httpmessagesender.java

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

/*
 *
 * $Id: HttpMessageSender.java,v 1.20 2006/03/06 20:43:32 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
 * 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.
 */

package net.jxta.impl.endpoint.servlethttp;

import java.util.Iterator;
import java.util.Map;
import java.util.WeakHashMap;

import java.net.SocketTimeoutException;
import java.net.ConnectException;

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

import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageSender;
import net.jxta.endpoint.Messenger;

import net.jxta.exception.PeerGroupException;


/**
 * Simple Client MessageSender
 */
class HttpMessageSender implements MessageSender {

    /**
     *    Log4j Logger
     **/
    private final static transient Logger LOG = Logger.getLogger(HttpMessageSender.class.getName());

    /**
     * The ServletHttpTransport that created this object
     **/
    private final ServletHttpTransport servletHttpTransport;    

    /**
     * The public address for this message sender
     **/
    private final EndpointAddress publicAddress;

    /**
     *  Map of Messengers to servers.
     **/
    private final Map messengers = new WeakHashMap();

    /**
     * constructor
     **/
    public HttpMessageSender(ServletHttpTransport servletHttpTransport,
            EndpointAddress publicAddress ) throws PeerGroupException {

        this.servletHttpTransport = servletHttpTransport;
        this.publicAddress = publicAddress;
        
        if (LOG.isEnabledFor(Level.INFO)) {
            StringBuffer configInfo = new StringBuffer("Configuring HTTP Client Message Transport : " + servletHttpTransport.assignedID );
            
            configInfo.append( "\n\tPublic Address = " + publicAddress );

            LOG.info(configInfo);
        }
        
    }

    /**
     * {@inheritDoc}
     **/
    public EndpointAddress getPublicAddress() {
        return (EndpointAddress) publicAddress.clone();
    }

    /**
     * {@inheritDoc}
     **/
    public boolean isConnectionOriented() {
        return true;
    }

    /**
     * {@inheritDoc}
     **/
    public boolean allowsRouting() {
        return true;
    }

    /**
     * {@inheritDoc}
     **/
    public Object transportControl(Object operation, Object Value) {
        return null;
    }

    /**
     * shut down all client connections.
     **/
    public synchronized void start() throws PeerGroupException {
        if (servletHttpTransport.getEndpointService().addMessageTransport(this) == null) {
            throw new PeerGroupException("Transport registration refused");
        }
        
        if (LOG.isEnabledFor(Level.INFO)) {
            LOG.info( "HTTP Client Transport started.");
        }
    }

    /**
     * shut down all client connections.
     **/
    public synchronized void stop() {
        synchronized( messengers ) {
            Iterator eachMessenger = messengers.keySet().iterator();
            
            while( eachMessenger.hasNext() ) {
                HttpClientMessenger aMessenger = (HttpClientMessenger) eachMessenger.next();
                eachMessenger.remove();
                
                aMessenger.doShutdown();
            }
        }
        
        if (LOG.isEnabledFor(Level.INFO)) {
            LOG.info( "HTTP Client Transport stopped.");
        }
    }

    /**
     * {@inheritDoc}
     **/
    public Messenger getMessenger(EndpointAddress destAddr, Object hintIgnored) {
        if (LOG.isEnabledFor(Level.DEBUG)) {
            LOG.debug("getMessenger for : " + destAddr);
        }

        if (!getProtocolName().equals(destAddr.getProtocolName())) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn("Cannot make messenger for protocol :" + destAddr.getProtocolName());
            }

            return null;
        }

        try {
            // Right now we do not want to "announce" outgoing messengers 
            // because they get pooled and so must not be grabbed by a listener.
            // If "announcing" is to be done, that should be by the endpoint
            // and probably with a subtly different interface.

            Messenger result = new HttpClientMessenger(servletHttpTransport, publicAddress, destAddr);

            synchronized( messengers ) {
                messengers.put(result, null);
            }

            return result;
        } catch (SocketTimeoutException noConnect) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn("Could not connect to " + destAddr + " : " + noConnect.getMessage());
            }
        } catch (ConnectException noConnect) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn("Failed to connect to " + destAddr + " : " + noConnect.getMessage());
            }
        } catch (Throwable e) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn("Could not make messenger for " + destAddr, e);
            }
        }

        // If we got here, we failed.
        return null;
    }

    /**
     *  {@inheritDoc}
     **/
    public boolean isPropagateEnabled() {
        
        return false;
    }

    /**
     *  {@inheritDoc}
     **/
    public boolean isPropagationSupported() {
        
        return false;
    }

    /**
     *  {@inheritDoc}
     **/
    public void propagate(Message msg, String serviceName, String serviceParams, String prunePeer) {
        // propagate is not supported on this MessageSender
    }

    /**
     * {@inheritDoc}
     **/
    public boolean ping(EndpointAddress addr) {
        if (LOG.isEnabledFor(Level.DEBUG)) {
            LOG.debug("Using http client sender to ping " + addr);
        }
        
        Messenger messenger = getMessenger(addr, null);

        // XXX pool this messenger.
        // Ping obsolete. And do not announce an outgoing messenger

        boolean pong = 0 != (Messenger.USABLE & messenger.getState());
        
        messenger.close();
        
        return pong;
    }

    /**
     *  {@inheritDoc}
     **/
    public String getProtocolName() {
        return servletHttpTransport.HTTP_PROTOCOL_NAME;
    }

    /**
     *  {@inheritDoc}
     **/
    public EndpointService getEndpointService() {
        return servletHttpTransport.getEndpointService();
    }
}