @@
+package mc.core.events.api.interfaces;
+
+import mc.core.Location;
+import mc.core.player.Player;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public interface PlayerProvidingEvent extends LocationProvidingEvent {
+    List<Player> getAssociatedPlayers();
+
+    @Override
+    default Collection<Location> getAssociatedLocations() {
+        List<Player> players = getAssociatedPlayers();
+        if (players.size() == 1)
+            return Collections.singletonList(players.get(0).getLocation());
+        else
+            throw new RuntimeException("This method is not implemented.");
+    }
+}

event-loop/src/main/java/mc/core/events/api/interfaces/WorldProvidingEvent.java

@@ -0,0 +1,10 @@
+package mc.core.events.api.interfaces;
+
+import mc.core.world.World;
+
+import java.util.Collection;
+
+public interface WorldProvidingEvent {
+    Collection<World> getAssociatedWorlds();
+
+}

event-loop/src/main/java/mc/core/events/api/samples/BlockBreakEvent.java

@@ -0,0 +1,31 @@
+package mc.core.events.api.samples;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import mc.core.Location;
+import mc.core.events.EventBase;
+import mc.core.events.api.interfaces.LocationProvidingEvent;
+import mc.core.events.api.interfaces.PlayerProvidingEvent;
+import mc.core.player.Player;
+import mc.core.world.block.Block;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+@RequiredArgsConstructor
+@Getter
+public class BlockBreakEvent extends EventBase implements PlayerProvidingEvent, LocationProvidingEvent {
+    private final Player player;
+    private final Block block;
+
+    @Override
+    public List<Player> getAssociatedPlayers() {
+        return Collections.singletonList(player);
+    }
+
+    @Override
+    public Collection<Location> getAssociatedLocations() {
+        return Collections.singletonList(block.getLocation());
+    }
+}

event-loop/src/main/java/mc/core/events/runner/AllInScheduleStrategy.java

@@ -0,0 +1,59 @@
+package mc.core.events.runner;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.CountDownLatch;
+
+/**
+ * Simple scheduling strategy.
+ * <p>
+ * We wait until the first task in a queue will be able to acquire all
+ * the necessary resources and then we schedule it for execution
+ */
+public class AllInScheduleStrategy implements ScheduleStrategy {
+    private BlockingQueue<ResourceAwareRunnable> globalQueue;
+    private ResourceAwareExecutorService resourceAwareExecutorService;
+
+    public AllInScheduleStrategy(ResourceAwareExecutorService resourceAwareExecutorService) {
+        this.globalQueue = resourceAwareExecutorService.queue;
+        this.resourceAwareExecutorService = resourceAwareExecutorService;
+    }
+
+
+    @Override
+    public synchronized ResourceAwareRunnable getTask() throws InterruptedException {
+        waitForResourceLockComplete();
+
+        // Wait for new task in queue
+        ResourceAwareRunnable runnable = globalQueue.take();
+        while (!runnable.getLocks().isReady()) {
+            CountDownLatch latch = new CountDownLatch(1);
+            runnable.getLocks().setCallback(latch::countDown);
+            // Prevent situations where dependencies were resolved
+            // while we were setting up the callback
+            if (runnable.getLocks().isReady())
+                continue;
+            latch.await();
+        }
+
+        // Lock execution for the next thread
+        // (wait until resources for previous task will be blocked)
+        resourceAwareExecutorService.waitForLock.set(true);
+        return runnable;
+    }
+
+    /**
+     * Waits until the last scheduled task will lock all the necessary resources.
+     * <p>
+     * It is required to avoid race-condition when an execution candidate task (first task in a queue)
+     * skips lock-await procedure due to the last scheduled task not having locked necessary resources yet.
+     *
+     * @throws InterruptedException if current thread is interrupted
+     */
+    private void waitForResourceLockComplete() throws InterruptedException {
+        synchronized (resourceAwareExecutorService.waitForLock) {
+            while (resourceAwareExecutorService.waitForLock.get()) {
+                resourceAwareExecutorService.wait();
+            }
+        }
+    }
+}

event-loop/src/main/java/mc/core/events/runner/ExecutorWorkerThread.java

@@ -0,0 +1,55 @@
+package mc.core.events.runner;
+
+/**
+ * Worker thread for {@link ResourceAwareExecutorService}.
+ * <p>
+ * - Awaits for tasks from {@link ScheduleStrategy}
+ * - Locks up resources for this task
+ * - Notifies {@link ScheduleStrategy} when resource-locking procedure is complete
+ * - Executes the runnable in this thread
+ * - Unlocks all the resources
+ * - Calls {@link ResourceAwareRunnable#after()} callback
+ */
+public class ExecutorWorkerThread extends Thread {
+    private ResourceAwareExecutorService service;
+
+    public ExecutorWorkerThread(String name, ResourceAwareExecutorService service) {
+        super(name);
+        this.service = service;
+    }
+
+    @Override
+    public void run() {
+        while (!isInterrupted() && isAlive()) {
+            ResourceAwareRunnable runnable;
+            try {
+                runnable = service.getStrategy().getTask();
+            } catch (InterruptedException e) {
+                return;
+            }
+
+            executeTask(runnable);
+        }
+    }
+
+    void executeTask(ResourceAwareRunnable runnable) {
+        runnable.getLocks().lockAll();
+        notifyLockingDone();
+        try {
+            runnable.run();
+        } finally {
+            runnable.getLocks().unlockAll();
+            runnable.getLocks().release();
+        }
+        runnable.after();
+    }
+
+    private void notifyLockingDone() {
+        synchronized (service.waitForLock) {
+            if (service.waitForLock.get()) {
+                service.waitForLock.set(false);
+                service.waitForLock.notifyAll();
+            }
+        }
+    }
+}

event-loop/src/main/java/mc/core/events/runner/ResourceAwareExecutorService.java

@@ -0,0 +1,74 @@
+package mc.core.events.runner;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+
+/**
+ * Custom implementation of an ExecutorService.
+ *
+ * Holds a queue of {@link ResourceAwareRunnable} and executes them in a thread pool.
+ *
+ * Warning! This class doesn't guarantee, that tasks will be executed in any specific order.
+ * In fact, it's up to {@link ScheduleStrategy} to decide which task will be scheduled for
+ * execution next.
+ */
+public class ResourceAwareExecutorService {
+    private static final boolean WORKER_INSTANT_EXECUTE = false;
+    BlockingQueue<ResourceAwareRunnable> queue = new ArrayBlockingQueue<>(100);
+    // A synchronize aid, that prevents ScheduleStrategy from returning
+    // wrong tasks when executor is late in blocking resources
+    final AtomicBoolean waitForLock = new AtomicBoolean(false);
+    private ScheduleStrategy strategy = new AllInScheduleStrategy(this);
+    private Set<Thread> executorThreads = new HashSet<>();
+    private int threadCount;
+
+    public ResourceAwareExecutorService(int threadCount) {
+        this.threadCount = threadCount;
+    }
+
+    public void start() {
+        if (executorThreads.size() > 0)
+            throw new RuntimeException("This executor service was already started.");
+
+        for (int i = 0; i < threadCount; i++) {
+            Thread thread = new ExecutorWorkerThread("Event Loop #" + i, this);
+            executorThreads.add(thread);
+            thread.start();
+        }
+    }
+
+    public void stop() {
+        if (executorThreads.size() == 0)
+            throw new RuntimeException("This executor service was not initialized yet.");
+
+        Iterator<Thread> iterator = executorThreads.iterator();
+        while (iterator.hasNext()) {
+            Thread thread = iterator.next();
+            thread.interrupt();
+            iterator.remove();
+        }
+    }
+
+    public void addTask(ResourceAwareRunnable task) {
+        if (WORKER_INSTANT_EXECUTE && Thread.currentThread() instanceof ExecutorWorkerThread) {
+            ((ExecutorWorkerThread) Thread.currentThread()).executeTask(task);
+        } else
+            queue.offer(task);
+    }
+
+
+    public ScheduleStrategy getStrategy() {
+        return strategy;
+    }
+
+    private class DefaultScheduleStrategy implements ScheduleStrategy {
+        public ResourceAwareRunnable getTask() throws InterruptedException {
+            return queue.take();
+        }
+    }
+}

event-loop/src/main/java/mc/core/events/runner/ResourceAwareRunnable.java

@@ -0,0 +1,13 @@
+package mc.core.events.runner;
+
+import mc.core.events.runner.lock.LockObserveList;
+
+public interface ResourceAwareRunnable extends Runnable {
+    default LockObserveList getLocks() {
+        return LockObserveList.EMPTY_LIST;
+    }
+
+    default void after() {
+
+    }
+}

event-loop/src/main/java/mc/core/events/runner/ScheduleStrategy.java

@@ -0,0 +1,5 @@
+package mc.core.events.runner;
+
+public interface ScheduleStrategy {
+    ResourceAwareRunnable getTask() throws InterruptedException;
+}

event-loop/src/main/java/mc/core/events/runner/lock/LockObserveList.java

@@ -0,0 +1,61 @@
+package mc.core.events.runner.lock;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+
+public class LockObserveList implements Consumer<PoorMansLock> {
+    public static LockObserveList EMPTY_LIST = new LockObserveList();
+    private List<PoorMansLock> locks = new ArrayList<>();
+    private Runnable callback;
+
+    public void setCallback(Runnable callback) {
+        this.callback = callback;
+    }
+
+    public void add(PoorMansLock lock) {
+        locks.add(lock);
+        lock.addCallback(this);
+    }
+
+    public void addAll(Iterable<PoorMansLock> locks) {
+        for (PoorMansLock lock : locks)
+            add(lock);
+    }
+
+    public void release() {
+        callback = null;
+        for (PoorMansLock lock : locks) {
+            lock.removeCallback(this);
+        }
+        locks.clear();
+    }
+
+    public boolean isReady() {
+        for (PoorMansLock lock : locks) {
+            if (lock.isLocked())
+                return false;
+        }
+        return true;
+    }
+
+    public void lockAll() {
+        for (PoorMansLock lock : locks)
+            lock.lock();
+    }
+
+    public void unlockAll() {
+        for (PoorMansLock lock : locks)
+            lock.unlock();
+    }
+
+    @Override
+    public void accept(PoorMansLock lock) {
+        if (!lock.isLocked()) {
+            if (isReady()) {
+                if (callback != null)
+                    callback.run();
+            }
+        }
+    }
+}

