update version

like Spring Data

build.gradle

@@ -14,9 +14,12 @@ repositories {
     mavenLocal()
     mavenCentral()
     maven { url 'https://hub.spigotmc.org/nexus/content/groups/public' }
+    maven { url 'https://dmx-mc-project.gitlab.io/maven-repository/' }
 }
 
 ext {
+    junitVersion = '5.5.2'
+
     libs = [
             bukkit: [lib: 'org.bukkit:bukkit:1.12.2-R0.1-SNAPSHOT', exclude: [
                     'com.google.code.gson:gson',
@@ -24,7 +27,19 @@ ext {
                     'commons-lang:commons-lang',
                     'org.yaml:snakeyaml'
             ]],
-            lombok: 'org.projectlombok:lombok:1.18.12'
+            commons_text: 'org.apache.commons:commons-text:1.9',
+            lombok: 'org.projectlombok:lombok:1.18.12',
+            reflection_object: 'ru.dmitriymx:reflection-object:1.0-BETA',
+            mysql: 'mysql:mysql-connector-java:8.0.22',
+            test: [
+                    junit5: [
+                            "org.junit.jupiter:junit-jupiter-api:$junitVersion",
+                            "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
+                    ],
+                    mock: ['org.mockito:mockito-core:1.10.19'],
+                    h2db: 'com.h2database:h2:1.4.200'
+            ]
+
     ]
 }
 
@@ -37,9 +52,30 @@ def compileOnly2(library) {
     }
 }
 
+def testImplementation2(library) {
+    dependencies.testImplementation library.lib, {
+        library.exclude.each { String excludeLibStr ->
+            String[] excludeLib = excludeLibStr.split(':')
+            exclude group: excludeLib[0], module: excludeLib[1]
+        }
+    }
+}
+
 dependencies {
     compileOnly libs.lombok
     annotationProcessor libs.lombok
 
     compileOnly2 libs.bukkit
+    compileOnly libs.mysql
+    implementation libs.commons_text
+    implementation libs.reflection_object
+
+    testImplementation libs.test.junit5
+    testImplementation libs.test.mock
+    testImplementation2 libs.bukkit
+    testImplementation libs.test.h2db
+}
+
+test {
+    useJUnitPlatform()
 }

gradle.properties

@@ -1,3 +1,3 @@
 projectGroup=ghast
 projectName=ghast-tools
-projectVersion=1.3
+projectVersion=1.9

src/main/java/ghast/EffectsHelper.java

@@ -0,0 +1,27 @@
+package ghast;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.Location;
+import org.bukkit.Particle;
+import org.bukkit.Sound;
+import org.bukkit.SoundCategory;
+import org.bukkit.util.Vector;
+
+@UtilityClass
+@SuppressWarnings("unused")
+public class EffectsHelper {
+
+	public void playSound(Location location, Sound sound, float pitch) {
+		location.getWorld().playSound(location, sound, SoundCategory.MASTER, 1.0f, pitch);
+	}
+
+	public void particle(Location location, Particle particle, double dx, double dy, double dz, double speed, int amount) {
+		location.getWorld().spawnParticle(particle, location, amount, dx, dy, dz, speed);
+	}
+
+	//TODO нужно проверить
+	public void particle(Location location, Particle particle, Vector vector, double speed, int amount) {
+		particle(location, particle, vector.getX(), vector.getY(), vector.getZ(), speed, amount);
+	}
+}
+

src/main/java/ghast/EventContext.java

@@ -3,6 +3,7 @@ package ghast;
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
 import org.bukkit.Bukkit;
+import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
@@ -17,6 +18,7 @@ import java.util.function.Consumer;
 public class EventContext implements Listener {
 
 	private static final BooleanSupplier EMPTY_FILTER = () -> true;
+	private static final Consumer<Cancellable> CANCEL_EVENT = event -> event.setCancelled(true);
 
 	private final Map<Class<? extends Event>, Consumer<?>> eventMap = new HashMap<>();
 	private BooleanSupplier filter = EMPTY_FILTER;
@@ -31,8 +33,7 @@ public class EventContext implements Listener {
 			eventMap.remove(eventType);
 		} else {
 			eventMap.put(eventType, consumer);
-			Bukkit.getPluginManager().registerEvent(eventType, this, eventPriority,
+			bukkitRegisterEvent(eventType, eventPriority);
-					this::eventExecute, GhastTools.getPlugin());
 		}
 		return this;
 	}
@@ -41,6 +42,21 @@ public class EventContext implements Listener {
 		return onEvent(eventType, EventPriority.NORMAL, consumer);
 	}
 
+	public <T extends Event & Cancellable> EventContext cancelEvent(Class<T> eventType, EventPriority eventPriority) {
+		eventMap.put(eventType, CANCEL_EVENT);
+		bukkitRegisterEvent(eventType, eventPriority);
+		return this;
+	}
+
+	public <T extends Event & Cancellable> EventContext cancelEvent(Class<T> eventType) {
+		return cancelEvent(eventType, EventPriority.NORMAL);
+	}
+
+	private void bukkitRegisterEvent(Class<? extends Event> eventType, EventPriority eventPriority) {
+		Bukkit.getPluginManager().registerEvent(eventType, this, eventPriority,
+				this::eventExecute, GhastTools.getPlugin());
+	}
+
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	private void eventExecute(Listener listener, Event event) {
 		Consumer consumer = eventMap.get(event.getClass());

src/main/java/ghast/GhastTools.java

@@ -1,5 +1,6 @@
 package ghast;
 
