xdev.db.jdbc.JDBCDataSource Maven / Gradle / Ivy

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package xdev.db.jdbc;

/*-
 * #%L
 * XDEV Application Framework
 * %%
 * Copyright (C) 2003 - 2020 XDEV Software
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */


import java.sql.Connection;

import xdev.db.AbstractDBDataSource;
import xdev.db.ConnectionInformation;
import xdev.db.ConnectionPool;
import xdev.db.DBException;

import com.xdev.jadoth.sqlengine.dbms.DbmsAdaptor;
import com.xdev.jadoth.sqlengine.exceptions.SQLEngineCouldNotConnectToDBException;
import com.xdev.jadoth.sqlengine.interfaces.ConnectionProvider;
import com.xdev.jadoth.sqlengine.internal.DatabaseGateway;


public abstract class JDBCDataSource, A extends DbmsAdaptor>
		extends AbstractDBDataSource
{
	private final A				adaptor;
	private ConnectionProvider	connectionProvider;
	private DatabaseGateway	gateway;
	

	public JDBCDataSource(A adaptor)
	{
		this.adaptor = adaptor;
	}
	

	@Override
	public abstract JDBCConnection openConnectionImpl() throws DBException;
	

	public A getDbmsAdaptor()
	{
		return this.adaptor;
	}
	

	@Override
	public void closeAllOpenConnections() throws DBException
	{
		if(this.connectionProvider != null)
		{
			this.connectionProvider.close();
			this.connectionProvider = null;
		}
	}
	

	@Override
	public void clearCaches()
	{
		this.connectionProvider = null;
		this.gateway = null;
	}
	

	public DatabaseGateway getGateway()
	{
		if(this.gateway == null)
		{
			this.gateway = this.createGateway();
		}
		
		return this.gateway;
	}
	

	protected DatabaseGateway createGateway()
	{
		return new DatabaseGateway(this.getConnectionProvider());
	}
	

	public ConnectionProvider getConnectionProvider()
	{
		if(this.connectionProvider == null)
		{
			this.connectionProvider = this.createConnectionProvider();
		}
		
		return this.connectionProvider;
	}
	

	protected ConnectionProvider createConnectionProvider()
	{
		return new ConnectionPool(this.getConnectionPoolSize(),this.keepConnectionsAlive(),this.adaptor,
				this.getConnectionInformation(), this.connConfig == null ? -1 : this.connConfig.getMaxStatementsPerConnection());
	}
	

	protected abstract ConnectionInformation getConnectionInformation();
	

	final Connection connectImpl() throws DBException
	{
		try
		{
			return this.getConnectionProvider().getConnection();
		}
		catch(final SQLEngineCouldNotConnectToDBException e)
		{
			Throwable cause = e.getCause();
			if(cause == null)
			{
				cause = e;
			}
			throw new DBException(this,cause.getMessage(),cause);
		} 
	}
}