event-loop/src/main/java/mc/core/events/runner/lock/PoorMansLock.java

@@ -0,0 +1,52 @@
+package mc.core.events.runner.lock;
+
+import java.util.Set;
+import java.util.concurrent.CopyOnWriteArraySet;
+import java.util.function.Consumer;
+
+public class PoorMansLock {
+    private Thread owner = null;
+    private Set<Consumer<PoorMansLock>> callbacks = new CopyOnWriteArraySet<>();
+
+    public void addCallback(Consumer<PoorMansLock> callback) {
+        callbacks.add(callback);
+    }
+
+    public void removeCallback(Consumer<PoorMansLock> callback) {
+        callbacks.remove(callback);
+    }
+
+
+    public boolean isLocked() {
+        return owner != null;
+    }
+
+    private void triggerUpdate() {
+        for (Consumer<PoorMansLock> consumer : callbacks)
+            consumer.accept(this);
+    }
+
+    public synchronized void lock() {
+        if(owner == Thread.currentThread())
+            return;
+
+        if (owner != null) {
+            throw new RuntimeException("Unable to lock this resource: already in use");
+        }
+
+        owner = Thread.currentThread();
+        triggerUpdate();
+    }
+
+    public synchronized void unlock() {
+        if (owner == null)
+            return;
+
+        if (owner != Thread.currentThread()) {
+            throw new RuntimeException("Attempt to unlock resource from non-owning thread");
+        }
+
+        owner = null;
+        triggerUpdate();
+    }
+}

event-loop/src/main/java/mc/core/timings/ThreadTimings.java

@@ -0,0 +1,45 @@
+package mc.core.timings;
+
+import java.util.Stack;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class ThreadTimings {
+    private static AtomicInteger IDS = new AtomicInteger();
+    private int threadId;
+    private Stack<Timings> stack = new Stack<>();
+
+    public ThreadTimings() {
+        this.threadId = IDS.getAndIncrement();
+    }
+
+    public Stack<Timings> getStack() {
+        return stack;
+    }
+
+    public int getThreadId() {
+        return threadId;
+    }
+
+    public Timings start() {
+        Timings timings = new Timings(this, stack.size());
+        getTimingsManager().waitForTimingsInitialize();
+        stack.push(timings);
+        getTimingsManager().notifyTimings(this, timings, true);
+        return timings;
+    }
+
+    private TimingsManager getTimingsManager() {
+        return Timings.getTimingsManager();
+    }
+
+    public void end(Timings finished) {
+        Timings timings = null;
+        while (!stack.isEmpty() && timings != finished) {
+            getTimingsManager().waitForTimingsInitialize();
+            timings = stack.pop();
+            if (!timings.hasFinished())
+                timings.finish();
+            getTimingsManager().notifyTimings(this, timings, false);
+        }
+    }
+}

event-loop/src/main/java/mc/core/timings/Timings.java

@@ -0,0 +1,51 @@
+package mc.core.timings;
+
+public class Timings implements AutoCloseable {
+    private ThreadTimings threadTimings;
+    private long acquireTime;
+    @SuppressWarnings("FieldCanBeLocal")
+    private long endTime = -1;
+    private int id;
+
+    public Timings(ThreadTimings threadTimings, int id) {
+        this.id = id;
+        this.threadTimings = threadTimings;
+        this.acquireTime = System.nanoTime();
+    }
+
+    public static Timings start() {
+        return TimingsStaticAccessor.getTimingsManager().getCurrentThreadTimings().start();
+    }
+
+    public static TimingsManager getTimingsManager() {
+        return TimingsStaticAccessor.getTimingsManager();
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public long getEndTime() {
+        return endTime;
+    }
+
+    public long getAcquireTime() {
+        return acquireTime;
+    }
+
+    public boolean hasFinished() {
+        return endTime != -1;
+    }
+
+    public void finish() {
+        if (hasFinished())
+            throw new IllegalStateException("This timing was already finished");
+        this.endTime = System.nanoTime();
+    }
+
+    @Override
+    public void close() {
+        finish();
+        this.threadTimings.end(this);
+    }
+}

event-loop/src/main/java/mc/core/timings/TimingsEventType.java

@@ -0,0 +1,17 @@
+package mc.core.timings;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum TimingsEventType {
+    TIMINGS_START((short) 0),
+    TIMINGS_END((short) 1),
+    TIMINGS_FILE_INITIALIZING((short) 2),
+    TIMINGS_FILE_INITIALIZED((short) 3),
+    TIMINGS_CHANGE_THREAD_OPTIONS((short) 4),
+    TIMINGS_FILE_END((short) 5);
+
+    @Getter
+    private final short id;
+}

event-loop/src/main/java/mc/core/timings/TimingsManager.java

@@ -0,0 +1,161 @@
+package mc.core.timings;
+
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import mc.core.timings.io.DefaultWriterFactory;
+import mc.core.timings.io.TimingsWriter;
+import mc.core.timings.io.TimingsWriterFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.locks.ReentrantLock;
+
+@Slf4j
+public class TimingsManager {
+    private final Map<Thread, ThreadTimings> threadTimings = new ConcurrentHashMap<>();
+    // These variables are essential in Timings thread synchronization
+    private final AtomicBoolean waitForFile = new AtomicBoolean(false);
+    private TimingsWriter writer;
+    private Thread timingsIoThread;
+    private CountDownLatch ioThreadStopMutex;
+    private BlockingQueue<TimingsRecord> queue;
+    private ReentrantLock queueAccessLock = new ReentrantLock();
+    // For modularity purposes
+    @Autowired
+    @Setter
+    private TimingsWriterFactory writerFactory = new DefaultWriterFactory();
+
+    public TimingsManager() {
+        TimingsStaticAccessor.TIMINGS_MANAGER = this;
+    }
+
+    public void startRecording(File file) {
+        synchronized (waitForFile) {
+            waitForFile.set(true);
+        }
+        try {
+            writer = writerFactory.newInstance(file);
+            writer.writeEvent(0, 0, System.nanoTime(), TimingsEventType.TIMINGS_FILE_INITIALIZING);
+            // Synchronize current thread state
+            for (Map.Entry<Thread, ThreadTimings> pair : threadTimings.entrySet()) {
+                writer.writeEvent(pair.getValue().getThreadId(), 0, System.nanoTime(), TimingsEventType.TIMINGS_CHANGE_THREAD_OPTIONS, "name: " + pair.getKey().getName());
+                for (Timings timings : pair.getValue().getStack()) {
+                    writer.writeEvent(pair.getValue().getThreadId(), timings.getId(), timings.getAcquireTime(), TimingsEventType.TIMINGS_START);
+                }
+            }
+            writer.writeEvent(0, 0, System.nanoTime(), TimingsEventType.TIMINGS_FILE_INITIALIZED);
+            queue = new ArrayBlockingQueue<>(200);
+            ioThreadStopMutex = new CountDownLatch(1);
+            timingsIoThread = new Thread() {
+                @Override
+                public void run() {
+                    try {
+                        while (!isInterrupted() && isAlive()) {
+                            TimingsRecord record;
+                            try {
+                                if (queue == null)
+                                    return;
+                                record = queue.take();
+                            } catch (InterruptedException e) {
+                                return;
+                            }
+                            record.writeToFile(writer);
+                        }
+                    } finally {
+                        ioThreadStopMutex.countDown();
+                    }
+                }
+            };
+            timingsIoThread.setName("Timings IO thread");
+            timingsIoThread.start();
+        } catch (Exception e) {
+            log.error("Unable to start timings recording", e);
+        }
+        synchronized (waitForFile) {
+            waitForFile.set(false);
+            waitForFile.notifyAll();
+        }
+    }
+
+    public void stopRecording() {
+        // Disable write queue
+        queueAccessLock.lock();
+        queue = null;
+        queueAccessLock.unlock();
+        // Interrupt thread and wait until in finished writing the last task
+        timingsIoThread.interrupt();
+        try {
+            ioThreadStopMutex.await();
+        } catch (InterruptedException e) {
+            log.error("Unable to wait until last record would be written to file", e);
+        }
+        // Write EOF event
+        writer.writeEvent(0, 0, System.nanoTime(), TimingsEventType.TIMINGS_FILE_END);
+        // Unload file
+        try {
+            writer.close();
+        } catch (IOException e) {
+            log.error("Unable to close timings file", e);
+        }
+        writer = null;
+    }
+
+    void notifyTimings(ThreadTimings thread, Timings timings, boolean start) {
+        if (queue == null)
+            return;
+        queueAccessLock.lock();
+        try {
+            if (queue != null)
+                queue.offer(
+                        new TimingsRecord(thread.getThreadId(),
+                                timings.getId(),
+                                start ? timings.getAcquireTime() : timings.getEndTime(),
+                                start ? TimingsEventType.TIMINGS_START : TimingsEventType.TIMINGS_END
+                        )
+                );
+        } finally {
+            queueAccessLock.unlock();
+        }
+    }
+
+    void waitForTimingsInitialize() {
+        synchronized (waitForFile) {
+            while (waitForFile.get()) {
+                try {
+                    waitForFile.wait();
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+
+    }
+
+    public ThreadTimings getCurrentThreadTimings() {
+
+        synchronized (this.threadTimings) {
+            if (this.threadTimings.containsKey(Thread.currentThread())) {
+                return this.threadTimings.get(Thread.currentThread());
+            } else {
+                ThreadTimings timings = new ThreadTimings();
+                this.threadTimings.put(Thread.currentThread(), timings);
+                if (queue != null) {
+                    try {
+                        writer.writeEvent(timings.getThreadId(), 0, System.nanoTime(), TimingsEventType.TIMINGS_CHANGE_THREAD_OPTIONS, "name: " + Thread.currentThread().getName());
+                    } catch (NullPointerException ignored) {
+                        // It means that there the file recording was stopped
+                        // we don't actually care about it
+                    }
+                }
+                return timings;
+            }
+        }
+    }
+}

