messagequeue.java

Java Communicating Agents是一个用于开发网络反应式信息agent的框架

/*
 * $Source: /home/data/cvsroot/src/jacomma/platform/engine/MessageQueue.java,v $
 * $Revision: 1.8 $
 * $Date: 2000/10/28 20:09:08 $
 *
 * This file is part of the jacomma framework
 * Copyright (c) 2000 	Dimitrios Vyzovitis
 *			mailto:[e-mail]
 *			
 *
 *			
 *			
 *			
 *
 *	This library 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.
 *
 *	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 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, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, 
 *	Boston, MA  02111-1307  USA
 */

package jacomma.platform.engine;

import jacomma.platform.core.MessagePattern;
import jacomma.icm.type.Message;
import jacomma.util.Queue;
import jacomma.util.Visitor;
import jacomma.util.TypeIterator;

import java.util.List;
import java.util.ArrayList;

/**
 * TBA
 **/
class MessageQueue implements MessageBuffer {
	
	Queue que_ = new Queue();

	MessageQueue( ) {}

	public void signal() { que_.signal(); }

	public void put( Message msg ) {
		que_.put( new Entry( msg, MessagePattern.makeKeys( msg ) ) );
	}
	
	public Message get() throws InterruptedException {
		return ((Entry)que_.get()).getMessage();
	}
	
	public Message try_get() {
		Entry entry = (Entry)que_.try_get();
		return (entry == null) ? null : entry.getMessage();
	}
	
	public Object try_accept( Visitor v ) {
		return que_.try_accept( v );
	}

	public Object accept( Visitor v ) throws InterruptedException {
		return que_.accept( v );
	}
	
	public class Entry {
		
		Message msg_;
		List ptrn_;
		
		Entry( Message msg, List ptrn ) {
			msg_ = msg;
			ptrn_ = ptrn;
		}
		
		public String toString() { return msg_.toString(); }

		public Message getMessage(){ return msg_; }
		public List patterns() { return ptrn_; }

	}

}