beepnonblockingmessenger.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

/*
 * 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.
 *
 * $Id: BeepNonBlockingMessenger.java,v 1.4 2001/11/07 23:20:51 jice Exp $
 */

package net.jxta.impl.endpoint.beep;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import java.io.IOException;

import org.apache.log4j.Category; import org.apache.log4j.Priority;

import org.beepcore.beep.core.ByteDataStream;
import org.beepcore.beep.core.Channel;
import org.beepcore.beep.core.DataStream;
import org.beepcore.beep.lib.Reply;

import org.beepcore.beep.core.BEEPError;

import net.jxta.document.MimeMediaType;
import net.jxta.endpoint.EndpointMessenger;
import net.jxta.endpoint.Message;

import net.jxta.impl.endpoint.MessageWireFormatFactory;

/**
 * An EndpointMessenger allows to send Messages onto
 * its associated TransportProtocol.
 *
 * @since       JXTA 1.0
 */

public class BeepNonBlockingMessenger implements EndpointMessenger {
    /**
     *  Our Log4J Category
     **/
    private static final Category LOG = Category.getInstance(BeepNonBlockingMessenger.class.getName());
    
    /**
     *  The session associated with this messenger
     **/
    private BeepSession session;
    
    /**
     *  The channel we are using for this messenger
     **/
    private Channel channel;
    
    /**
     * Create a new messagener for the specified session.
     * @param session The session for which the messenger is being created.
     * @throws IOException Thrown when the messenger cannot be created.
     */
    public BeepNonBlockingMessenger( BeepSession session ) throws IOException {
        
        // Not much has to be done
        
        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("Constructor");
        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("   dest addr = " + session.getDestEndpoint() );
        
        this.session = session;
        
        channel = session.getNewChannel();
    }
    
    /**
     * Send a TransportMessage onto that link.
     *
     * @param message TransportMessage to be sent.
     * @throws IOException Thrown when the message cannot be sent.
     */
    public void sendMessage(Message message) throws IOException {
        
        /* FIXME    20010723    [e-mail]
         *
         *  At this point, the session and/or channel may have been closed due
         *  to idle timeouts. We don't currently reopen the session or get
         *  a new channel. this makes this messesnger dead in the water.
         */
        
        if( !session.isActive() ) {
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "Session was closed with " + session.getDestEndpoint() );
            throw new IOException( "Session was closed with " + session.getDestEndpoint() );
        }
        
        try {
            // Set the message with the appropriate src and dest address
            message.setDestinationAddress( session.getDestEndpoint() );
            message.setSourceAddress( session.getSrcEndpoint() );
            
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("sendMessage");
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("   from = " + session.getSrcEndpoint() );
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug("     to = " + session.getDestEndpoint() );
            
            // XXX 20010725 [e-mail] This buffering is due to not 
            // knowing the size of the message
            ByteArrayOutputStream messy = new ByteArrayOutputStream();
            MessageWireFormatFactory.newMessageWireFormat( 
            new MimeMediaType( "application/x-jxta-msg" ) )
            .writeMessage(messy, message);
            
            Reply reply = new Reply();
            
            DataStream msg = new ByteDataStream( messy.toByteArray() );
            channel.sendMSG( msg, reply);
            
            if (LOG.isEnabledFor(Priority.INFO)) LOG.info( "message sent, waiting for reply.");
            
            // Get the reply to the request
            DataStream ds = reply.getNextReply().getDataStream();
            InputStream is = ds.getInputStream();
            ByteArrayOutputStream rpy = new ByteArrayOutputStream();
            
            // Read the data in the reply
            while (ds.isComplete() == false || is.available() > 0) {
                int res = is.read();
                if( -1 != res )
                    rpy.write( ((byte) res) );
            }
            
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "message sent, got reply.");
            
            if( !rpy.toString().equals( "OK" ) ) {
                if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "Bad reply" );
            }
        } catch (BEEPError e) {
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "Error sending request (" + e.getCode() +
            ": " + e.getMessage() + ")");
            return;
        } catch (Exception e) {
            if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "Error sending request (" +
            e.getMessage() + ")");
            return;
        }
        
        session.updateLastUsed( );
        
        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "message sent OK");
    }
    
    /**
     * Close this Messenger
     */
    public void close() {
        
        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "close for " + session.getDestEndpoint() );
        session.releaseChannel( channel );
    }
    
}