event-loop/src/main/java/mc/core/timings/TimingsRecord.java

@@ -0,0 +1,33 @@
+package mc.core.timings;
+
+import mc.core.timings.io.TimingsWriter;
+
+class TimingsRecord {
+    private int threadId;
+    private int stackId;
+    private long time;
+    private TimingsEventType eventType;
+    private String data;
+
+    public TimingsRecord(int threadId, int stackId, long time, TimingsEventType eventType) {
+        this.threadId = threadId;
+        this.stackId = stackId;
+        this.time = time;
+        this.eventType = eventType;
+    }
+
+    public TimingsRecord(int threadId, int stackId, long time, TimingsEventType eventType, String data) {
+        this.threadId = threadId;
+        this.stackId = stackId;
+        this.time = time;
+        this.eventType = eventType;
+        this.data = data;
+    }
+
+    public void writeToFile(TimingsWriter fileWriter) {
+        if (data == null)
+            fileWriter.writeEvent(threadId, stackId, time, eventType);
+        else
+            fileWriter.writeEvent(threadId, stackId, time, eventType, data);
+    }
+}

event-loop/src/main/java/mc/core/timings/TimingsStaticAccessor.java

@@ -0,0 +1,9 @@
+package mc.core.timings;
+
+public class TimingsStaticAccessor {
+    static TimingsManager TIMINGS_MANAGER;
+
+    public static TimingsManager getTimingsManager() {
+        return TIMINGS_MANAGER != null ? TIMINGS_MANAGER : (TIMINGS_MANAGER = new TimingsManager());
+    }
+}

event-loop/src/main/java/mc/core/timings/io/DefaultWriterFactory.java

@@ -0,0 +1,11 @@
+package mc.core.timings.io;
+
+import java.io.File;
+import java.io.IOException;
+
+public class DefaultWriterFactory implements TimingsWriterFactory {
+    @Override
+    public TimingsWriter newInstance(File file) throws IOException {
+        return new TimingsFileWriter(file);
+    }
+}

event-loop/src/main/java/mc/core/timings/io/TimingsFileWriter.java

@@ -0,0 +1,63 @@
+package mc.core.timings.io;
+
+
+import lombok.extern.slf4j.Slf4j;
+import mc.core.timings.TimingsEventType;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.util.concurrent.locks.ReentrantLock;
+
+@SuppressWarnings("Duplicates")
+@Slf4j
+public class TimingsFileWriter implements TimingsWriter {
+    private FileOutputStream fileOutputStream;
+    private ObjectOutputStream writer;
+    private ReentrantLock lock = new ReentrantLock();
+
+    public TimingsFileWriter(File saveFile) throws IOException {
+        fileOutputStream = new FileOutputStream(saveFile);
+        writer = new ObjectOutputStream(fileOutputStream);
+    }
+
+    @Override
+    public void writeEvent(int threadId, int stackId, long time, TimingsEventType type) {
+        lock.lock();
+        try {
+            writer.writeInt(threadId);
+            writer.writeInt(stackId);
+            writer.writeLong(time);
+            writer.writeShort(type.getId());
+            writer.writeBoolean(false);
+        } catch (IOException e) {
+            log.error("Unable to write timings record", e);
+        } finally {
+            lock.unlock();
+        }
+    }
+
+    @Override
+    public void writeEvent(int threadId, int stackId, long time, TimingsEventType type, String data) {
+        lock.lock();
+        try {
+            writer.writeInt(threadId);
+            writer.writeInt(stackId);
+            writer.writeLong(time);
+            writer.writeShort(type.getId());
+            writer.writeBoolean(true);
+            writer.writeUTF(data);
+        } catch (IOException e) {
+            log.error("Unable to write timings record", e);
+        } finally {
+            lock.unlock();
+        }
+    }
+
+    @Override
+    public void close() throws IOException {
+        writer.close();
+        fileOutputStream.close();
+    }
+}

event-loop/src/main/java/mc/core/timings/io/TimingsLogWriter.java

@@ -0,0 +1,24 @@
+package mc.core.timings.io;
+
+import lombok.extern.slf4j.Slf4j;
+import mc.core.timings.TimingsEventType;
+
+import java.io.IOException;
+
+@Slf4j
+public class TimingsLogWriter implements TimingsWriter {
+    @Override
+    public void writeEvent(int threadId, int stackId, long time, TimingsEventType type) {
+        log.info("[{}] Thread #{}, Stack #{}: {}", time, threadId, stackId, type.toString());
+    }
+
+    @Override
+    public void writeEvent(int threadId, int stackId, long time, TimingsEventType type, String data) {
+        log.info("[{}] Thread #{}, Stack #{}: {} ({})", time, threadId, stackId, type.toString(), data);
+    }
+
+    @Override
+    public void close() throws IOException {
+
+    }
+}

event-loop/src/main/java/mc/core/timings/io/TimingsWriter.java

@@ -0,0 +1,13 @@
+package mc.core.timings.io;
+
+import mc.core.timings.TimingsEventType;
+
+import java.io.IOException;
+
+public interface TimingsWriter {
+    void writeEvent(int threadId, int stackId, long time, TimingsEventType type);
+
+    void writeEvent(int threadId, int stackId, long time, TimingsEventType type, String data);
+
+    void close() throws IOException;
+}

event-loop/src/main/java/mc/core/timings/io/TimingsWriterFactory.java

@@ -0,0 +1,8 @@
+package mc.core.timings.io;
+
+import java.io.File;
+import java.io.IOException;
+
+public interface TimingsWriterFactory {
+    TimingsWriter newInstance(File file) throws IOException;
+}

event-loop/src/test/java/mc/core/events/EventExecutorTest.java

@@ -0,0 +1,29 @@
+package mc.core.events;
+
+import mc.core.events.runner.ResourceAwareExecutorService;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class EventExecutorTest {
+
+    @Test
+    public void basicTest() throws InterruptedException {
+        AtomicBoolean testVariable = new AtomicBoolean(false);
+        CountDownLatch latch = new CountDownLatch(1);
+        ResourceAwareExecutorService service = new ResourceAwareExecutorService(1);
+        service.start();
+        service.addTask(() -> {
+            testVariable.set(true);
+            latch.countDown();
+        });
+
+        latch.await(1, TimeUnit.SECONDS);
+        service.stop();
+        Assert.assertTrue("Scheduled task was not executed", testVariable.get());
+
+    }
+}

event-loop/src/test/java/mc/core/events/EventLoopTest.java

@@ -0,0 +1,169 @@
+package mc.core.events;
+
+import mc.core.events.api.EventHandler;
+import mc.core.events.api.EventPriority;
+import mc.core.events.api.EventQueueOwner;
+import mc.core.events.api.Plugin;
+import mc.core.events.runner.ResourceAwareExecutorService;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+@SuppressWarnings("Duplicates")
+public class EventLoopTest {
+
+    @Test
+    public void basicTest() throws InterruptedException {
+        Plugin plugin = new Plugin() {
+        };
+
+        EventQueueOwner queueOwner = new EventQueueOwner() {
+        };
+
+
+        CountDownLatch latch = new CountDownLatch(1);
+        FullAsyncEventLoop eventLoop = new FullAsyncEventLoop();
+        eventLoop.addEventHandler(plugin, new Object() {
+            @EventHandler
+            public void onLoginEvent(LoginEvent event) {
+
+                latch.countDown();
+            }
+        });
+
+        ResourceAwareExecutorService service = new ResourceAwareExecutorService(1);
+        service.start();
+
+        eventLoop.setResourceAwareExecutorService(service);
+        eventLoop.asyncFireEvent(queueOwner, new LoginEvent(null));
+
+        latch.await(1, TimeUnit.SECONDS);
+        Assert.assertEquals("Event was not called", 0, latch.getCount());
+    }
+
+    @Test
+    public void consecutiveExecutionTest() throws InterruptedException {
+        Plugin plugin = new Plugin() {
+        };
+
+        EventQueueOwner queueOwner = new EventQueueOwner() {
+        };
+
+
+        CountDownLatch latch = new CountDownLatch(2);
+        FullAsyncEventLoop eventLoop = new FullAsyncEventLoop();
+        eventLoop.addEventHandler(plugin, new Object() {
+            @EventHandler
+            public void onLoginEvent(LoginEvent event) {
+
+                latch.countDown();
+            }
+        });
+
+        ResourceAwareExecutorService service = new ResourceAwareExecutorService(1);
+        service.start();
+        
+        eventLoop.setResourceAwareExecutorService(service);
+
+        eventLoop.asyncFireEvent(queueOwner, new LoginEvent(null));
+        eventLoop.asyncFireEvent(queueOwner, new LoginEvent(null));
+
+        latch.await(1, TimeUnit.SECONDS);
+        Assert.assertEquals("Event was not called", 0, latch.getCount());
+    }
+
+    @Test
+    public void prioritySystemTest() throws InterruptedException {
+        Plugin plugin = new Plugin() {
+        };
+
+        EventQueueOwner queueOwner = new EventQueueOwner() {
+        };
+
+
+        CountDownLatch latch = new CountDownLatch(3);
+        FullAsyncEventLoop eventLoop = new FullAsyncEventLoop();
+        List<Integer> priorities = new ArrayList<>(3);
+
+        eventLoop.addEventHandler(plugin, new Object() {
+            @EventHandler(priority = EventPriority.NORMAL)
+            public void login1(LoginEvent event) {
+                priorities.add(0);
+                latch.countDown();
+            }
+
+            @EventHandler(priority = EventPriority.HIGHEST)
+            public void login2(LoginEvent event) {
+                priorities.add(1);
+                latch.countDown();
+            }
+
+            @EventHandler(priority = EventPriority.LOWEST)
+            public void login3(LoginEvent event) {
+                priorities.add(2);
+                latch.countDown();
+            }
+        });
+
+        ResourceAwareExecutorService service = new ResourceAwareExecutorService(1);
+        service.start();
+
+        eventLoop.setResourceAwareExecutorService(service);
+
+        eventLoop.asyncFireEvent(queueOwner, new LoginEvent(null));
+
+        latch.await(1, TimeUnit.SECONDS);
+        Assert.assertEquals("Incorrect call sequence", "[2, 0, 1]", priorities.toString());
+    }
+
+    @Test
+    public void ignoreCancelledTest() throws InterruptedException {
+        Plugin plugin = new Plugin() {
+        };
+
+        EventQueueOwner queueOwner = new EventQueueOwner() {
+        };
+
+
+        CountDownLatch latch = new CountDownLatch(1);
+        FullAsyncEventLoop eventLoop = new FullAsyncEventLoop();
+        List<Integer> priorities = new ArrayList<>(2);
+
+        eventLoop.addEventHandler(plugin, new Object() {
+            @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
+            public void login1(LoginEvent event) {
+                priorities.add(0);
+                event.setCanceled(true);
+            }
+
+            @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+            public void login2(LoginEvent event) {
+                priorities.add(1);
+            }
+
+            @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+            public void login3(LoginEvent event) {
+                priorities.add(2);
+            }
+
+            @EventHandler(priority = EventPriority.MONITOR)
+            public void monitor(LoginEvent event) {
+                latch.countDown();
+            }
+        });
+
+        ResourceAwareExecutorService service = new ResourceAwareExecutorService(1);
+        service.start();
+
+        eventLoop.setResourceAwareExecutorService(service);
+
+        eventLoop.asyncFireEvent(queueOwner, new LoginEvent(null));
+
+        latch.await(1, TimeUnit.SECONDS);
+        Assert.assertEquals("Incorrect call sequence", "[2, 0]", priorities.toString());
+    }
+}

