basicrunqueue.java

来自「mysql集群」· Java 代码 · 共 66 行

/*
 * 	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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package com.meidusa.amoeba.util;

/**
 * A very basic implementation of RunQueue for general purpose use.
 */
public class BasicRunQueue extends LoopingThread implements RunQueue {
	/**
	 * Construct a BasicRunQueue with a default Queue implementation.
	 */
	public BasicRunQueue() {
		super("RunQueue");
		_queue = new Queue<Runnable>();
	}

	public BasicRunQueue(String queueName) {
		super(queueName);
		_queue = new Queue<Runnable>();
	}
	// documentation inherited from interface
	public void postRunnable(Runnable r) {
		_queue.append(r);
	}

	// documentation inherited from interface
	public boolean isDispatchThread() {
		return Thread.currentThread() == this;
	}

	// documentation inherited
	protected void iterate() {
		Runnable r = _queue.get();
		try {
			r.run();

		} catch (Throwable t) {
			// TODO log Runnable posted to RunQueue barfed
		}
	}

	// documentation inherited
	protected void kick() {
		postRunnable(new Runnable() {
			public void run() {
				// nothing
			}
		});
	}

	public int size(){
		return _queue.size();
	}
	/** The queue of things to run. */
	protected Queue<Runnable> _queue;
}