secureoutputpipe.java

JXTA&#8482 is a set of open, generalized peer-to-peer (P2P) protocols that allow any networked devi

/*
 * Copyright (c) 2001-2007 Sun Microsystems, Inc.  All rights reserved.
 *  
 *  The Sun Project JXTA(TM) Software License
 *  
 *  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 Sun Microsystems, Inc. for JXTA(TM) technology." 
 *     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 
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 *  
 *  JXTA is a registered trademark of Sun Microsystems, Inc. in the United 
 *  States and other countries.
 *  
 *  Please see the license information page at :
 *  <http://www.jxta.org/project/www/license.html> for instructions on use of 
 *  the license in source files.
 *  
 *  ====================================================================
 *  
 *  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 net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.Message;
import net.jxta.id.ID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.PipeAdvertisement;
import java.util.logging.Level;
import net.jxta.logging.Logging;
import java.util.logging.Logger;

import java.io.IOException;
import java.util.Set;

/**
 * This class implements the Secure non blocking Output Pipe
 */
class SecureOutputPipe extends NonBlockingOutputPipe {

    private static final Logger LOG = Logger.getLogger(SecureOutputPipe.class.getName());

    public SecureOutputPipe(PeerGroup group, PipeResolver resolver, PipeAdvertisement pipeAdv, ID destPeer, Set<? extends ID> peers) throws IOException {
        super(group, resolver, pipeAdv, destPeer, peers);
    }

    /**
     * {@inheritDoc}
     * 
     * <p/>
     * We can't fail to send a message. Secure pipes are expected to be
     * reliable and ordered.
     */
    @Override
    public synchronized boolean send(Message msg) throws IOException {

        boolean sent = false;
        int attempts = 1;

        while (!sent && !isClosed()) {
            try {
                sent = super.send(msg);

                if (!sent) {
                    wait(10 + (1 << Math.min(attempts, 14)));
                    attempts++;
                }
            } catch (InterruptedException woken) {
                Thread.interrupted();
            }
        }

        if (!sent && isClosed()) {
            IOException failed = new IOException("Could not enqueue " + msg + " for sending. Pipe is closed.");
            if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
                LOG.log(Level.WARNING, failed.getMessage(), failed);
            }
            throw failed;
        }
        return sent;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected EndpointAddress mkAddress(ID destPeer, ID pipeID) {
       return new EndpointAddress("jxtatls", destPeer.getUniqueValue().toString(), "PipeService", pipeID.toString());
    }
}