event-loop/src/test/java/mc/core/events/LockTest.java

@@ -0,0 +1,90 @@
+package mc.core.events;
+
+import mc.core.events.runner.lock.LockObserveList;
+import mc.core.events.runner.lock.PoorMansLock;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class LockTest {
+    @Test
+    public void basicTest() throws InterruptedException {
+        AtomicBoolean engageCallbackCalled = new AtomicBoolean(false);
+        AtomicBoolean disengageCallbackCalled = new AtomicBoolean(false);
+
+        PoorMansLock lock = new PoorMansLock();
+        lock.addCallback(lock1 -> {
+            if (lock1.isLocked())
+                engageCallbackCalled.set(true);
+            else
+                disengageCallbackCalled.set(true);
+        });
+        lock.lock();
+        Assert.assertTrue("Lock is not locked", lock.isLocked());
+        Assert.assertTrue("Engage callback was not called", engageCallbackCalled.get());
+
+        engageCallbackCalled.set(false);
+        try {
+            lock.lock();
+            Assert.assertFalse("Engage callback was called from attempt to block from the same thread", engageCallbackCalled.get());
+        } catch (Exception ex) {
+            Assert.fail("Exception fired while attempting to lock from the same thread");
+            return;
+        }
+
+        Assert.assertFalse("Disengage callback was called while not actually disengaging [x1]", disengageCallbackCalled.get());
+
+        AtomicBoolean lockExceptionFired = new AtomicBoolean(false);
+        AtomicBoolean unlockExceptionFired = new AtomicBoolean(false);
+        CountDownLatch latch = new CountDownLatch(1);
+        new Thread(() -> {
+            try {
+                lock.lock();
+            } catch (Exception ex) {
+                lockExceptionFired.set(true);
+            }
+            try {
+                lock.unlock();
+            } catch (Exception ex) {
+                unlockExceptionFired.set(true);
+            }
+            latch.countDown();
+        }).start();
+
+        latch.await();
+        Assert.assertTrue("Exception was not fired on concurrent lock attempt", lockExceptionFired.get());
+        Assert.assertTrue("Exception was not fired on non-owner unlock attempt", unlockExceptionFired.get());
+        Assert.assertFalse("Disengage callback was called while not actually disengaging [x2]", disengageCallbackCalled.get());
+
+        lock.unlock();
+        Assert.assertTrue("Disengage callback was on called on lock disengage", disengageCallbackCalled.get());
+    }
+
+    @Test
+    public void observeListTest() {
+        PoorMansLock lock1 = new PoorMansLock();
+        PoorMansLock lock2 = new PoorMansLock();
+
+        LockObserveList list = new LockObserveList();
+        list.add(lock1);
+        list.add(lock2);
+
+        Assert.assertTrue("LockObserveList was no able to correctly identify lock states for unlocked locks", list.isReady());
+        lock1.lock();
+        Assert.assertFalse("LockObserveList was no able to correctly identify lock states for list with one locked lock", list.isReady());
+
+
+        AtomicBoolean listReadyCallbackCalled = new AtomicBoolean(false);
+        list.setCallback(() -> listReadyCallbackCalled.set(true));
+        lock2.lock();
+
+        Assert.assertFalse("Callback was called when another lock got engaged", listReadyCallbackCalled.get());
+        lock1.unlock();
+        Assert.assertFalse("Callback was called while one lock is still locked", listReadyCallbackCalled.get());
+        lock2.unlock();
+        Assert.assertTrue("Callback was not called when both locks are actually free", listReadyCallbackCalled.get());
+
+    }
+}

event-loop/src/test/java/mc/core/timings/TimingsTest.java

@@ -0,0 +1,51 @@
+package mc.core.timings;
+
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+public class TimingsTest {
+    @Test
+    public void basicTest() {
+        try (Timings timings = Timings.start()) {
+            System.out.println("Test code");
+        }
+    }
+
+    @Test
+    public void brokenTimingTest() {
+        try (Timings timings = Timings.start()) {
+            Timings t1 = Timings.start();
+            Timings.start();
+            System.out.println("Pre Close t1");
+            t1.close();
+            System.out.println("Finished");
+        }
+    }
+
+    @Test
+    public void fileRecording() throws IOException {
+        Timings.getTimingsManager().startRecording(new File("test.timings"));
+
+        try (Timings t1 = Timings.start()) {
+            try {
+                Thread.sleep(20);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            try (Timings t2 = Timings.start()) {
+                Thread.sleep(10);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            Thread.sleep(5);
+
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+
+        Timings.getTimingsManager().stopRecording();
+    }
+}

flat_world/src/main/java/mc/world/flat/FlatWorld.java

@@ -8,11 +8,7 @@ import com.flowpowered.nbt.Tag;
 import lombok.Getter;
 import lombok.Setter;
 import mc.core.EntityLocation;
-import mc.core.world.IWorldType;
+import mc.core.world.*;
-import mc.core.world.Region;
-import mc.core.world.World;
-import mc.core.world.WorldType;
-import mc.core.world.chunk.Chunk;
 
 import java.util.UUID;
 import java.util.stream.Stream;
@@ -29,7 +25,7 @@ public class FlatWorld implements World {
     @Getter
     @Setter
     private EntityLocation spawn = new EntityLocation(0d, 6d, 0d, 0f, 0f, this);
-    private Chunk chunk = new SimpleChunk(0, 0, 0); //FIXME temporary dummy
+    private ChunkSection chunkSection = new SimpleChunkSection();
 
     @Override
     public IWorldType getWorldType() {
@@ -37,12 +33,12 @@ public class FlatWorld implements World {
     }
 
     @Override
-    public Chunk getChunk(int x, int y, int z) {
+    public ChunkSection getChunk(int x, int y, int z) {
-        return chunk;
+        return chunkSection;
     }
 
     @Override
-    public void setChunk(int x, int y, int z, Chunk chunk) {
+    public void setChunk(int x, int y, int z, ChunkSection chunkSection) {
         throw new UnsupportedOperationException();
     }
 

flat_world/src/main/java/mc/world/flat/SimpleChunkSection.java

@@ -5,34 +5,14 @@
 package mc.world.flat;
 
 import mc.core.world.Biome;
+import mc.core.world.ChunkSection;
+import mc.core.world.Region;
+import mc.core.world.World;
 import mc.core.world.block.Block;
 import mc.core.world.block.BlockFactory;
-import mc.core.world.chunk.Chunk;
+import mc.core.world.block.BlockType;
-
-import static mc.core.world.block.BlockType.*;
-
-public class SimpleChunk implements Chunk {
-    private static BlockFactory blockFactory = new BlockFactory();
-    private final int x, y, z;
-
-    public SimpleChunk(int x, int y, int z) {
-        this.x = x;
-        this.y = y;
-        this.z = z;
-    }
-
-    @Override
-    public Block getBlock(int x, int y, int z) {
-        if (y == 0) return blockFactory.create(BEDROCK);
-        else if (y >= 1 && y <= 2) return blockFactory.create(DIRT);
-        else if (y == 3) return blockFactory.create(GRASS);
-        else return blockFactory.create(AIR);
-    }
-
-    @Override
-    public void setBlock(Block block) {
-    }
 
+public class SimpleChunkSection implements ChunkSection {
     @Override
     public int getSkyLight(int x, int y, int z) {
         if (y <= 3) return 0;
@@ -66,16 +46,41 @@ public class SimpleChunk implements Chunk {
 
     @Override
     public int getX() {
-        return x;
+        return 0;
     }
 
     @Override
     public int getY() {
-        return y;
+        return 0;
     }
 
     @Override
     public int getZ() {
-        return z;
+        return 0;
+    }
+
+    @Override
+    public void setBlock(Block block) {
+
+    }
+
+    @Override
+    public Block getBlock(int x, int y, int z) {
+        BlockFactory blockFactory = new BlockFactory();
+
+        if (y == 0) return blockFactory.create(BlockType.BEDROCK, 0);
+        else if (y >= 1 && y <= 2) return blockFactory.create(BlockType.DIRT, 0);
+        else if (y == 3) return blockFactory.create(BlockType.GRASS, 0);
+        else return blockFactory.create(BlockType.AIR, 0);
+    }
+
+    @Override
+    public Region getRegion() {
+        return null;
+    }
+
+    @Override
+    public World getWorld() {
+        return null;
     }
 }

generated_world/src/main/java/mc/world/generated_world/chunk/ChunkImpl.java

@@ -1,77 +1,61 @@
 package mc.world.generated_world.chunk;
 
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
+import mc.core.exception.ResourceUnloadedException;
-import mc.core.world.block.Block;
+import mc.core.world.ChunkSection;
-import mc.core.world.block.BlockFactory;
-import mc.core.world.block.BlockType;
-import mc.core.world.Biome;
-import mc.core.world.chunk.Chunk;
 import mc.core.world.Region;
+import mc.core.world.World;
+import mc.core.world.chunk.Chunk;
+
+import java.lang.ref.Reference;
+import java.lang.ref.WeakReference;
 
 import static mc.world.generated_world.WorldConstants.WORLD_CHUNK_SIZE;
 
