Classic branch.

L2J_Mobius_Classic/java/com/l2jmobius/commons/database/DatabaseFactory.java

@@ -0,0 +1,135 @@
+/*
+ * This file is part of the L2J Mobius project.
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.l2jmobius.commons.database;
+
+import java.beans.PropertyVetoException;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.logging.Logger;
+
+import com.l2jmobius.Config;
+import com.mchange.v2.c3p0.ComboPooledDataSource;
+
+/**
+ * Database Factory implementation.
+ * @author Zoey76, Mobius
+ */
+public class DatabaseFactory
+{
+	private static final Logger _log = Logger.getLogger(DatabaseFactory.class.getName());
+	
+	private final ComboPooledDataSource _dataSource;
+	
+	public DatabaseFactory()
+	{
+		if (Config.DATABASE_MAX_CONNECTIONS < 2)
+		{
+			Config.DATABASE_MAX_CONNECTIONS = 2;
+			_log.warning("A minimum of 2 connections are required.");
+		}
+		
+		_dataSource = new ComboPooledDataSource();
+		_dataSource.setAutoCommitOnClose(true);
+		
+		_dataSource.setInitialPoolSize(10);
+		_dataSource.setMinPoolSize(10);
+		_dataSource.setMaxPoolSize(Math.max(10, Config.DATABASE_MAX_CONNECTIONS));
+		
+		_dataSource.setAcquireRetryAttempts(0); // try to obtain connections indefinitely (0 = never quit)
+		_dataSource.setAcquireRetryDelay(500); // 500 milliseconds wait before try to acquire connection again
+		_dataSource.setCheckoutTimeout(0); // 0 = wait indefinitely for new connection if pool is exhausted
+		_dataSource.setAcquireIncrement(5); // if pool is exhausted, get 5 more connections at a time cause there is
+		// a "long" delay on acquire connection so taking more than one connection at once will make connection pooling more effective.
+		
+		// this "connection_test_table" is automatically created if not already there
+		_dataSource.setAutomaticTestTable("connection_test_table");
+		_dataSource.setTestConnectionOnCheckin(false);
+		
+		// testing OnCheckin used with IdleConnectionTestPeriod is faster than testing on checkout
+		
+		_dataSource.setIdleConnectionTestPeriod(3600); // test idle connection every 60 sec
+		_dataSource.setMaxIdleTime(Config.DATABASE_MAX_IDLE_TIME); // 0 = idle connections never expire
+		// *THANKS* to connection testing configured above but I prefer to disconnect all connections not used for more than 1 hour
+		
+		// enables statement caching, there is a "semi-bug" in c3p0 0.9.0 but in 0.9.0.2 and later it's fixed
+		_dataSource.setMaxStatementsPerConnection(100);
+		
+		_dataSource.setBreakAfterAcquireFailure(false); // never fail if any way possible setting this to true will make c3p0 "crash"
+		// and refuse to work till restart thus making acquire errors "FATAL" ... we don't want that it should be possible to recover
+		
+		try
+		{
+			_dataSource.setDriverClass(Config.DATABASE_DRIVER);
+		}
+		catch (PropertyVetoException e)
+		{
+			e.printStackTrace();
+		}
+		_dataSource.setJdbcUrl(Config.DATABASE_URL);
+		_dataSource.setUser(Config.DATABASE_LOGIN);
+		_dataSource.setPassword(Config.DATABASE_PASSWORD);
+		
+		/* Test the connection */
+		try
+		{
+			_dataSource.getConnection().close();
+		}
+		catch (SQLException e)
+		{
+			e.printStackTrace();
+		}
+	}
+	
+	public Connection getConnection()
+	{
+		Connection con = null;
+		while (con == null)
+		{
+			try
+			{
+				con = _dataSource.getConnection();
+			}
+			catch (SQLException e)
+			{
+				_log.warning(getClass().getSimpleName() + ": Unable to get a connection: " + e.getMessage());
+			}
+		}
+		return con;
+	}
+	
+	public void close()
+	{
+		try
+		{
+			_dataSource.close();
+		}
+		catch (Exception e)
+		{
+			_log.info(e.getMessage());
+		}
+	}
+	
+	public static DatabaseFactory getInstance()
+	{
+		return SingletonHolder.INSTANCE;
+	}
+	
+	private static class SingletonHolder
+	{
+		protected static final DatabaseFactory INSTANCE = new DatabaseFactory();
+	}
+}