+import ghast.assets.AssetsManager;
 import lombok.experimental.UtilityClass;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.plugin.Plugin;
@@ -23,6 +24,20 @@ public class GhastTools {
 		}
 	}
 
+	@SuppressWarnings("java:S112")
+	public Plugin getPlugin() {
+		if (refPlugin == null) {
+			throw new RuntimeException("Plugin not set.");
+		}
+
+		Plugin plugin = refPlugin.get();
+		if (plugin == null) {
+			throw new RuntimeException("Plugin not set.");
+		}
+
+		return plugin;
+	}
+
 	@SuppressWarnings("java:S112")
 	public YamlConfiguration loadConfig(boolean saveDefault) {
 		if (saveDefault) {
@@ -39,18 +54,4 @@ public class GhastTools {
 	public YamlConfiguration loadConfig() {
 		return loadConfig(true);
 	}
-
-	@SuppressWarnings("java:S112")
-	Plugin getPlugin() {
-		if (refPlugin == null) {
-			throw new RuntimeException("Plugin not set.");
-		}
-
-		Plugin plugin = refPlugin.get();
-		if (plugin == null) {
-			throw new RuntimeException("Plugin not set.");
-		}
-
-		return plugin;
-	}
 }

src/main/java/ghast/I18n.java

@@ -0,0 +1,91 @@
+package ghast;
+
+import com.google.common.collect.HashBasedTable;
+import com.google.common.collect.Table;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.experimental.UtilityClass;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.text.StringSubstitutor;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.HashMap;
+import java.util.Map;
+
+@UtilityClass
+@SuppressWarnings("unused")
+public class I18n {
+
+	private final String DEFAULT_LANG = "en";
+	private final Table<String/*Lang*/, String/*Key*/, String/*Template|Message*/> messagesMap = HashBasedTable.create();
+
+	//region Load messages
+	@SuppressWarnings("java:S112")
+	public void loadMessages(String lang, Reader reader) {
+		Map<String, String> map = messagesMap.row(lang.toLowerCase());
+
+		try {
+			BufferedReader bufferedReader = new BufferedReader(reader);
+			String line;
+			while ((line = bufferedReader.readLine()) != null) {
+				String[] split = line.split("=", 2);
+				map.put(split[0].trim().toLowerCase(), split[1].trim());
+			}
+		} catch (IOException e) {
+			throw new RuntimeException("Error load messages: " + e.getMessage(), e);
+		}
+	}
+
+	public void loadMessages(String lang, Map<String, String> messages) {
+		Map<String, String> map = messagesMap.row(lang.toLowerCase());
+		messages.forEach((k, v) -> map.put(k.toLowerCase(), v));
+	}
+
+	public void loadMessages(Reader reader) {
+		loadMessages(DEFAULT_LANG, reader);
+	}
+
+	public void loadMessages(Map<String, String> messages) {
+		loadMessages(DEFAULT_LANG, messages);
+	}
+	//endregion
+
+	//region Get message
+	public String get(String lang, String key) {
+		return messagesMap.row(lang.toLowerCase()).getOrDefault(key.toLowerCase(), StringUtils.EMPTY);
+	}
+
+	public String get(String lang, String key, Map<String, Object> params) {
+		return StringSubstitutor.replace(get(lang, key.toLowerCase()), params, "{", "}");
+	}
+
+	public String get(String key) {
+		return get(DEFAULT_LANG, key);
+	}
+
+	public String get(String key, Map<String, Object> params) {
+		return get(DEFAULT_LANG, key, params);
+	}
+	//endregion
+
+	public ParamBuilder paramBuilder() {
+		return new ParamBuilder();
+	}
+
+	@NoArgsConstructor(access = AccessLevel.PRIVATE)
+	public static class ParamBuilder {
+
+		private final Map<String, Object> params = new HashMap<>();
+
+		public ParamBuilder add(String key, Object value) {
+			params.put(key, value);
+			return this;
+		}
+
+		public Map<String, Object> build() {
+			return params;
+		}
+	}
+}

