listenerclient.java

这是一款应用程序与数据库联接

/*
 * =========================================================== JDBMonitor : a
 * flexiable JDBC Monitor for the Java(tm) platform
 * ===========================================================
 * 
 * (C) Copyright 2006-2006, by yang zhongke
 * 
 * Project Info: http://www.cownew.com
 * 
 * This library 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 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * 
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. in the
 * United States and other countries.]
 * 
 * --------------- ListenerClient.java --------------- (C) Copyright 2006-2006,
 * by yang zhongke
 * 
 * Original Author: yang zhongke;
 * 
 * Changes -------
 * 
 */
package com.cownew.JDBMonitor.listenerImpl.sckListenerClient;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.Socket;

import com.cownew.JDBMonitor.common.CommonUtils;
import com.cownew.JDBMonitor.common.InstanceUtils;
import com.cownew.JDBMonitor.common.SQLInfo;

/**
 * this is the client that listens the SocketDBListener<br>  
 * @author yang zhongke
 */
public class ListenerClient
{
	private int port;

	private String hostname;

	private IDBSocketClientListener listener;

	private Socket socket;

	private boolean isClosed;

	/**
	 * constuct a Client Listener,which will connect to "hostName" at port "port"<br>
	 * when a SQL statement received,the method "receive" 
	 * of IDBSocketClientListener will be invoked<br>
	 * @param hostName
	 * @param port
	 * @param listener
	 */
	public ListenerClient(String hostName, int port,
			IDBSocketClientListener listener)
	{
		super();
		this.hostname = hostName;
		this.port = port;
		this.listener = listener;
		isClosed = false;
	}

	/**
	 * connect to the socket server
	 * @throws IOException
	 */
	public void connect() throws IOException
	{
		socket = new Socket(hostname, port);
		Thread thread = new Thread(new SocketListener());
		thread.start();
	}

	class SocketListener implements Runnable
	{

		public SocketListener()
		{
			super();
		}

		public void run()
		{
			try
			{

				while (true)
				{
					synchronized (socket)
					{
						if (isClosed)
						{
							return;
						}
						ObjectInputStream ois = new ObjectInputStream(socket
								.getInputStream());
						listener.receive((SQLInfo) ois.readObject());
					}
				}
			} catch (IOException e)
			{
				throw CommonUtils.toRuntimeException(e);
			} catch (ClassNotFoundException e)
			{
				throw CommonUtils.toRuntimeException(e);
			}
		}
	}

	public void close() throws IOException
	{
		synchronized (socket)
		{
			isClosed = true;
		}
		InstanceUtils.closeSocket(socket);
	}

}