-@RequiredArgsConstructor
+public class ChunkImpl implements Chunk {
-public class ChunkImpl implements Chunk{
-    private static final BlockFactory blockFactory = new BlockFactory();
     @Getter
     private final int x;
     @Getter
-    private final int y;
-    @Getter
     private final int z;
-    private final Block[][][] blocks = new Block[WORLD_CHUNK_SIZE][WORLD_CHUNK_SIZE][WORLD_CHUNK_SIZE];
+    private Reference<Region> regionReference;
-    private final transient Region region;
+    private ChunkSection[] sections = new ChunkSection[WORLD_CHUNK_SIZE];
 
-    @Override
+    public ChunkImpl (int x, int z, Region region) {
-    public Block getBlock(int x, int y, int z) {
+        this.x = x;
-        Block block = blocks[x][y][z];
+        this.z = z;
-        if (block == null) {
+        this.regionReference = new WeakReference<>(region);
-            block = blockFactory.create(BlockType.AIR, 0, x, y, z);
-        }
-        block.setLight(15);
-        return block;
     }
 
     @Override
-    public void setBlock(Block block) {
+    public World getWorld() {
-        if (block.getBlockType() == BlockType.AIR) {
+        Region region = getRegion();
-            blocks[block.getLocation().getBlockX()]
+        if (region == null) {
-                  [block.getLocation().getBlockY()]
+            throw new ResourceUnloadedException("Region is unloaded");
-                  [block.getLocation().getBlockZ()] = null;
         }
-        blocks[block.getLocation().getBlockX()]
+        return region.getWorld();
-              [block.getLocation().getBlockY()]
-              [block.getLocation().getBlockZ()] = block;
     }
 
     @Override
-    public int getSkyLight(int x, int y, int z) {
+    public ChunkSection getChunkSection(int height) {
-        return 15;
+        return sections[height];
     }
 
     @Override
-    public void setSkyLight(int x, int y, int z, int lightLevel) {
+    public ChunkSection setChunkSection(int height, ChunkSection chunkSection) {
-        throw new UnsupportedOperationException();
+        sections[height] = chunkSection;
+        return chunkSection;
     }
 
     @Override
-    public int getAddition(int x, int y, int z) {
+    public Region getRegion() {
-        return 0;
+        if (regionReference == null) {
+            return null;
         }
 
-    @Override
+        if (regionReference.get() == null) {
-    public void setAddition(int x, int y, int z, int value) {
+            throw new ResourceUnloadedException("Region is unloaded");
-        throw new UnsupportedOperationException();
         }
 
-    @Override
+        return regionReference.get();
-    public Biome getBiome(int x, int z) {
-        return region.getBiomeAt(x + this.x * WORLD_CHUNK_SIZE,z + this.z * WORLD_CHUNK_SIZE);
-    }
-
-    @Override
-    public void setBiome(int x, int z, Biome biome) {
-        region.setBiome(x + this.x * WORLD_CHUNK_SIZE,z + this.z * WORLD_CHUNK_SIZE, biome);
     }
 }

generated_world/src/main/java/mc/world/generated_world/chunk/ChunkSectionImpl.java

@@ -0,0 +1,99 @@
+package mc.world.generated_world.chunk;
+
+import lombok.Getter;
+import mc.core.exception.ResourceUnloadedException;
+import mc.core.world.Biome;
+import mc.core.world.ChunkSection;
+import mc.core.world.Region;
+import mc.core.world.World;
+import mc.core.world.block.Block;
+import mc.core.world.block.BlockFactory;
+import mc.core.world.block.BlockType;
+
+import java.lang.ref.Reference;
+import java.lang.ref.WeakReference;
+
+import static mc.world.generated_world.WorldConstants.WORLD_CHUNK_SIZE;
+
+public class ChunkSectionImpl implements ChunkSection {
+    @Getter
+    private final int x;
+    @Getter
+    private final int y;
+    @Getter
+    private final int z;
+    private final Block[][][] blocks = new Block[WORLD_CHUNK_SIZE][WORLD_CHUNK_SIZE][WORLD_CHUNK_SIZE];
+    private final transient Reference<Region> region;
+    private BlockFactory blockFactory = new BlockFactory();
+
+    public ChunkSectionImpl(int x, int y, int z, Region region) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.region = new WeakReference<>(region);
+    }
+
+    @Override
+    public int getSkyLight(int x, int y, int z) {
+        return 15;
+    }
+
+    @Override
+    public void setSkyLight(int x, int y, int z, int lightLevel) {
+
+    }
+
+    @Override
+    public int getAddition(int x, int y, int z) {
+        return 0;
+    }
+
+    @Override
+    public void setAddition(int x, int y, int z, int value) {
+
+    }
+
+    @Override
+    public Biome getBiome(int x, int z) {
+        return getRegion().getBiomeAt(x + this.x * WORLD_CHUNK_SIZE,z + this.z * WORLD_CHUNK_SIZE);
+    }
+
+    @Override
+    public void setBiome(int x, int z, Biome biome) {
+        getRegion().setBiome(x + this.x * WORLD_CHUNK_SIZE,z + this.z * WORLD_CHUNK_SIZE, biome);
+    }
+
+    @Override
+    public void setBlock(Block block) {
+        if (block.getBlockType() == BlockType.AIR) {
+            blocks[block.getLocation().getBlockX()][block.getLocation().getBlockY()][block.getLocation().getBlockZ()] = null;
+            return;
+        }
+        blocks[block.getLocation().getBlockX()][block.getLocation().getBlockY()][block.getLocation().getBlockZ()] = block;
+    }
+
+    @Override
+    public Block getBlock(int x, int y, int z) {
+        Block block = blocks[x][y][z];
+        if (block == null) {
+            return blockFactory.create(BlockType.AIR, 0, x, y, z);
+        }
+        return blocks[x][y][z];
+    }
+
+    @Override
+    public Region getRegion() {
+        if (region == null) {
+            return null;
+        }
+        if (region.get() == null) {
+            throw new ResourceUnloadedException("Region is unloaded");
+        }
+        return region.get();
+    }
+
+    @Override
+    public World getWorld() {
+        return getRegion().getWorld();
+    }
+}

generated_world/src/main/java/mc/world/generated_world/chunk/ChunkSectionProxy.java

@@ -1,18 +1,20 @@
 package mc.world.generated_world.chunk;
 
+import mc.core.world.ChunkSection;
+import mc.core.world.Region;
+import mc.core.world.World;
 import mc.core.world.block.Block;
 import mc.core.world.Biome;
-import mc.core.world.chunk.Chunk;
 
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
-public class ChunkProxy implements Chunk {
+public class ChunkSectionProxy implements ChunkSection {
-    private final Chunk chunk;
+    private final ChunkSection chunk;
     private volatile transient long lastUsage = System.currentTimeMillis();
     private final transient ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
 
-    public ChunkProxy(Chunk chunk) {
+    public ChunkSectionProxy(ChunkSection chunk) {
         this.chunk = chunk;
     }
 
@@ -34,6 +36,16 @@ public class ChunkProxy implements Chunk {
         return chunk.getBlock(x, y, z);
     }
 
+    @Override
+    public Region getRegion() {
+        return chunk.getRegion();
+    }
+
+    @Override
+    public World getWorld() {
+        return chunk.getWorld();
+    }
+
     @Override
     public void setBlock(Block block) {
         use();

generated_world/src/main/java/mc/world/generated_world/chunk/InMemoryCacheChunkLoader.java

@@ -27,7 +27,7 @@ public class InMemoryCacheChunkLoader implements ChunkLoader {
     @Autowired
     private ChunkReader chunkReader;
     @Autowired
-    private Serializer<Chunk> chunkSerializer;
+    private Serializer<ChunkSection> chunkSerializer;
     @Autowired
     private RegionReaderWriter regionReaderWritter;
 
@@ -46,14 +46,14 @@ public class InMemoryCacheChunkLoader implements ChunkLoader {
     }
 
     @Override
-    public Optional<Chunk> loadChunk(int x, int y, int z) {
+    public Optional<ChunkSection> loadChunk(int x, int y, int z) {
         File file = getChuckFile(x, y, z);
         if (!file.exists()) {
             return Optional.empty();
         } else {
             try {
-                Chunk chunk = chunkReader.read(world.getRegion(x / WORLD_CHUNK_SIZE, z / WORLD_CHUNK_SIZE), x, y, z);
+                ChunkSection chunkSection = chunkReader.read(world.getRegion(x / WORLD_CHUNK_SIZE, z / WORLD_CHUNK_SIZE), x, y, z);
-                return Optional.of(chunk);
+                return Optional.of(chunkSection);
             } catch (IOException e) {
                 log.error("Error occurred while reading chunk file: " + file.getAbsolutePath(), e);
                 return Optional.empty();
@@ -62,12 +62,12 @@ public class InMemoryCacheChunkLoader implements ChunkLoader {
     }
 
     @Override
-    public Chunk loadOrGenerateChunk(int x, int y, int z) {
+    public ChunkSection loadOrGenerateChunk(int x, int y, int z) {
         int regX = x / WORLD_CHUNK_SIZE;
         int regZ = z / WORLD_CHUNK_SIZE;
         File regionFile = new File(worldFolder, MessageFormat.format(REGION_FILE_NAME_TEMPLATE, regX, regZ));
         Region region;
-        Chunk chunk;
+        ChunkSection chunkSection;
         if (!regionFile.exists()) {
             log.debug("Region [{}, {}] not found. Generating!", regX, regZ);
             regionFile.mkdirs();
@@ -78,17 +78,17 @@ public class InMemoryCacheChunkLoader implements ChunkLoader {
                 log.error("Error occurred while writting biome file", e);
             }
             saveRegion(region);
-            chunk = region.getChunkAt(x % WORLD_CHUNK_SIZE, y % WORLD_CHUNK_SIZE, z % WORLD_CHUNK_SIZE);
+            chunkSection = region.getChunkAt(x % WORLD_CHUNK_SIZE, y % WORLD_CHUNK_SIZE, z % WORLD_CHUNK_SIZE);
         } else {
             try {
                 region = regionReaderWritter.read(regX, regZ, world);
-                chunk = chunkReader.read(region, x, y, z);
+                chunkSection = chunkReader.read(region, x, y, z);
             } catch (IOException e) {
-                log.error("Error occurred while reading chunk file", e);
+                log.error("Error occurred while reading chunkSection file", e);
                 return null;
             }
         }
-        return chunk;
+        return chunkSection;
     }
 
     private void saveRegion (Region region) {

generated_world/src/main/java/mc/world/generated_world/generator/SeedBasedWorldGenerator.java