src/main/java/ghast/XLog.java

@@ -0,0 +1,77 @@
+package ghast;
+
+import lombok.experimental.UtilityClass;
+
+import java.util.logging.Level;
+
+import static java.text.MessageFormat.format;
+
+@UtilityClass
+@SuppressWarnings("unused")
+public class XLog {
+
+	//region Debug
+	public void debug(String pattern, Object... objects) {
+		if (objects.length > 1 && objects[objects.length - 1] instanceof Throwable) {
+			Throwable throwable = (Throwable) objects[objects.length - 1];
+			Object[] values = new Object[objects.length - 1];
+			System.arraycopy(objects, 0, values, 0, values.length);
+
+			debug(format(pattern, values), throwable);
+		} else {
+			debug(format(pattern, objects));
+		}
+	}
+
+	public void debug(String message, Throwable throwable) {
+		GhastTools.getPlugin().getLogger().log(Level.FINE, message, throwable);
+	}
+
+	public void debug(String message) {
+		GhastTools.getPlugin().getLogger().fine(message);
+	}
+	//endregion
+
+	//region Info
+	public void info(String pattern, Object... objects) {
+		info(format(pattern, objects));
+	}
+
+	public void info(String message) {
+		GhastTools.getPlugin().getLogger().info(message);
+	}
+	//endregion
+
+	//region Warning
+	public void warn(String pattern, Object... objects) {
+		warn(format(pattern, objects));
+	}
+
+	public void warn(String message) {
+		GhastTools.getPlugin().getLogger().warning(message);
+	}
+	//endregion
+
+	//region Error
+	public void error(String pattern, Object... objects) {
+		if (objects.length > 1 && objects[objects.length - 1] instanceof Throwable) {
+			Throwable throwable = (Throwable) objects[objects.length - 1];
+			Object[] values = new Object[objects.length - 1];
+			System.arraycopy(objects, 0, values, 0, values.length);
+
+			error(format(pattern, values), throwable);
+		} else {
+			error(format(pattern, objects));
+		}
+	}
+
+	public void error(String message) {
+		GhastTools.getPlugin().getLogger().severe(message);
+	}
+
+	public void error(String message, Throwable throwable) {
+		GhastTools.getPlugin().getLogger().log(Level.SEVERE, message, throwable);
+	}
+	//endregion
+
+}

src/main/java/ghast/assets/AssetsException.java

@@ -1,4 +1,4 @@
-package ghast;
+package ghast.assets;
 
 public class AssetsException extends RuntimeException {
 

src/main/java/ghast/assets/AssetsManager.java

@@ -1,5 +1,6 @@
-package ghast;
+package ghast.assets;
 
+import ghast.GhastTools;
 import lombok.experimental.UtilityClass;
 import org.bukkit.plugin.Plugin;
 

src/main/java/ghast/command/CommandExecuter.java

@@ -0,0 +1,8 @@
+package ghast.command;
+
+import org.bukkit.command.CommandSender;
+
+public interface CommandExecuter {
+
+	void execute(CommandSender sender, String[] args);
+}

src/main/java/ghast/command/CommandManager.java

@@ -0,0 +1,71 @@
+package ghast.command;
+
+import lombok.AccessLevel;
+import lombok.RequiredArgsConstructor;
+import lombok.experimental.UtilityClass;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import ru.dmitriymx.reflection.ReflectionObject;
+
+@UtilityClass
+@SuppressWarnings("unused")
+public class CommandManager {
+
+	public Builder create(String name) {
+		return new Builder(name);
+	}
+
+	public void register(String name, CommandExecuter executer) {
+		create(name).executer(executer).register();
+	}
+
+	@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+	public static class Builder {
+
+		private final String name;
+		private CommandExecuter executer;
+		private ErrorConsumer errorConsumer;
+		private Boolean onlyPlayer;
+		private String deniedMessage;
+
+		public Builder executer(CommandExecuter executer) {
+			this.executer = executer;
+			return this;
+		}
+
+		public Builder onError(ErrorConsumer errorConsumer) {
+			this.errorConsumer = errorConsumer;
+			return this;
+		}
+
+		public Builder useOnlyPlayer(String deniedMessage) {
+			this.onlyPlayer = true;
+			this.deniedMessage = deniedMessage;
+			return this;
+		}
+
+		public Builder useOnlyPlayer() {
+			return useOnlyPlayer(null);
+		}
+
+		public Builder useOnlyConsole(String deniedMessage) {
+			this.onlyPlayer = false;
+			this.deniedMessage = deniedMessage;
+			return this;
+		}
+
+		public Builder useOnlyConsole() {
+			return useOnlyConsole(null);
+		}
+
+		public void register() {
+			//TODO для Paper такие "извращения" не требуются. Нужно продумать.
+			new ReflectionObject(Bukkit.getServer())
+					.method("getCommandMap").invoke()
+					.method("register", String.class, Command.class).invoke(
+						name, new CommandWrapper(name, this.onlyPlayer, this.deniedMessage,
+							this.executer, this.errorConsumer)
+					);
+		}
+	}
+}

