tlsmessenger.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/************************************************************************
 *
 * $Id: TlsMessenger.java,v 1.20 2004/05/25 00:52:54 bondolo 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.
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 * 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
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * 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.endpoint.tls;


import java.io.*;
import java.util.*;

import org.apache.log4j.Logger;
import org.apache.log4j.Level;

import net.jxta.endpoint.*;
import net.jxta.document.*;
import net.jxta.peergroup.*;
import net.jxta.discovery.*;
import net.jxta.id.*;
import net.jxta.protocol.*;

import net.jxta.resolver.*;
import net.jxta.exception.*;

import net.jxta.impl.util.*;
import net.jxta.impl.protocol.*;
import net.jxta.impl.discovery.*;
import net.jxta.impl.endpoint.*;
import net.jxta.impl.endpoint.tls.TlsConn.HandshakeState;


/**
 * This class implements sending message onto a TLS connection.
 **/

public class TlsMessenger extends BlockingMessenger {
    
    private static final Logger LOG = Logger.getLogger(TlsMessenger.class.getName());
    
    private TlsTransport transport = null;
    private TlsConn conn = null;
    
    /**
     *  The source address of messages sent on this messenger.
     **/
    private EndpointAddress srcAddress = null;
    
    private MessageElement srcAddressElement = null;
    
    TlsMessenger(EndpointAddress destAddress,
            TlsConn conn,
            TlsTransport tp) {
        
        // No need for self destruction.
        super(tp.getPeerGroup().getPeerGroupID(), destAddress, false);
        
        if (conn == null) {
            if (LOG.isEnabledFor(Level.DEBUG)) {
                LOG.debug("null TLS connection!");
            }
            throw new IllegalArgumentException("null TLS connection!");
        }
        
        this.conn = conn;
        this.transport = tp;
        
        this.srcAddress = transport.getPublicAddress(); // already a clone
        
        srcAddressElement = new StringMessageElement(EndpointServiceImpl.MESSAGE_SOURCE_NAME, srcAddress.toString(), (MessageElement) null);
    }
    
    /*
     * The cost of just having a finalize routine is high. The finalizer is
     * a bottleneck and can delay garbage collection all the way to heap
     * exhaustion. Leave this comment as a reminder to future maintainers.
     * Below is the reason why finalize is not needed here.
     *
     * These messengers never go to the application layer. The endpoint code
     * always invokes close when needed.

     protected void finalize() {
     }

     */
    
    /**
     * {@inheritDoc}
     **/
    public synchronized void closeImpl() {
        super.close();
        conn = null;
    }

    /**
     * {@inheritDoc}
     **/
    public boolean isIdleImpl() {
        // No need for self destruction.
        return false;
    }
    
    /**
     * {@inheritDoc}
     *
     * <p/>The peer that is the destination is the logical address
     **/
    public EndpointAddress getLogicalDestinationImpl() {
        return new EndpointAddress("jxta", dstAddress.getProtocolAddress(), null, null);
    }
    
    /**
     * {@inheritDoc}
     **/
    public synchronized boolean sendMessageBImpl(Message message, String service, String serviceParam) throws IOException {
        
        if (LOG.isEnabledFor(Level.DEBUG)) {
            LOG.debug("sendMessage starts");
        }
        
        // check if the connection has died.
        if (HandshakeState.CONNECTIONDEAD == conn.getHandshakeState()) {

            // FIXME - [e-mail] 20040413: This will do but it causes the below exception to be shown as the cause of the
            // failure, which is not true: nobody realy closed the messenger before it failed. It failed first.  Also, it used to
            // shutdown this messenger, now it does not. What does is the call to closeImpl() that follows our IOException...(and
            // that's how it should be). Transports should get a deeper retrofit eventually.

            close();
        }
        
        if (isClosed()) {
            IOException failure = new IOException("Messenger is closed, it cannot be used to send messages.");
            
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn(failure, failure);
            }
            
            throw failure;
        }
        
        // Set the message with the appropriate src and dest address
        message.replaceMessageElement(EndpointServiceImpl.MESSAGE_SOURCE_NS, srcAddressElement);
        
        MessageElement dstAddressElement = new StringMessageElement(EndpointServiceImpl.MESSAGE_DESTINATION_NAME,
                getDestAddressToUse(service, serviceParam).toString(), (MessageElement) null);
        
        message.replaceMessageElement(EndpointServiceImpl.MESSAGE_DESTINATION_NS, dstAddressElement);
        
        // Give the message to the TLS connection
        try {
            conn.sendMessage(message);
        } catch (IOException caught) {
            close();
            if (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error("Message send to '" + dstAddress + "' failed for " + message, caught);
            }
            throw caught;
        }
        
        if (LOG.isEnabledFor(Level.DEBUG)) {
            LOG.debug("Message send to '" + dstAddress + "' succeeded for " + message);
        }
        
        return true;
    }
    
}