Merged in forwolk/merge/location-world (pull request #6)

Forwolk/merge/location world

Approved-by: DmitriyMX <dimon550@gmail.com>
Approved-by: Daniil Glazko <daniil@glazko.su>

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

@@ -4,15 +4,20 @@
  */
 package mc.core;
 
-import lombok.AllArgsConstructor;
 import lombok.Data;
+import mc.core.exception.ResourceUnloadedException;
+import mc.core.world.Region;
+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;
 
-@AllArgsConstructor
 @Data
 public class Location implements Serializable{
     private double x, y, z;
+    private Reference<World> world;
 
     private static int floor_double(double value) {
         int i = (int)value;
@@ -23,16 +28,36 @@ public class Location implements Serializable{
         return new Location(
                 location.x,
                 location.y,
-                location.z
+                location.z,
+                location.getWorld()
         );
     }
 
+    public Location (double x, double y, double z, World world) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.world = new WeakReference<>(world);
+    }
+
+    public Location (double x, double y, double z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
     public static Location startPointLocation () {
-        return new Location(0,10,0);
+        return new Location(0,10,0, null);
     }
 
     public Location(long compactValue) {
         set(compactValue);
+        this.world = new WeakReference<>(null);
+    }
+
+    public Location(long compactValue, World world) {
+        set(compactValue);
+        this.world = new WeakReference<>(world);
     }
 
     public void set(double x, double y, double z) {
@@ -57,7 +82,8 @@ public class Location implements Serializable{
         return new Location(
                 this.x - location.x,
                 this.y - location.y,
-                this.z - location.z
+                this.z - location.z,
+                this.getWorld().equals(location.getWorld()) ? this.getWorld() : null
         );
     }
 
@@ -78,4 +104,24 @@ public class Location implements Serializable{
                 | ((floor_double(y) & 0xFFF) << 26)
                 | (floor_double(z) & 0x3FFFFFF);
     }
+
+    public World getWorld () {
+        if (world == null) {
+           return null;
+        }
+        if (world.get() == null) {
+            throw new ResourceUnloadedException("You're trying to get unloaded world");
+        }
+        return this.world.get();
+    }
+
+    public void setWorld (World world) {
+        this.world = new WeakReference<>(world);
+    }
+
+    public Chunk getChunk() {
+        Region region = getWorld().getRegion((int) (x / 256), (int) (z / 256));
+        return region.getChunk((int) ((x % 256) / 16), (int) ((z % 256) / 16));
+    }
+
 }

core/src/main/java/mc/core/WarpPosition.java

@@ -1,14 +1,90 @@
 package mc.core;
 
-import lombok.AllArgsConstructor;
+import mc.core.player.ILook;
-import lombok.Data;
 import mc.core.player.Look;
+import mc.core.world.World;
 
 import java.io.Serializable;
+import java.util.Objects;
 
-@Data
+public class WarpPosition extends Location implements Serializable, ILook {
-@AllArgsConstructor
+    private ILook look;
-public class WarpPosition implements Serializable {
+
-    private Location location;
+    public WarpPosition(double x, double y, double z, World world) {
-    private Look look;
+        super(x, y, z, world);
+    }
+
+    public WarpPosition(double x, double y, double z, float yaw, float pitch, World world) {
+        super(x, y, z, world);
+        this.look = new Look(yaw, pitch);
+    }
+
+    public WarpPosition(double x, double y, double z) {
+        super(x, y, z);
+    }
+
+    public WarpPosition(double x, double y, double z, float yaw, float pitch) {
+        super(x, y, z);
+        this.look = new Look(yaw, pitch);
+    }
+
+    public WarpPosition(long compactValue) {
+        super(compactValue);
+    }
+
+    public WarpPosition(Location location) {
+        super(location.getX(), location.getY(), location.getZ());
+    }
+
+    public WarpPosition(Location location, Look look) {
+        super(location.getX(), location.getY(), location.getZ());
+        this.look = look;
+    }
+
+    public WarpPosition(long compactValue, World world) {
+        super(compactValue, world);
+    }
+
+    @Override
+    public void set(Look look) {
+        this.look = look;
+    }
+
+    @Override
+    public float getYaw() {
+        return this.look.getYaw();
+    }
+
+    @Override
+    public void setYaw(float yaw) {
+        this.look.setYaw(yaw);
+    }
+
+    @Override
+    public float getPitch() {
+        return this.look.getPitch();
+    }
+
+    @Override
+    public void setPitch(float pitch) {
+        this.look.setPitch(pitch);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        if (!super.equals(o)) return false;
+        WarpPosition that = (WarpPosition) o;
+        return Objects.equals(look, that.look);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), look);
+    }
+
+    public boolean hasLook() {
+        return look != 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/player/ILook.java