src/main/java/ghast/command/CommandWrapper.java

@@ -0,0 +1,71 @@
+package ghast.command;
+
+import ghast.XLog;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.defaults.BukkitCommand;
+import org.bukkit.entity.Player;
+
+class CommandWrapper extends BukkitCommand {
+
+	private static final String DEFAULT_DENIED_MESSAGE_PLAYERS = ChatColor.RED + "This command use only players";
+	private static final String DEFAULT_DENIED_MESSAGE_CONSOLE = ChatColor.RED + "This command use only in console";
+
+	private static final ErrorConsumer DEFAULT_ERROR_CONSUMER =
+			(sender, commandName, args, exception) -> {
+				sender.sendMessage(String.format("%sError execute command '%s'!", ChatColor.RED, commandName));
+				XLog.error("Error execute command ''{0}'' with args ''{1}''",
+						commandName, String.join(" ", args), exception);
+			};
+
+	private final CommandExecuter executer;
+	private final ErrorConsumer errorConsumer;
+	private final Boolean onlyPlayer;
+	private String deniedMessage;
+
+	protected CommandWrapper(String name, Boolean onlyPlayer, String deniedMessage,
+			CommandExecuter executer, ErrorConsumer errorConsumer) {
+		super(name);
+		this.onlyPlayer = onlyPlayer;
+		this.executer = executer;
+
+		if (onlyPlayer != null) {
+			if (deniedMessage == null) {
+				this.deniedMessage = Boolean.TRUE.equals(onlyPlayer) ? DEFAULT_DENIED_MESSAGE_PLAYERS
+						: DEFAULT_DENIED_MESSAGE_CONSOLE;
+			} else {
+				this.deniedMessage = deniedMessage;
+			}
+		}
+
+		if(errorConsumer == null) {
+			this.errorConsumer = DEFAULT_ERROR_CONSUMER;
+		} else {
+			this.errorConsumer = errorConsumer;
+		}
+	}
+
+	@Override
+	@SuppressWarnings("java:S1066")
+	public boolean execute(CommandSender commandSender, String commandName, String[] args) {
+		if (Boolean.TRUE.equals(onlyPlayer)) {
+			if (!(commandSender instanceof Player)) {
+				commandSender.sendMessage(deniedMessage);
+				return true;
+			}
+		} else if (Boolean.FALSE.equals(onlyPlayer)) { // use console only
+			if (commandSender instanceof Player) {
+				commandSender.sendMessage(deniedMessage);
+				return true;
+			}
+		}
+
+		try {
+			executer.execute(commandSender, args);
+			return true;
+		} catch (Exception e) {
+			errorConsumer.accept(commandSender, commandName, args, e);
+			return false;
+		}
+	}
+}

src/main/java/ghast/command/ErrorConsumer.java

@@ -0,0 +1,8 @@
+package ghast.command;
+
+import org.bukkit.command.CommandSender;
+
+public interface ErrorConsumer {
+
+	void accept(CommandSender sender, String commandName, String[] args, Exception exception);
+}

src/main/java/ghast/database/CannotGetJdbcConnectionException.java

@@ -0,0 +1,10 @@
+package ghast.database;
+
+import java.sql.SQLException;
+
+public class CannotGetJdbcConnectionException extends DataAccessException {
+
+	public CannotGetJdbcConnectionException(String msg, SQLException ex) {
+		super(msg, ex);
+	}
+}

src/main/java/ghast/database/DataAccessException.java

@@ -0,0 +1,28 @@
+package ghast.database;
+
+import lombok.Getter;
+
+@SuppressWarnings("java:S1165")
+@Getter
+public class DataAccessException extends RuntimeException {
+
+	private String sql;
+
+	public DataAccessException(String msg) {
+		super(msg);
+	}
+
+	public DataAccessException(String msg, String sql) {
+		this(msg);
+		this.sql = sql;
+	}
+
+	public DataAccessException(String msg, Throwable cause) {
+		super(msg, cause);
+	}
+
+	public DataAccessException(String msg, String sql, Throwable cause) {
+		this(msg, cause);
+		this.sql = sql;
+	}
+}

src/main/java/ghast/database/EmptyResultDataAccessException.java

@@ -0,0 +1,8 @@
+package ghast.database;
+
+public class EmptyResultDataAccessException extends IncorrectResultSizeDataAccessException {
+
+	public EmptyResultDataAccessException(int expectedSize) {
+		super(expectedSize);
+	}
+}

src/main/java/ghast/database/IncorrectResultSizeDataAccessException.java

@@ -0,0 +1,8 @@
+package ghast.database;
+
+public class IncorrectResultSizeDataAccessException extends DataAccessException {
+
+	public IncorrectResultSizeDataAccessException(int expectedSize) {
+		super("Incorrect result size: expected " + expectedSize);
+	}
+}

src/main/java/ghast/database/JdbcOperations.java

@@ -0,0 +1,23 @@
+package ghast.database;
+
+import java.util.List;
+import java.util.Map;
+
+public interface JdbcOperations {
+
+	void execute(String sql) throws DataAccessException;
+
+	<T> T query(String sql, ResultSetExtractor<T> rse) throws DataAccessException;
+
+	<T> List<T> query(String sql, RowMapper<T> rowMapper) throws DataAccessException;
+
+	<T> T queryForObject(String sql, RowMapper<T> rowMapper) throws DataAccessException;
+
+	Map<String, Object> queryForMap(String sql) throws DataAccessException;
+
+	List<Map<String, Object>> queryForList(String sql) throws DataAccessException;
+
+	int update(String sql) throws DataAccessException;
+
+	int delete(String sql) throws DataAccessException;
+}

