unicastdialogmanager.java

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/*
*  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 discalimer 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 getdiaProject 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 THE APACHE SOFTWARE FOUNDATION 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.
*
*  $Id: UnicastDialogManager.java,v 1.9 2007/06/10 21:15:11 nano Exp $
*/

package net.jxta.myjxta.dialog;

import net.jxta.myjxta.util.PipeUtil;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.PipeAdvertisement;
import net.jxta.util.JxtaBiDiPipe;
import net.jxta.util.JxtaServerPipe;

import java.io.IOException;
import java.net.SocketException;
import java.util.List;

/**
 * @author james todd [gonzo at jxta dot org]
 * @version $Id: UnicastDialogManager.java,v 1.9 2007/06/10 21:15:11 nano Exp $
 */

class UnicastDialogManager
        extends AbstractDialogManager {

    //    private static final int TIMEOUT = 120 * 1000;
    private static final int TIMEOUT = 0;

    /**
     * The JxtaServerPiper on which to receive messages
     */
    private JxtaServerPipe serverPipe = null;
    private ServerThread serverThread = null;

    public UnicastDialogManager(String name, String type) {
        super(name, type);
    }

    /**
     * Initializes this DialogManager for the indicated PeerGroup
     * Here the pipe is opened
     *
     * @param pg the PeerGroup for which to initialize this DialogManager
     */
    public void initialize(PeerGroup pg) {
        // create a new serverPipe instance
        try {
            this.serverPipe = new JxtaServerPipe(pg, getPipeAdv(pg));
        } catch (IOException ioe) {
            ioe.printStackTrace(System.out);
        }

        // Create a new thread that accepts connections
        // coming in on the newly created serverPipe
        if (this.serverPipe != null) {
            try {
                this.serverPipe.setPipeTimeout(TIMEOUT);
            } catch (SocketException se) {
                se.printStackTrace(System.out);
            }

            this.serverThread = new ServerThread(pg, this.serverPipe,
                    getClass().getName() + ":JxtaServerPipe");
            serverThread.start();
        }
    }

    /**
     * { @inheritDoc }
     */
    public void close() {
        if (serverThread != null) {
            serverThread.stopServer();
            serverThread.interrupt();
        }


        if (this.serverPipe != null) {
            try {
                this.serverPipe.close();
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
        }
    }

    /**
     * Get the PipeAdvertisement for the indicated PeerGroup
     *
     * @param pg the PeerGroup for which to create the advertisment
     */
    public PipeAdvertisement getPipeAdv(PeerGroup pg) {
        return PipeUtil.getAdv(pg, getDialogName(), getType(), null);
    }

    /**
     * The thread that waits on a new connection request is received
     * on the serverPipe instance
     */
    private class ServerThread
            extends Thread {
        /**
         * The PeerGroup in which this listener operates
         */
        private PeerGroup pg = null;
        private JxtaServerPipe serverPipe = null;
        private boolean stopped = false;

        /**
         * Create a new ServerThread object
         *
         * @param pg   the PeerGroup in which this listener operates
         * @param name the name of the thread
         */
        protected ServerThread(PeerGroup pg, JxtaServerPipe serverPipe,
                               String name) {
            super(name);

            this.pg = pg;
            this.serverPipe = serverPipe;
            setDaemon(true);
        }

        public void stopServer() {
            stopped = true;
            if (this.serverPipe != null)
                if (!this.serverPipe.isClosed())
                    try {
                        this.serverPipe.close();

                    } catch (IOException e) {
                        e.printStackTrace();
                    }

        }

        /**
         * Wait until a new connection request is received
         * on the serverPipe instance and if so pass it on
         * to the registered DialogPipeListeners
         */
        public void run() {
            JxtaBiDiPipe pipe = null;

            while (!stopped) {
                // wait until a connection request is received
                try {
                    pipe = this.serverPipe.accept();
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                }

                // if a connection request is received,
                // pass it on to the registered DialogPipeListeners
                if (pipe != null) {
                    List<DialogPipeListener> list = getListeners(this.pg);
                    if (list != null) {
                        for (DialogPipeListener aList : list) {
                            (aList).receive(this.pg, pipe);
                        }
                    }
                }
            }
            //System.out.println("shutdown");
        }
    }
}