wireinputpipe.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * $Id: WireInputPipe.java,v 1.2 2002/03/04 21:42:59 echtcherbina Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS  OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 */
package net.jxta.impl.pipe;
import java.io.*;

import net.jxta.endpoint.*;
import net.jxta.impl.endpoint.*;
import net.jxta.peergroup.*;
import net.jxta.impl.peergroup.*;
import net.jxta.pipe.*;
import org.apache.log4j.Category; import org.apache.log4j.Priority;


/**
 * This class implements the InputPipe of WIRE
 */


public class WireInputPipe implements InputPipe {
    
    private static final Category LOG = Category.getInstance(WireInputPipe.class.getName());
    
    private EndpointReceiveQueue queue = null;
    private PipeMsgListener listener = null;
    private boolean  closed = false;
    private WirePipe wire = null;
    
    public WireInputPipe(WirePipe wire) {
        
        this.wire = wire;
        
        // Initialize the user queue
        this.queue = new EndpointReceiveQueue();
        wire.registerQueue(queue);
    }
    
    public WireInputPipe(WirePipe wire, PipeMsgListener listener) {
        
        this.wire = wire;
        // register the listener
        this.listener = listener;
        wire.registerPipeMsgListener(listener);
    }
    
    /**
     * wait for a message
     *
     * @return Message  message received
     */
    
    public Message waitForMessage() throws InterruptedException {
        
        if(queue!=null)
            return queue.waitForMessage();
        else
            return null;
    }
    
    /**
     * Poll for a message from the pipe
     *
     * @return Message message received
     */
    public Message poll(int timeout) throws InterruptedException {
        
        if(queue!=null)
            return queue.poll(timeout);
        else
            return null;
    }
    
    /**
     * close the the pipe
     *
     */
    public synchronized void close() {
        
        if(queue!=null){
            wire.forgetQueue(queue);
            // Close the queue
            queue.close();
        } else if (listener != null){
            wire.forgetPipeMsgListener(listener);
        }
        closed = true;
    }
    
    protected void finalize() throws Throwable {
        if (!closed) {
            close();
        }
    }
}