src/main/java/ghast/database/JdbcTemplate.java

@@ -0,0 +1,237 @@
+package ghast.database;
+
+import ghast.XLog;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import javax.sql.DataSource;
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+@NoArgsConstructor
+@Getter
+@Setter
+public class JdbcTemplate implements JdbcOperations {
+
+	private DataSource dataSource;
+
+	public JdbcTemplate(DataSource dataSource) {
+		setDataSource(dataSource);
+	}
+
+	@Override
+	public void execute(String sql) throws DataAccessException {
+		XLog.debug("Execute SQL: {0}", sql);
+
+		Connection connection = openConnection();
+		Statement statement = null;
+		try {
+			statement = connection.createStatement();
+			statement.execute(sql);
+		} catch (SQLException e) {
+			throw new DataAccessException("Error execute SQL", sql, e);
+		} finally {
+			closeStatement(statement);
+			closeConnection(connection);
+		}
+	}
+
+	@Override
+	public <T> T query(String sql, ResultSetExtractor<T> rse) throws DataAccessException {
+		XLog.debug("Execute SQL: {0}", sql);
+
+		Connection connection = openConnection();
+		Statement statement = null;
+		ResultSet resultSet = null;
+		try {
+			statement = connection.createStatement();
+			resultSet = statement.executeQuery(sql);
+			return rse.extractData(resultSet);
+		} catch (SQLException e) {
+			throw new DataAccessException("Error execute SQL", sql, e);
+		} finally {
+			closeResultSet(resultSet);
+			closeStatement(statement);
+			closeConnection(connection);
+		}
+	}
+
+	@Override
+	public <T> List<T> query(String sql, final RowMapper<T> rowMapper) throws DataAccessException {
+		return query(sql, rs -> {
+			List<T> resultList = new ArrayList<>();
+			int rowNum = 0;
+			while (rs.next()) {
+				resultList.add(rowMapper.mapRow(rs, rowNum++));
+			}
+			return resultList;
+		});
+	}
+
+	@Override
+	public <T> T queryForObject(String sql, RowMapper<T> rowMapper) throws DataAccessException {
+		return query(sql, rs -> {
+			if (rs.next()) {
+				T resultObj = rowMapper.mapRow(rs, 0);
+
+				if (rs.next()) {
+					throw new IncorrectResultSizeDataAccessException(1);
+				}
+
+				return resultObj;
+			} else {
+				throw new EmptyResultDataAccessException(1);
+			}
+		});
+	}
+
+	@Override
+	public Map<String, Object> queryForMap(String sql) throws DataAccessException {
+		return queryForObject(sql, (rs, rowNum) -> {
+			ResultSetMetaData metaData = rs.getMetaData();
+			int columnCount = metaData.getColumnCount();
+			Map<String, Object> resultMap = new LinkedHashMap<>(columnCount);
+
+			for (int i = 1; i <= columnCount; i++) {
+				String key = lookupColumnName(metaData, i);
+				Object value = getResultSetRawValue(rs, i);
+				resultMap.put(key, value);
+			}
+
+			return resultMap;
+		});
+	}
+
+	@Override
+	public List<Map<String, Object>> queryForList(String sql) throws DataAccessException {
+		return query(sql, (rs, rowNum) -> {
+			ResultSetMetaData metaData = rs.getMetaData();
+			int columnCount = metaData.getColumnCount();
+			Map<String, Object> resultMap = new LinkedHashMap<>(columnCount);
+
+			for (int i = 1; i <= columnCount; i++) {
+				String key = lookupColumnName(metaData, i);
+				Object value = getResultSetRawValue(rs, i);
+				resultMap.put(key, value);
+			}
+
+			return resultMap;
+		});
+	}
+
+	@Override
+	public int update(String sql) throws DataAccessException {
+		XLog.debug("Execute SQL: {0}", sql);
+
+		Connection connection = openConnection();
+		Statement statement = null;
+		try {
+			statement = connection.createStatement();
+			int rows = statement.executeUpdate(sql);
+			XLog.debug("Affected {0} rows", rows);
+			return rows;
+		} catch (SQLException e) {
+			XLog.error("Error execute SQL: {0}", e.getMessage(), e);
+			return 0;
+		} finally {
+			closeStatement(statement);
+			closeConnection(connection);
+		}
+	}
+
+	@Override
+	public int delete(String sql) throws DataAccessException {
+		return update(sql);
+	}
+
+	private Connection openConnection() {
+		try {
+			return getDataSource().getConnection();
+		}
+		catch (SQLException ex) {
+			throw new CannotGetJdbcConnectionException("Could not get JDBC Connection", ex);
+		}
+	}
+
+	private String lookupColumnName(ResultSetMetaData resultSetMetaData, int columnIndex) throws SQLException {
+		String name = resultSetMetaData.getColumnLabel(columnIndex);
+		if (name == null || name.isEmpty()) {
+			name = resultSetMetaData.getColumnName(columnIndex);
+		}
+		return name;
+	}
+
+	private Object getResultSetRawValue(ResultSet resultSet, int index) throws SQLException {
+		Object obj = resultSet.getObject(index);
+		String className = null;
+		if (obj != null) {
+			className = obj.getClass().getName();
+		}
+
+		if (obj instanceof Blob) {
+			Blob blob = (Blob) obj;
+			obj = blob.getBytes(1, (int) blob.length());
+		} else if (obj instanceof Clob) {
+			Clob clob = (Clob) obj;
+			obj = clob.getSubString(1, (int) clob.length());
+		} else if ("oracle.sql.TIMESTAMP".equals(className) || "oracle.sql.TIMESTAMPTZ".equals(className)) {
+			obj = resultSet.getTimestamp(index);
+		} else if (className != null && className.startsWith("oracle.sql.DATE")) {
+			String metaDataClassName = resultSet.getMetaData().getColumnClassName(index);
+			if ("java.sql.Timestamp".equals(metaDataClassName) || "oracle.sql.TIMESTAMP".equals(metaDataClassName)) {
+				obj = resultSet.getTimestamp(index);
+			}
+			else {
+				obj = resultSet.getDate(index);
+			}
+		} else if (obj instanceof Date) {
+			if ("java.sql.Timestamp".equals(resultSet.getMetaData().getColumnClassName(index))) {
+				obj = resultSet.getTimestamp(index);
+			}
+		}
+
+		return obj;
+	}
+
+	private void closeResultSet(ResultSet resultSet) {
+		if (resultSet != null) {
+			try {
+				resultSet.close();
+			} catch (SQLException e) {
+				XLog.debug("Could not close JDBC ResultSet", e);
+			} catch (Exception e) {
+				XLog.debug("Unexpected exception on closing JDBC ResultSet", e);
+			}
+		}
+	}
+
+	private void closeStatement(Statement statement) {
+		if (statement != null) {
+			try {
+				statement.close();
+			} catch (SQLException e) {
+				XLog.debug("Could not close JDBC Statement", e);
+			} catch (Exception e) {
+				XLog.debug("Unexpected exception on closing JDBC Statement", e);
+			}
+		}
+	}
+
+	private void closeConnection(Connection con) {
+		if (con == null) {
+			return;
+		}
+
+		try {
+			con.close();
+		} catch (SQLException e) {
+			XLog.debug("Could not close JDBC Connection", e);
+		} catch (Exception e) {
+			XLog.debug("Unexpected exception on closing JDBC Connection", e);
+		}
+	}
+}

