resolverserviceimpl.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: ResolverServiceImpl.java,v 1.2 2002/03/04 21:43:01 echtcherbina Exp $
 */
package net.jxta.impl.resolver;

import java.util.Enumeration;
import java.util.Vector;
import java.util.Hashtable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

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

import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.Document;
import net.jxta.document.MimeMediaType;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointMessenger;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.MessageElementEnumeration;
import net.jxta.exception.DiscardQueryException;
import net.jxta.exception.NoResponseException;
import net.jxta.exception.PeerGroupException;
import net.jxta.exception.ResendQueryException;
import net.jxta.exception.ServiceNotFoundException;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.peer.PeerID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.protocol.ModuleImplAdvertisement;
import net.jxta.protocol.ResolverQueryMsg;
import net.jxta.protocol.ResolverResponseMsg;
import net.jxta.rendezvous.RendezVousService;
import net.jxta.resolver.QueryHandler;
import net.jxta.resolver.ResolverService;
import net.jxta.service.Service;
import net.jxta.util.StringEnumeration;

import net.jxta.impl.rendezvous.RendezVousPropagateMessage;
import net.jxta.impl.protocol.ResolverQuery;
import net.jxta.impl.protocol.ResolverResponse;


/**
 * ResolverService Service provides a generic mechanism for jxta Services
 * to send "Queries", and receive "Responses".  It removes the burden for
 * registered handlers in deal with :
 *
 *   - Setting message tags, to ensure uniqueness of tags and
 *     ensures that messages are sent to correct address, and group
 *   - Authentication, and Verification of credentials
 *   - drop rogue messages
 *
 * ResolverService Service does not proccess the queries, nor does it not compose
 * reponses. Handling of queries, and composition of responses are left up
 * to the registered handlers. Services that wish to handle queries,
 * and generate reponses must implement <Code>QueryHandler<Code>
 *
 * Message Format :
 *
 * A Query message
 *
 * <?xml version="1.0" standalone='yes'?>
 * <ResolverQuery>
 *   <handlername> name </handlername>
 *   <credential> uri </credential>
 *   <queryid> id </queryid>
 *   <query> query </query>
 * </ResolverQuery>
 *
 * Note: queryid is unique to the originating node only, it can be utilized to
 * match queries to responses.
 *
 * A Response Message
 *
 * <?xml version="1.0" standalone='yes'?>
 * <ResolverResponse>
 *   <handlername> name </handlername>
 *   <credential> uri </credential>
 *   <queryid> id </queryid>
 *   <response> response </response>
 * </ResolverResponse>
 *
 * Note: queryid is unique to the originating node only, it can be
 * utilized to match queries to responses
 *
 * @version $Revision: 1.2 $
 * @see net.jxta.protocol.ResolverQueryMsg;
 * @see net.jxta.protocol.ResolverResponseMsg;
 * @since JXTA 1.0
 * Tag  $Name: STABLE_07082002 $
 * @since JXTA 1.0
 */

public class ResolverServiceImpl implements ResolverService, EndpointListener {

        private static final Category LOG =
                Category.getInstance(ResolverServiceImpl.class.getName());

        public  String outQueNameShort="ORes";
        public  String  inQueNameShort="IRes";
        public  String outQueName="ORes";
        public  String  inQueName="IRes";
        private EndpointService endpoint;
        private Hashtable handlers = new Hashtable(50);
        private PeerGroup myGroup=null;
        private String localPeerId = null;
        private RendezVousService rendezvous = null;
        private ModuleImplAdvertisement implAdvertisement = null;
        private RecvDemux recvMux = null;
        private String handlerName = null;

        // Until we make a factory for this
        private EndpointAddress mkAddress(String destPeer,
                                          String serv, String parm) {
                try
                {
                        PeerID asID = (PeerID) IDFactory.fromURL(new URL(destPeer));
                        String asString = "jxta://" + asID.getUniqueValue().toString();

                        EndpointAddress addr = endpoint.newEndpointAddress(asString);
                        addr.setServiceName(serv);
                        addr.setServiceParameter(parm);
                        return addr;
                }
                catch (Exception e)
                {
                        if (LOG.isEnabledFor(Priority.WARN))
                                LOG.warn("Invalid peerID string " + destPeer);
                        return null;
                }
        }

        /**
         * Default constructor
         */
        public ResolverServiceImpl ( ) {

        }

        /**
         * Supply arguments and starts this service if it hadn't started by itself.
         *
         * Currently this service starts by itself and does not expect
         * arguments.
         *
         * @param arg A table of strings arguments.
         * @return int status indication.
         */
        public int startApp(String[] arg) {
                rendezvous        = myGroup.getRendezVousService();
                try
                {
                        rendezvous.addPropagateListener(handlerName
                                                        + outQueName,this);
                        rendezvous.addPropagateListener(handlerName
                                                        + inQueName,recvMux);
                }
                catch (Exception e)
                {
                        if (LOG.isEnabledFor(Priority.ERROR))
                                LOG.error("failed to add listeners", e );
                        return 1;
                }
                return 0;
        }

        /**
         * Ask this service to stop.
         *
         * let's detach from the endpoint
         */
        public void stopApp() {
                try
                {
                        rendezvous.removePropagateListener(handlerName
                                                           + outQueName,this);
                        rendezvous.removePropagateListener(handlerName
                                                           + inQueName,recvMux);
                }
                catch (Exception weDidOurBest)
                {
                }
        }

        /**
         * Service objects are not manipulated directly to protect usage
         * of the service. A Service interface is returned to access the service
         * methods.
         *
         * @return Service public interface of the service
         *
         * @since JXTA 1.0
         */
        public Service getInterface() {
                return new ResolverServiceInterface(this);
        }


        /**
         * Returns the advertisement for that service.
         *
         * @return Advertisement the advertisement.
         *
         * @since JXTA 1.0
         */
        public Advertisement getImplAdvertisement() {
                return implAdvertisement;
        }

        /**
         * Registers the given ResolveHandler.
         *
         * @param name The name under which this handler is known.
         * @param handler The handler.
         * @return The previous handler registered under this name
         */
        public synchronized QueryHandler registerHandler( String name, QueryHandler handler )
        {
                return (QueryHandler)handlers.put( name, handler );

        }

        /**
         * unregisters the given ResolveHandler.
         *
         * @param name The name under which this handler is known.
         * @param handler The handler.
         * @return The previous handler registered under this name