remotegcbuffer.java

来自「主要是对串口驱动的的一些控制源码！！！ 在下载javacomm20-win32」· Java 代码 · 共 113 行

/**
 * $Log: RemoteGCBuffer.java,v $
 * Revision 1.2  2003/02/01 17:39:15  willaxt
 * now externalizable
 *
 * Revision 1.1  2003/01/16 13:12:40  mwulff
 * initial version
 *
 * Revision 1.4  2002/12/20 18:52:25  mwulff
 * no message
 *
 * Revision 1.3  2002/12/15 16:55:07  mwulff
 * adjusted to reorganisation of the client logging system
 *
 * Revision 1.2  2002/12/13 20:08:34  mwulff
 * no message
 *
 * Revision 1.1  2002/12/05 21:31:46  mwulff
 * initial version
 *
 */
package de.fhm.jkf.comm.cl;

import java.io.Serializable;
import java.util.Vector;

import de.fhm.jkf.comm.clsv.RemoteObjectID;

/**
 * @author	marten wulff
 * 
 * * <br><br><center><table border="1" width="80%"><hr>
 * <strong><a href="http://jkf.sourceforge.net">The JKF Project</a></strong>
 * <p>
 * Copyright (C) 2002 by Marten Wulff
 * <p>
 * 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.
 * <p>
 * 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.
 * <p>
 * You should have received a copy of the <a href="http://www.gnu.org/copyleft/lesser.html">
 * GNU Lesser General Public License</a> along with this library; if not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA  02111-1307  USA
 * <hr></table></center>
 * 
 * This class is not externalizable, because it would need a public default
 * constructor. This would really break the singleton.
 * 
 * @stereotype <<singleton>>
 */
class RemoteGCBuffer implements Serializable {

	private static RemoteGCBuffer instance = null;
	private static Object semaphore = new Object();
		
	private Vector gcBuffer = null;


	/**
	 * Constructor for RemoteGCBuffer.
	 */
	private RemoteGCBuffer() {
		super();
		
		gcBuffer = new Vector();
	}
	
	static RemoteGCBuffer instance() {
		if(instance == null) {
			synchronized(semaphore) {
				if(instance == null) {
					instance = new RemoteGCBuffer();
				}
			}
		}
		
		return instance;
	}
	
	/**
	 * Adds a RemoteObjectID to the buffer.
	 * 
	 * @param id  a RemoteObjectID
	 */
	void addGCMessage(RemoteObjectID id) {
		gcBuffer.addElement(id);
	}
	
	/**
	 * Method for getting all currently stored RemoteObjectIDs 
	 * from objects that must be garbage collected remotly.
	 * 
	 * @return Vector  a Vector containing RemoteObjectIDs
	 */
	Vector getGCMessages() {
		// clone the gcBuffer
		Vector result = (Vector) gcBuffer.clone();

		// clear the logBuffer
		gcBuffer.clear();

		// return the clone
		return result;
	}
}