src/main/java/ghast/database/ResultSetExtractor.java

@@ -0,0 +1,9 @@
+package ghast.database;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public interface ResultSetExtractor<T> {
+
+	T extractData(ResultSet rs) throws SQLException, DataAccessException;
+}

src/main/java/ghast/database/RowMapper.java

@@ -0,0 +1,9 @@
+package ghast.database;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public interface RowMapper<T> {
+
+	T mapRow(ResultSet rs, int rowNum) throws SQLException;
+}

src/main/java/ghast/scheduler/BukkitScheduleTask.java

@@ -0,0 +1,33 @@
+package ghast.scheduler;
+
+import lombok.RequiredArgsConstructor;
+import org.bukkit.scheduler.BukkitTask;
+
+import java.util.function.Supplier;
+
+@RequiredArgsConstructor
+public class BukkitScheduleTask implements ScheduleTask {
+
+	private final Supplier<BukkitTask> generator;
+	private BukkitTask bukkitTask;
+
+	@Override
+	public void start() {
+		if (isCanceled()) {
+			bukkitTask = generator.get();
+		}
+	}
+
+	@Override
+	public boolean isCanceled() {
+		return bukkitTask == null || bukkitTask.isCancelled();
+	}
+
+	@Override
+	public void cancel() {
+		if (bukkitTask != null) {
+			bukkitTask.cancel();
+			bukkitTask = null;
+		}
+	}
+}

src/main/java/ghast/scheduler/JavaScheduleTask.java

@@ -0,0 +1,33 @@
+package ghast.scheduler;
+
+import lombok.RequiredArgsConstructor;
+
+import java.util.concurrent.Future;
+import java.util.function.Supplier;
+
+@RequiredArgsConstructor
+public class JavaScheduleTask implements ScheduleTask {
+
+	private final Supplier<Future<?>> generator;
+	private Future<?> future;
+
+	@Override
+	public void start() {
+		if (future == null || future.isDone()) {
+			future = generator.get();
+		}
+	}
+
+	@Override
+	public boolean isCanceled() {
+		return future == null || future.isCancelled();
+	}
+
+	@Override
+	public void cancel() {
+		if (future != null) {
+			future.cancel(true);
+			future = null;
+		}
+	}
+}

src/main/java/ghast/scheduler/ScheduleManager.java

@@ -1,6 +1,7 @@
-package ghast;
+package ghast.scheduler;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import ghast.GhastTools;
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
 import lombok.experimental.UtilityClass;
@@ -45,48 +46,68 @@ public class ScheduleManager {
 			return this;
 		}
 
-		public void execute(Runnable runnable) {
+		public ScheduleTask create(Runnable runnable) {
 			if (useBukkitScheduler) {
-				createBukkitSchedule(runnable);
+				return createBukkitSchedule(runnable);
 			} else {
-				createSchedule(runnable);
+				return createSchedule(runnable);
 			}
 		}
 
-		private void createBukkitSchedule(Runnable runnable) {
+		public ScheduleTask execute(Runnable runnable) {
+			ScheduleTask scheduleTask = create(runnable);
+			scheduleTask.start();
+			return scheduleTask;
+		}
+
+		private ScheduleTask createBukkitSchedule(Runnable runnable) {
 			BukkitScheduler bukkitScheduler = Bukkit.getScheduler();
+			BukkitScheduleTask resultTask;
 
 			if (this.afterMs == null && this.everyMs == null) {
-				bukkitScheduler.runTask(GhastTools.getPlugin(), runnable);
+				resultTask = new BukkitScheduleTask(() -> bukkitScheduler.runTask(GhastTools.getPlugin(), runnable));
 			} else if (this.everyMs != null) {
 				long everyTicks = this.everyMs / MS_PER_ONE_TICK;
 				long afterTicks = this.afterMs != null ? this.afterMs / MS_PER_ONE_TICK : 0;
-				bukkitScheduler.runTaskTimer(GhastTools.getPlugin(), runnable, afterTicks, everyTicks);
+				resultTask = new BukkitScheduleTask(() ->
+						bukkitScheduler.runTaskTimer(GhastTools.getPlugin(), runnable, afterTicks, everyTicks));
 			} else {
 				long ticks = this.afterMs / MS_PER_ONE_TICK;
-				bukkitScheduler.runTaskLater(GhastTools.getPlugin(), runnable, ticks);
+				resultTask = new BukkitScheduleTask(() ->
+						bukkitScheduler.runTaskLater(GhastTools.getPlugin(), runnable, ticks));
 			}
+
+			return resultTask;
 		}
 