@@ -5,7 +5,6 @@ import lombok.extern.slf4j.Slf4j;
 import mc.core.world.block.BlockFactory;
 import mc.core.world.block.BlockType;
 import mc.core.world.*;
-import mc.core.world.chunk.Chunk;
 import mc.world.generated_world.region.RegionImpl;
 import mc.world.generated_world.world.CubicWorld;
 import mc.world.generated_world.world.Temperature;
@@ -226,7 +225,7 @@ public class SeedBasedWorldGenerator implements WorldGenerator {
                     region.setBiome(x, z, biomes[x][z]);
                     if (heightMap[x][z] < WORLD_SEA_LEVEL) {
                         for (int y = 0; y < WORLD_SEA_LEVEL; y ++) {
-                            Chunk chunk = region.getChunkAt(x / 16, y / 16, z / 16);
+                            ChunkSection chunk = region.getChunkAt(x / 16, y / 16, z / 16);
                             if (y == 0) {
                                 chunk.setBlock(blockFactory.create(BlockType.BEDROCK, 0, x % 16, y % 16, z % 16));
                                 continue;
@@ -243,7 +242,7 @@ public class SeedBasedWorldGenerator implements WorldGenerator {
                         }
                     } else {
                         for (int y = 0; y < heightMap[x][z]; y++) {
-                            Chunk chunk = region.getChunkAt(x / 16, y / 16, z / 16);
+                            ChunkSection chunk = region.getChunkAt(x / 16, y / 16, z / 16);
                             if (y == 0) {
                                 chunk.setBlock(blockFactory.create(BlockType.BEDROCK, 0, x % 16, y % 16, z % 16));
                                 continue;

generated_world/src/main/java/mc/world/generated_world/region/RegionImpl.java

@@ -1,61 +1,90 @@
 package mc.world.generated_world.region;
 
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import mc.core.exception.ResourceUnloadedException;
 import mc.core.serialization.IRegionReaderWriter;
 import mc.core.serialization.Serializer;
 import mc.core.world.*;
 import mc.core.world.chunk.Chunk;
 import mc.core.world.chunk.ChunkLoader;
+import mc.world.generated_world.chunk.ChunkSectionProxy;
 import mc.world.generated_world.chunk.InMemoryCacheChunkLoader;
 import mc.world.generated_world.chunk.ChunkImpl;
-import mc.world.generated_world.chunk.ChunkProxy;
+import mc.world.generated_world.chunk.ChunkSectionImpl;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.lang.ref.Reference;
+import java.lang.ref.WeakReference;
 import java.text.MessageFormat;
 
 import static mc.world.generated_world.WorldConstants.*;
 
 @Slf4j
-@RequiredArgsConstructor
 public class RegionImpl implements Region{
     @Getter
     private final int x;
     @Getter
     private final int z;
-    private final ChunkProxy[][][] chunks = new ChunkProxy[WORLD_REGION_SIZE/WORLD_CHUNK_SIZE][WORLD_REGION_SIZE/WORLD_CHUNK_SIZE][WORLD_REGION_SIZE/WORLD_CHUNK_SIZE];
+    private final ChunkSection[][][] chunkSectionProxies = new ChunkSectionProxy[WORLD_REGION_SIZE/WORLD_CHUNK_SIZE][WORLD_REGION_SIZE/WORLD_CHUNK_SIZE][WORLD_REGION_SIZE/WORLD_CHUNK_SIZE];
     private final Biome[][] biomes = new Biome[WORLD_REGION_SIZE][WORLD_REGION_SIZE];
-    @Getter
+    private final transient Reference<World> world;
-    private final transient World world;
+    private final Chunk[][] chunks = new Chunk[WORLD_REGION_SIZE/WORLD_CHUNK_SIZE][WORLD_REGION_SIZE/WORLD_CHUNK_SIZE];
     @Autowired
     private ChunkLoader chunkLoader;
 
+    public RegionImpl (int x, int z, World world) {
+        this.x = x;
+        this.z = z;
+        this.world = new WeakReference<>(world);
+    }
+
     @Override
-    public Chunk getChunkAt(int x, int y, int z) {
+    public Chunk getChunk(int x, int z) {
-        if (x < 0 || y < 0 || z < 0 || x >= 16 || y >= 16 || z >= 16) {
+        if (x < 0 || z < 0 || x >= 16 || z >= 16) {
-            throw new RuntimeException(MessageFormat.format("Invalid chunk coordinates [{0} {1} {2}]", x, y, z));
+            throw new RuntimeException(MessageFormat.format("Invalid chunk coordinates [{0} {1}]", x, z));
         }
-        if (chunkLoader == null) {
+
-            chunkLoader = new InMemoryCacheChunkLoader(world);
+        Chunk chunk = chunks[x][z];
-        }
-        Chunk chunk = chunks[x][y][z];
         if (chunk == null) {
-            chunk = chunkLoader.loadChunk(x + this.x * WORLD_REGION_SIZE, y, this.z * WORLD_REGION_SIZE).orElse(new ChunkImpl(x, y, z, this));
+            chunk = new ChunkImpl(x, z, this);
-            chunks[x][y][z] = new ChunkProxy(chunk);
+            for (int y = 0; y < WORLD_CHUNK_SIZE; y ++) {
+                chunk.setChunkSection(y, getChunkAt(x, y, z));
+            }
         }
         return chunk;
     }
 
     @Override
-    public void setChunk(int x, int y, int z, Chunk chunk) {
+    public void setChunk(int x, int z, Chunk chunk) {
-        if (x < 0 || y < 0 || z < 0 || x >= 16 || y >= 16 || z >= 16) {
+        chunks[x][z] = chunk;
-            throw new RuntimeException(MessageFormat.format("Invalid chunk coordinates [{0} {1} {2}]", x, y, z));
     }
-        chunks[x][y][z] = new ChunkProxy(chunk);
+
+    @Override
+    public ChunkSection getChunkAt(int x, int y, int z) {
+        if (x < 0 || y < 0 || z < 0 || x >= 16 || y >= 16 || z >= 16) {
+            throw new RuntimeException(MessageFormat.format("Invalid chunkSection coordinates [{0} {1} {2}]", x, y, z));
+        }
+        if (chunkLoader == null) {
+            chunkLoader = new InMemoryCacheChunkLoader(getWorld());
+        }
+        ChunkSection chunkSection = chunkSectionProxies[x][y][z];
+        if (chunkSection == null) {
+            chunkSection = chunkLoader.loadChunk(x + this.x * WORLD_REGION_SIZE, y, this.z * WORLD_REGION_SIZE).orElse(new ChunkSectionImpl(x, y, z, this));
+            chunkSectionProxies[x][y][z] = new ChunkSectionProxy(chunkSection);
+        }
+        return chunkSection;
+    }
+
+    @Override
+    public void setChunk(int x, int y, int z, ChunkSection chunkSection) {
+        if (x < 0 || y < 0 || z < 0 || x >= 16 || y >= 16 || z >= 16) {
+            throw new RuntimeException(MessageFormat.format("Invalid chunkSection coordinates [{0} {1} {2}]", x, y, z));
+        }
+        chunkSectionProxies[x][y][z] = new ChunkSectionProxy(chunkSection);
     }
 
     @Override
@@ -75,9 +104,20 @@ public class RegionImpl implements Region{
     }
 
     @Override
-    public void save(Serializer<Chunk> chunkSerializer, IRegionReaderWriter regionReaderWriter) throws IOException {
+    public World getWorld() {
+        if (world == null) {
+            return null;
+        }
+        if (world.get() == null) {
+            throw new ResourceUnloadedException("World is unloaded");
+        }
+        return world.get();
+    }
+
+    @Override
+    public void save(Serializer<ChunkSection> chunkSerializer, IRegionReaderWriter regionReaderWriter) throws IOException {
         String worldPath = System.getProperty("worlds.folder", "worlds");
-        File worldFile = new File(worldPath, world.getWorldId().toString());
+        File worldFile = new File(worldPath, getWorld().getWorldId().toString());
         File regionFile = new File(worldFile, MessageFormat.format(REGION_FILE_NAME_TEMPLATE, this.getX(), this.getZ()));
         if (!regionFile.exists()) {
             regionFile.mkdirs();
@@ -86,8 +126,8 @@ public class RegionImpl implements Region{
         for (int x = 0; x < WORLD_CHUNK_SIZE; x ++) {
             for (int z = 0; z < WORLD_CHUNK_SIZE; z ++) {
                 for (int y = 0; y < WORLD_CHUNK_SIZE; y++) {
-                    Chunk chunk = this.getChunkAt(x, y, z);
+                    ChunkSection chunkSection = this.getChunkAt(x, y, z);
-                    byte[] chunkBytes = chunkSerializer.serialize(chunk);
+                    byte[] chunkBytes = chunkSerializer.serialize(chunkSection);
                     if (chunkBytes.length > 0) {
                         File chunkFile = new File(regionFile, MessageFormat.format(CHUNK_FILE_NAME_TEMPLATE, x, y, z));
                         try (FileOutputStream fileOutputStream = new FileOutputStream(chunkFile)) {

generated_world/src/main/java/mc/world/generated_world/serialization/BlockSerializerDeserializer.java

@@ -5,7 +5,7 @@ import mc.core.world.block.BlockFactory;
 import mc.core.world.block.BlockType;
 import mc.core.serialization.Deserializer;
 import mc.core.serialization.Serializer;
-import mc.core.world.chunk.Chunk;
+import mc.core.world.ChunkSection;
 
 /**
  * Prototype
@@ -13,20 +13,20 @@ import mc.core.world.chunk.Chunk;
 public class BlockSerializerDeserializer implements Serializer<Block>, Deserializer<Block> {
 
     private BlockFactory blockFactory;
-    private Chunk chunk;
+    private ChunkSection chunkSection;
 
