keepalivethread.java

java写的qq代码实现qq的部分功能

/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma <[e-mail]>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.tsinghua.lumaqq.qq;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.tsinghua.lumaqq.qq.net.IPort;

/**
 * 这个线程定时发送Keep Alive包
 *
 * @author 马若劼
 */
public class KeepAliveThread extends Thread {
    // Log对象
    protected static Log log = LogFactory.getLog(KeepAliveThread.class);
    // Port类
    private IPort port;
    // QQ客户端类
    private QQClient client;
    // 停止标志
    private volatile boolean stop;    
    
    /**
     * @param sender 发送类
     * @param lock 操作锁
     */
    public KeepAliveThread(QQClient client) {
        this.client = client;
        this.stop = false;
        this.setName("Keep Alive");
    }
    
	/**
	 * @param stop The stop to set.
	 */
	public synchronized void setStop(boolean stop) {
		this.stop = stop;
		this.notify();
	}
	
	/* (non-Javadoc)
	 * @see java.lang.Runnable#run()
	 */
	public void run() {
		while(!stop) {
			try {
			    synchronized(this) {
					wait(QQ.QQ_KEEP_ALIVE_INTERVAL);			        
			    }
			} catch (InterruptedException e) {
			    // 没有什么要做的
			}
			// 检查停止标志
			if(stop) break;
			// 检查现在是否已经登陆，已经登陆则发送keep alive
			client.keepAlive();
		}
		log.debug("Keep Alive线程正常退出");
	}
}