-		private void createSchedule(Runnable runnable) {
+		private ScheduleTask createSchedule(Runnable runnable) {
 			ExecutorService executorService;
+			JavaScheduleTask resultTask;
 
 			if (this.afterMs == null && this.everyMs == null) {
 				executorService = Executors.newSingleThreadExecutor(THREAD_FACTORY);
-				executorService.execute(runnable);
+				resultTask = new JavaScheduleTask(() -> executorService.submit(runnable));
 			} else if (this.everyMs != null) {
-				ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1, THREAD_FACTORY);
+				ScheduledExecutorService scheduledExecutorService
-				scheduledExecutorService.scheduleAtFixedRate(runnable,
+						= Executors.newScheduledThreadPool(1, THREAD_FACTORY);
-						this.afterMs != null ? this.afterMs : 0,
+
-						everyMs, TimeUnit.MILLISECONDS);
+				resultTask = new JavaScheduleTask(() ->
+						scheduledExecutorService.scheduleAtFixedRate(runnable,
+								this.afterMs != null ? this.afterMs : 0,
+								everyMs, TimeUnit.MILLISECONDS));
+
 				executorService = scheduledExecutorService;
 			} else {
-				ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1, THREAD_FACTORY);
+				ScheduledExecutorService scheduledExecutorService
-				scheduledExecutorService.schedule(runnable, afterMs, TimeUnit.MILLISECONDS);
+						= Executors.newScheduledThreadPool(1, THREAD_FACTORY);
+
+				resultTask = new JavaScheduleTask(() ->
+						scheduledExecutorService.schedule(runnable, afterMs, TimeUnit.MILLISECONDS));
 				executorService = scheduledExecutorService;
 			}
 
 			executorService.shutdown();
+			return resultTask;
 		}
 	}
 }

src/main/java/ghast/scheduler/ScheduleTask.java

@@ -0,0 +1,10 @@
+package ghast.scheduler;
+
+public interface ScheduleTask {
+
+	void start();
+
+	boolean isCanceled();
+
+	void cancel();
+}