-    public BlockSerializerDeserializer(BlockFactory blockFactory, Chunk chunk) {
+    public BlockSerializerDeserializer(BlockFactory blockFactory, ChunkSection chunkSection) {
         this.blockFactory = blockFactory;
-        this.chunk = chunk;
+        this.chunkSection = chunkSection;
     }
 
     @Override
     public Block deserialize(byte[] bytes) {
         int id = bytes[0] + 128;
         int meta = bytes[1] >> 4;
-        int x = (bytes[1] & 0xf) + chunk.getX() * 16;
+        int x = (bytes[1] & 0xf) + chunkSection.getX() * 16;
-        int y = bytes[2] >> 4 + chunk.getY() * 16;
+        int y = bytes[2] >> 4 + chunkSection.getY() * 16;
-        int z = (bytes[2] & 0xf) + chunk.getZ() * 16;
+        int z = (bytes[2] & 0xf) + chunkSection.getZ() * 16;
         BlockType type = BlockType.values()[id];
         Block block = blockFactory.create(type, meta);
         block.getLocation().setX(x);

generated_world/src/main/java/mc/world/generated_world/serialization/ChunkReader.java

@@ -1,11 +1,12 @@
 package mc.world.generated_world.serialization;
 
+import mc.core.Location;
 import mc.core.world.block.Block;
 import mc.core.serialization.Deserializer;
 import mc.core.serialization.IChunkReader;
-import mc.core.world.chunk.Chunk;
+import mc.core.world.ChunkSection;
 import mc.core.world.Region;
-import mc.world.generated_world.chunk.ChunkImpl;
+import mc.world.generated_world.chunk.ChunkSectionImpl;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import java.io.File;
@@ -26,22 +27,22 @@ public class ChunkReader implements IChunkReader{
     }
 
     @Override
-    public Chunk read (Region region, int x, int y, int z) throws IOException {
+    public ChunkSection read (Region region, int x, int y, int z) throws IOException {
         x %= WORLD_REGION_SIZE;
         y %= WORLD_REGION_SIZE;
         z %= WORLD_REGION_SIZE;
         File chunkFile = new File(new File(worldFolder, MessageFormat.format(REGION_FILE_NAME_TEMPLATE, region.getX(), region.getZ())), MessageFormat.format(CHUNK_FILE_NAME_TEMPLATE, x, y, z));
         byte[] chunkBytes = Files.readAllBytes(Paths.get(chunkFile.toURI()));
         int blocks = (chunkBytes.length) / 3;
-        Chunk chunk = new ChunkImpl(x, y, z, region);
+        ChunkSection chunkSection = new ChunkSectionImpl(x, y, z, region);
         for (int i = 0; i < blocks; i ++) {
             byte[] blockBytes = new byte[3];
             blockBytes[0] = chunkBytes[3 * i];
             blockBytes[1] = chunkBytes[1 + 3 * i];
             blockBytes[2] = chunkBytes[2 + 3 * i];
             Block block = blockDeserializer.deserialize(blockBytes);
-            chunk.setBlock(block);
+            chunkSection.setBlock(block);
         }
-        return chunk;
+        return chunkSection;
     }
 }

generated_world/src/main/java/mc/world/generated_world/serialization/ChunkSerializer.java

@@ -5,7 +5,7 @@ import mc.core.world.block.Block;
 import mc.core.world.block.BlockFactory;
 import mc.core.world.block.BlockType;
 import mc.core.serialization.Serializer;
-import mc.core.world.chunk.Chunk;
+import mc.core.world.ChunkSection;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import java.io.ByteArrayOutputStream;
@@ -14,20 +14,20 @@ import java.io.IOException;
 import static mc.world.generated_world.WorldConstants.WORLD_CHUNK_SIZE;
 
 @Slf4j
-public class ChunkSerializer implements Serializer<Chunk> {
+public class ChunkSerializer implements Serializer<ChunkSection> {
 
     @Autowired
     private Serializer<Block>  blockSerializer;
 
     @Override
-    public byte[] serialize(Chunk chunk) {
+    public byte[] serialize(ChunkSection chunkSection) {
-        Serializer<Block> blockSerializer = new BlockSerializerDeserializer(new BlockFactory(), chunk);
+        Serializer<Block> blockSerializer = new BlockSerializerDeserializer(new BlockFactory(), chunkSection);
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         Block current;
         for (int x = 0; x < WORLD_CHUNK_SIZE; x ++) {
             for (int y = 0; y < WORLD_CHUNK_SIZE; y ++) {
                 for (int z = 0; z < WORLD_CHUNK_SIZE; z ++) {
-                    current = chunk.getBlock(x, y, z);
+                    current = chunkSection.getBlock(x, y, z);
                     if (current != null && current.getBlockType() != BlockType.AIR) {
                         try {
                             baos.write(blockSerializer.serialize(current));

generated_world/src/main/java/mc/world/generated_world/world/CubicWorld.java

@@ -4,32 +4,58 @@ import com.flowpowered.nbt.Tag;
 import lombok.Getter;
 import lombok.Setter;
 import lombok.extern.slf4j.Slf4j;
+import mc.core.Direction;
 import mc.core.EntityLocation;
-import mc.core.world.IWorldType;
+import mc.core.world.*;
-import mc.core.world.Region;
+import mc.world.generated_world.serialization.RegionReaderWriter;
-import mc.core.world.World;
-import mc.core.world.block.BlockType;
-import mc.core.world.chunk.Chunk;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import java.io.File;
+import java.io.IOException;
+import java.text.MessageFormat;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.UUID;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 import java.util.stream.Stream;
 
-import static mc.world.generated_world.WorldConstants.WORLD_CHUNK_SIZE;
+import static mc.world.generated_world.WorldConstants.REGION_FILE_NAME_TEMPLATE;
-import static mc.world.generated_world.WorldConstants.WORLD_MAX_HEIGHT;
+
+/*
+ *       NORTH
+ *
+ *   EAST     WEST
+ *
+ *       SOUTH
+ *
+ *   + ----> X
+ *   |
+ *   |
+ *   |
+ *   V Z
+ */
 
 @Slf4j
 public class CubicWorld implements World {
+    private int pointX = -1;
+    private int pointZ = -1;
+    private int sizeX = 2;
+    private int sizeZ = 2;
+    private Region[][] regions = new Region[sizeX][sizeZ];
+    private final Lock regionSaveLock = new ReentrantLock();
+    @Autowired
+    private RegionReaderWriter regionReaderWriter;
+    @Autowired
+    private WorldGenerator worldGenerator;
+    @Setter
+    private boolean autoSaveRegionAfterGenerating = true;
     @Getter
     private final UUID worldId;
     private final int seed;
-    private volatile EntityLocation warpPosition;
+    private volatile EntityLocation spawn;
     private final transient Object spawnLocationLock = new Object();
     private final Map<String, Tag<?>> nbtTagMap = new HashMap<>();
-    @Autowired
-    private RegionManager regionManager;
     @Getter@Setter
     private String name;
 
@@ -55,55 +81,76 @@ public class CubicWorld implements World {
 
     @Override
     public IWorldType getWorldType() {
-        return null;
+        return null; //FIXME
     }
 
     @Override
     public EntityLocation getSpawn() {
-        if (warpPosition == null) {
+        /* FIXME */
+        if (spawn == null) {
+            log.warn("Spawn is not defined! Set default spawn: [8, 128, 8]");
+            setSpawn(new EntityLocation(8d, 128d, 8d, 0f, 0f, this));
+        }
+        return spawn;
+    }
+
+    @Override
+    public void setSpawn(EntityLocation entityLocation) {
         synchronized (spawnLocationLock) {
-                if (warpPosition == null) {
+            entityLocation.setWorld(this);
-                    log.warn("Spawn location is not defined. Trying to select best location");
+            this.spawn = entityLocation;
-                    warpPosition = new EntityLocation(0d, 10d, 0d, 0f, 0f, this);
-                    for (int y = WORLD_MAX_HEIGHT; y > 0; y --) {
-                        Chunk chunk = getChunk(0,y / WORLD_CHUNK_SIZE, 0);
-                        if (chunk.getBlock(0, y, 0).getBlockType() != BlockType.AIR) {
-                            warpPosition = new EntityLocation(0d, y + 1d, 0d, 0f, 0f, this);
-                            break;
-                        }
-                    }
-                    warpPosition = new EntityLocation(0d, 10d, 0d, 0f, 0f, this);
-                }
-            }
-        }
-        return warpPosition;
-    }
-
-    @Override
-    public void setSpawn(EntityLocation warpPosition) {
-        synchronized (spawnLocationLock) {
-            this.warpPosition = warpPosition;
         }
     }
 
     @Override
-    public Chunk getChunk(int x, int y, int z) {
+    public ChunkSection getChunk(int x, int y, int z) {
-        return null;
+        Region region = getRegion(x / 16, z / 16);
+        return region.getChunkAt(x % 16, y % 16, z % 16);
     }
 
     @Override
-    public void setChunk(int x, int y, int z, Chunk chunk) {
+    public void setChunk(int x, int y, int z, ChunkSection chunkSection) {
-
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public Region getRegion(int x, int z) {
-        return null;
+        checkCoordsInCache(x, z);
+        Region region;
+        if (regions[x - pointX][z - pointZ] == null) {
+            File file = new File(new File("worlds", this.getWorldId().toString()), MessageFormat.format(REGION_FILE_NAME_TEMPLATE, x, z));
+            if (!file.exists()) {
+                region = worldGenerator.generateRegion(x, z, this);
+                if (autoSaveRegionAfterGenerating) {
+                    try {
+                        regionReaderWriter.write(region);
+                    } catch (IOException e) {
+                        log.error("Error occurred while saving region data");
+                    }
+                }
+            } else {
+                try {
+                    region = regionReaderWriter.read(x, z, this);
+                } catch (IOException e) {
+                    log.error("Error occurred while loading region");
+                    region = null;
+                }
+            }
+            setRegion(region.getX(), region.getZ(), region);
+        } else {
+            region = regions[x - pointX][z - pointZ];
+        }
+        return region;
     }
 