@@ -0,0 +1,15 @@
+package mc.core.player;
+
+import java.io.Serializable;
+
+public interface ILook extends Serializable {
+    void set(Look look);
+
+    float getYaw();
+
+    float getPitch();
+
+    void setYaw(float yaw);
+
+    void setPitch(float pitch);
+}

core/src/main/java/mc/core/player/Look.java

@@ -7,13 +7,12 @@ package mc.core.player;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
-import java.io.Serializable;
-
 @Data
 @AllArgsConstructor
-public class Look implements Serializable{
+public class Look implements ILook {
     private float yaw, pitch;
 
+    @Override
     public void set(Look look) {
         this.yaw = look.yaw;
         this.pitch = look.pitch;

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.WarpPosition;
 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{
     WarpPosition getSpawn();
     void setSpawn(WarpPosition 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);
 }

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

@@ -11,7 +11,6 @@ import mc.core.Location;
 import mc.core.WarpPosition;
 import mc.core.player.Look;
 import mc.core.world.*;
-import mc.core.world.chunk.Chunk;
 
 import java.util.UUID;
 import java.util.stream.Stream;
@@ -28,7 +27,7 @@ public class FlatWorld implements World {
     @Getter
     @Setter
     private WarpPosition spawn = new WarpPosition(new Location(0, 6, 0), new Look(0, 0));
-    private Chunk chunk = new SimpleChunk(0, 0, 0); //FIXME temporary dummy
+    private ChunkSection chunkSection = new SimpleChunkSection();
 
     @Override
     public IWorldType getWorldType() {
@@ -36,12 +35,12 @@ 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

@@ -8,6 +8,7 @@ import mc.core.Direction;
 import mc.core.Location;
 import mc.core.WarpPosition;
 import mc.core.player.Look;
+import mc.core.world.ChunkSection;
 import mc.core.world.IWorldType;
 import mc.core.world.Region;
 import mc.core.world.World;
@@ -105,13 +106,13 @@ public class CubicWorld implements World {
     }
 
     @Override
-    public Chunk getChunk(int x, int y, int z) {
+    public ChunkSection getChunk(int x, int y, int z) {
         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) {
 
     }
 

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

@@ -48,7 +48,7 @@ public class LoginHandler extends AbstractStateHandler implements LoginStateHand
             Player player = playerManager.getPlayer(packet.getPlayerName())
                     .orElseGet(() -> playerManager.createPlayer(
                             packet.getPlayerName(),
-                            world.getSpawn().getLocation(),
+                            world.getSpawn(),
                             new Look(0f, 0f)));
 
             channel.writeAndFlush(new LoginSuccessPacket(
@@ -68,7 +68,7 @@ public class LoginHandler extends AbstractStateHandler implements LoginStateHand
 
             // Spawn Position
             SpawnPositionPacket pkt2 = new SpawnPositionPacket();
-            pkt2.setLocation(world.getSpawn().getLocation());
+            pkt2.setLocation(world.getSpawn());
             channel.write(pkt2);
 
             // Player Abilities