src/test/java/ghast/database/JdbcTemplateTest.java

@@ -0,0 +1,245 @@
+package ghast.database;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import ghast.GhastTools;
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.bukkit.plugin.Plugin;
+import org.h2.jdbcx.JdbcDataSource;
+import org.junit.jupiter.api.*;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.text.MessageFormat;
+import java.util.List;
+import java.util.Map;
+import java.util.StringJoiner;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class JdbcTemplateTest {
+
+	static final String JDBC_USER = "sa";
+	static final String JDBC_PASSWORD = "";
+	static final String JDBC_DB_NAME = "in_mem_db";
+	static final String JDBC_URL = "jdbc:h2:mem:" + JDBC_DB_NAME + ";DB_CLOSE_DELAY=-1";
+
+	static final String TABLE_NAME = "TEST_TABLE";
+	static final String COLUMN_ID = "ID";
+	static final String COLUMN_NAME = "C_NAME";
+	static final String COLUMN_VALUE = "C_VALUE";
+
+	static final Object[][] DATA = new Object[][]{
+			{ "Player 1", 100 }, { "Player 2", 250 },
+			{ "Player 3", 0 }, { "Player 4", 780 }
+	};
+
+	static DataSource dataSource;
+	JdbcTemplate jdbcTemplate;
+
+	@BeforeAll
+	static void beforeAll() {
+		Logger logger = Logger.getLogger(JdbcTemplateTest.class.getName());
+
+		Plugin mockPlugin = mock(Plugin.class);
+		when(mockPlugin.getLogger()).thenReturn(logger);
+
+		GhastTools.setPlugin(mockPlugin);
+
+		JdbcDataSource jdbcDataSource = new JdbcDataSource();
+		jdbcDataSource.setUser(JDBC_USER);
+		jdbcDataSource.setPassword(JDBC_PASSWORD);
+		jdbcDataSource.setURL(JDBC_URL);
+
+		dataSource = jdbcDataSource;
+	}
+
+	@BeforeEach
+	void before() {
+		jdbcTemplate = new JdbcTemplate(dataSource);
+		createTable();
+
+		String sql_head = MessageFormat.format("INSERT INTO {0} ({1}, {2}) VALUES ",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE);
+		StringJoiner sql_sj = new StringJoiner(", ");
+		for (Object[] datum : DATA) {
+			sql_sj.add(MessageFormat.format("( ''{0}'', {1} )", datum[0], datum[1]));
+		}
+
+		jdbcTemplate.execute(sql_head + sql_sj.toString());
+	}
+
+	@AfterEach
+	void after() {
+		dropTable();
+	}
+
+	@Test
+	void testQuery_Single() {
+		String sql = MessageFormat.format("SELECT {2} FROM {0} WHERE {1} LIKE ''{3}''",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE, DATA[0][0]);
+
+		Integer value = jdbcTemplate.query(sql, rs -> {
+			if (rs.next()) {
+				return rs.getInt(1);
+			} else {
+				return null;
+			}
+		});
+
+		assertEquals(DATA[0][1], value);
+	}
+
+	@Test
+	void testQuery_List() {
+		String sql = MessageFormat.format("SELECT {2} FROM {0} WHERE {1} LIKE ''{3}'' OR {1} LIKE ''{4}''",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE, DATA[0][0], DATA[1][0]);
+
+		List<Integer> listValues = jdbcTemplate.query(sql, (rs, rowNum) -> rs.getInt(1));
+
+		assertIterableEquals(Lists.newArrayList(DATA[0][1], DATA[1][1]), listValues);
+	}
+
+	@Test
+	void testQueryForObject() {
+		class Player {
+			String name;
+			int value;
+
+			@Override
+			public boolean equals(Object o) {
+				if (this == o) return true;
+				if (!(o instanceof Player)) return false;
+				Player player = (Player) o;
+				return new EqualsBuilder().append(value, player.value).append(name, player.name).isEquals();
+			}
+
+			@Override
+			public int hashCode() {
+				return new HashCodeBuilder(17, 37).append(name).append(value).toHashCode();
+			}
+		}
+
+		String sql = MessageFormat.format("SELECT {1}, {2} FROM {0} WHERE {1} LIKE ''{3}''",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE, DATA[0][0]);
+
+		Player actualPlayer = jdbcTemplate.queryForObject(sql, (rs, rowNum) -> {
+			Player player0 = new Player();
+			player0.name = rs.getString(COLUMN_NAME);
+			player0.value = rs.getInt(COLUMN_VALUE);
+
+			return player0;
+		});
+
+		Player expectedPlayer = new Player();
+		expectedPlayer.name = (String) DATA[0][0];
+		expectedPlayer.value = (int) DATA[0][1];
+
+		assertEquals(expectedPlayer, actualPlayer);
+	}
+
+	@Test
+	void testQueryForMap() {
+		String sql = MessageFormat.format("SELECT {1}, {2} FROM {0} WHERE {1} LIKE ''{3}''",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE, DATA[0][0]);
+
+		Map<String, Object> actualMap = jdbcTemplate.queryForMap(sql);
+
+		Map<String, Object> expectedMap = ImmutableMap.of(
+				COLUMN_NAME, DATA[0][0],
+				COLUMN_VALUE, DATA[0][1]);
+
+		assertIterableEquals(expectedMap.entrySet(), actualMap.entrySet());
+	}
+
+	@Test
+	void testQueryForList() {
+		String sql = MessageFormat.format("SELECT {1}, {2} FROM {0}",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE);
+
+		List<Map<String, Object>> actualMapList = jdbcTemplate.queryForList(sql);
+
+		List<Map<String, Object>> expectedMapList = Stream.of(DATA)
+				.map(datum -> ImmutableMap.of(COLUMN_NAME, datum[0], COLUMN_VALUE, datum[1]))
+				.collect(Collectors.toList());
+
+		assertIterableEquals(expectedMapList, actualMapList);
+
+	}
+
+	@Test
+	void testUpdate() {
+		String newName = "Player X";
+		String sql = MessageFormat.format("UPDATE {0} SET {1} = ''{3}'' WHERE {1} LIKE ''{2}''",
+				TABLE_NAME, COLUMN_NAME, DATA[0][0], newName);
+
+		int rows = jdbcTemplate.update(sql);
+
+		assertEquals(1, rows);
+
+		sql = MessageFormat.format("SELECT {2} FROM {0} WHERE {1} LIKE ''{3}''",
+				TABLE_NAME, COLUMN_NAME, COLUMN_VALUE, newName);
+
+		Integer value = jdbcTemplate.query(sql, rs -> {
+			if (rs.next()) {
+				return rs.getInt(1);
+			} else {
+				return null;
+			}
+		});
+
+		assertEquals(DATA[0][1], value);
+	}
+
+	private void createTable() {
+		jdbcTemplate.execute("CREATE TABLE " + TABLE_NAME + " (" +
+				COLUMN_ID + " bigint auto_increment," +
+				COLUMN_NAME + " varchar(16)," +
+				COLUMN_VALUE + " integer)");
+	}
+
+	private void dropTable() {
+		jdbcTemplate.execute("DROP TABLE IF EXISTS " + TABLE_NAME);
+	}
+
+	@Nested
+	class JdbcTemplateTest_ExecuteTestCase {
+
+		@BeforeEach
+		void before() {
+			jdbcTemplate = new JdbcTemplate(dataSource);
+			dropTable();
+		}
+
+		@AfterEach
+		void after() {
+			dropTable();
+		}
+
+		@Test
+		void test() throws ClassNotFoundException, IllegalAccessException, InstantiationException, SQLException {
+			createTable();
+
+			//region Check result
+			Class.forName("org.h2.Driver").newInstance();
+			Connection connection = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWORD);
+			ResultSet resultSet = connection.getMetaData().getTables(JDBC_DB_NAME.toUpperCase(), "PUBLIC",
+					TABLE_NAME.toUpperCase(), new String[]{"TABLE"});
+
+			assertTrue(resultSet.next());
+
+			resultSet.close();
+			connection.close();
+			//endregion
+		}
+	}
+}