     @Override
     public void setRegion(int x, int z, Region region) {
-
+        try {
+            regionSaveLock.lock();
+            regions[x - pointX][z - pointZ] = region;
+        } finally {
+            regionSaveLock.unlock();
+        }
     }
 
     @Override
@@ -125,4 +172,53 @@ public class CubicWorld implements World {
     public Stream<Tag<?>> tagStream() {
         return nbtTagMap.values().stream();
     }
+
+    private void checkCoordsInCache (int x, int z) {
+        if (x < pointX) {
+            addLines(Direction.EAST, pointX - x);
+        } else if (x > pointX + sizeX) {
+            addLines(Direction.WEST, x - (pointX + sizeX));
+        } else if (z < pointZ) {
+            addLines(Direction.NORTH, pointZ - z);
+        } else if (z > pointZ + sizeZ) {
+            addLines(Direction.SOUTH, z - (pointZ + sizeZ));
+        }
+    }
+
+    private void addLines (Direction direction, int amount) {
+        int addBeforeX = 0;
+        int addAfterX = 0;
+        int addBeforeZ = 0;
+        int addAfterZ = 0;
+        switch (direction) {
+            case NORTH:
+                addBeforeZ = amount;
+                break;
+            case EAST:
+                addBeforeX = amount;
+                break;
+            case WEST:
+                addAfterX = amount;
+                break;
+            case SOUTH:
+                addAfterZ = amount;
+                break;
+        }
+        try {
+            regionSaveLock.lock();
+            int tempSizeX = sizeX + addAfterX + addBeforeX;
+            int tempSizeZ = sizeZ + addAfterZ + addBeforeZ;
+            Region[][] temp = new Region[tempSizeX][tempSizeZ];
+            for (int x = 0; x < sizeX; x ++) {
+                System.arraycopy(regions[x], 0, temp[x + addBeforeX], addBeforeZ, sizeZ);
+            }
+
+            this.sizeX = tempSizeX;
+            this.sizeZ = tempSizeZ;
+            this.pointX = pointX - addBeforeX;
+            this.pointZ = pointZ - addBeforeZ;
+        } finally {
+            regionSaveLock.unlock();
+        }
+    }
 }

generated_world/src/main/java/mc/world/generated_world/world/RegionManager.java

@@ -1,143 +0,0 @@
-package mc.world.generated_world.world;
-
-import lombok.Setter;
-import lombok.extern.slf4j.Slf4j;
-import mc.core.Direction;
-import mc.core.world.Region;
-import mc.core.world.World;
-import mc.core.world.WorldGenerator;
-import mc.world.generated_world.serialization.RegionReaderWriter;
-import org.springframework.beans.factory.annotation.Autowired;
-
-import java.io.File;
-import java.io.IOException;
-import java.text.MessageFormat;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
-
-import static mc.world.generated_world.WorldConstants.REGION_FILE_NAME_TEMPLATE;
-
-/*
-*       NORTH
-*
-*   EAST     WEST
-*
-*       SOUTH
-*
-*   + ----> X
-*   |
-*   |
-*   |
-*   V Z
-*/
-@Slf4j
-public class RegionManager {
-    private final World world;
-    private int pointX = -1;
-    private int pointZ = -1;
-    private int sizeX = 2;
-    private int sizeZ = 2;
-    private Region[][] regions = new Region[sizeX][sizeZ];
-    private final Lock regionSaveLock = new ReentrantLock();
-    @Autowired
-    private RegionReaderWriter regionReaderWriter;
-    @Autowired
-    private WorldGenerator worldGenerator;
-    @Setter
-    private boolean autoSaveRegionAfterGenerating = true;
-
-
-    public RegionManager(World world) {
-        this.world = world;
-    }
-
-    public void setRegion (Region region) {
-        int x = region.getX();
-        int z = region.getZ();
-
-        try {
-            regionSaveLock.lock();
-            regions[x - pointX][z - pointZ] = region;
-        } finally {
-            regionSaveLock.unlock();
-        }
-    }
-
-    private void checkCoordsInCache (int x, int z) {
-        if (x < pointX) {
-            addLines(Direction.EAST, pointX - x);
-        } else if (x > pointX + sizeX) {
-            addLines(Direction.WEST, x - (pointX + sizeX));
-        } else if (z < pointZ) {
-            addLines(Direction.NORTH, pointZ - z);
-        } else if (z > pointZ + sizeZ) {
-            addLines(Direction.SOUTH, z - (pointZ + sizeZ));
-        }
-    }
-
-    public Region getRegion (int x, int z) {
-        checkCoordsInCache(x, z);
-        Region region;
-        if (regions[x - pointX][z - pointZ] == null) {
-            File file = new File(new File("worlds", world.getWorldId().toString()), MessageFormat.format(REGION_FILE_NAME_TEMPLATE, x, z));
-            if (!file.exists()) {
-                region = worldGenerator.generateRegion(x, z, world);
-                if (autoSaveRegionAfterGenerating) {
-                    try {
-                        regionReaderWriter.write(region);
-                    } catch (IOException e) {
-                        log.error("Error occurred while saving region data");
-                    }
-                }
-            } else {
-                try {
-                    region = regionReaderWriter.read(x, z, world);
-                } catch (IOException e) {
-                    log.error("Error occurred while loading region");
-                    region = null;
-                }
-            }
-            setRegion(region);
-        } else {
-            region = regions[x - pointX][z - pointZ];
-        }
-        return region;
-    }
-
-    private void addLines (Direction direction, int amount) {
-        int addBeforeX = 0;
-        int addAfterX = 0;
-        int addBeforeZ = 0;
-        int addAfterZ = 0;
-        switch (direction) {
-            case NORTH:
-                addBeforeZ = amount;
-                break;
-            case EAST:
-                addBeforeX = amount;
-                break;
-            case WEST:
-                addAfterX = amount;
-                break;
-            case SOUTH:
-                addAfterZ = amount;
-                break;
-        }
-        try {
-            int tempSizeX = sizeX + addAfterX + addBeforeX;
-            int tempSizeZ = sizeZ + addAfterZ + addBeforeZ;
-            Region[][] temp = new Region[tempSizeX][tempSizeZ];
-            for (int x = 0; x < sizeX; x ++) {
-                System.arraycopy(regions[x], 0, temp[x + addBeforeX], addBeforeZ, sizeZ);
-            }
-
-            this.sizeX = tempSizeX;
-            this.sizeZ = tempSizeZ;
-            this.pointX = pointX - addBeforeX;
-            this.pointZ = pointZ - addBeforeZ;
-        } finally {
-            regionSaveLock.unlock();
-        }
-    }
-
-}

generated_world/src/test/java/mc/world/generated_world/SeedRandomGeneratorTest.java

@@ -1,6 +1,7 @@
 package mc.world.generated_world;
 
 import mc.world.generated_world.generator.SeedRandomGenerator;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import javax.imageio.ImageIO;
@@ -9,6 +10,7 @@ import java.io.File;
 
 import static org.junit.Assert.*;
 
+@Ignore
 public class SeedRandomGeneratorTest {
 
     @Test

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java

@@ -11,8 +11,8 @@ import lombok.extern.slf4j.Slf4j;
 import mc.core.network.NetOutputStream;
 import mc.core.network.SCPacket;
 import mc.core.network.proto_1_12_2.ByteArrayOutputNetStream;
+import mc.core.world.ChunkSection;
 import mc.core.world.block.Block;
-import mc.core.world.chunk.Chunk;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -76,7 +76,7 @@ public class ChunkDataPacket implements SCPacket {
     @Setter
     private boolean initChunk = true; // "Ground-Up Continuous"
     @Getter
-    private List<Chunk> chunks = new ArrayList<>();
+    private List<ChunkSection> chunks = new ArrayList<>();
 
     private int serializeBlockState(int id, int meta) {
         return (id << 4) | meta;
@@ -93,7 +93,7 @@ public class ChunkDataPacket implements SCPacket {
         int dataItems = 0;
         final int airBlockPalette = serializeBlockState(0, 0);
 
-        for (Chunk chunk : chunks) {
+        for (ChunkSection chunk : chunks) {
             final List<Integer> palette = new ArrayList<>();
             palette.add(airBlockPalette);
             final ByteArrayOutputNetStream dataArray = new ByteArrayOutputNetStream();

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/SpawnPositionPacket.java

@@ -8,7 +8,7 @@ import lombok.AllArgsConstructor;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import lombok.ToString;
-import mc.core.Location;
+import mc.core.EntityLocation;
 import mc.core.network.NetOutputStream;
 import mc.core.network.SCPacket;
 
@@ -17,17 +17,17 @@ import mc.core.network.SCPacket;
 @Setter
 @ToString
 public class SpawnPositionPacket implements SCPacket {
-    private Location location;
+    private EntityLocation location;
 
     private int floor_double(double value) {
         int i = (int)value;
         return value < (double)i ? i - 1 : i;
     }
 
-    private long location2long(Location location) {
+    private long location2long(EntityLocation entityLocation) {
-        return ((floor_double(location.getX()) & 0x3FFFFFF) << 38)
+        return ((floor_double(entityLocation.getX()) & 0x3FFFFFF) << 38)
-                | ((floor_double(location.getY()) & 0xFFF) << 26)
+                | ((floor_double(entityLocation.getY()) & 0xFFF) << 26)
-                | (floor_double(location.getZ()) & 0x3FFFFFF);
+                | (floor_double(entityLocation.getZ()) & 0x3FFFFFF);
     }
 
     @Override

proto_1.12.2_netty/src/main/java/mc/core/network/proto_1_12_2/netty/handlers/LoginHandler.java

@@ -61,7 +61,7 @@ public class LoginHandler extends AbstractStateHandler implements LoginStateHand
             pkt1.setMode(PlayerMode.CREATIVE);
             pkt1.setDimension(0/*Overworld*/);
             pkt1.setDifficulty(0/*Peaceful*/);
-            pkt1.setLevelType("flat");
+            pkt1.setLevelType("flat"); //FIXME
             channel.write(pkt1);
 
             // Spawn Position

settings.gradle

@@ -6,4 +6,4 @@ include('vanilla_commands')
 include('proto_1.12.2') // Protocol 1.12.2
 include('proto_1.12.2_netty') // Protocol 1.12.2 (Netty impl.)
 include('generated_world')
-
+include('event-loop')