secureoutputpipe.java

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

/*
 *  $Id: SecureOutputPipe.java,v 1.22 2006/06/02 18:14:50 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.
 *
 *  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
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 *  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.util.Set;
import java.io.IOException;

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

import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.Message;
import net.jxta.id.ID;
import net.jxta.peer.PeerID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.PipeAdvertisement;

/**
 * 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,
    PeerID destPeer, Set 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.
     **/
    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 (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error( failed, failed );
            }
            
            throw failed;
        }
        
        return sent;
    }
    
    /**
     *  {@inheritDoc}
     **/
    protected EndpointAddress mkAddress( ID destPeer, ID pipeID ) {
        
        EndpointAddress addr = new EndpointAddress( "jxtatls", destPeer.getUniqueValue().toString(), "PipeService", pipeID.toString() );
        
        return addr;
    }
}