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/*
  GRANITE DATA SERVICES
  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.

  This file is part of Granite Data Services.

  Granite Data Services is free software; you can redistribute it and/or modify
  it under the terms of the GNU Library General Public License as published by
  the Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  Granite Data Services 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 Library General Public License
  for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; if not, see .
*/

package org.granite.gravity;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * @author Franck WOLFF
 */
public abstract class AsyncChannelRunner implements Runnable {

	protected final Channel channel;
	private final AtomicBoolean queued = new AtomicBoolean(false);
	
	public AsyncChannelRunner(Channel channel) {
		this.channel = channel;
	}
	
	public final boolean queue(Gravity gravity) {
		if (queued.getAndSet(true))
			return false;
		gravity.execute(this);
		return true;
	}
	
	public final void reset() {
		queued.set(false);
	}
	
	protected abstract void doRun();
	
	public final void run() {
		try {
			doRun();
		}
		finally {
			queued.set(false);
		}
	}

	@Override
	public boolean equals(Object obj) {
		return getClass().isInstance(obj) && channel.equals(((AsyncChannelRunner)obj).channel);
	}

	@Override
	public int hashCode() {
		return channel.hashCode();
	}
}