peerinfoserviceimpl.java

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

/*
 *  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: PeerInfoServiceImpl.java,v 1.41 2004/10/09 23:42:01 bondolo Exp $
 */
package net.jxta.impl.peer;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;
import java.util.Hashtable;
import java.util.Random;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.URI;

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

import net.jxta.service.Service;
import net.jxta.endpoint.EndpointService;
import net.jxta.resolver.ResolverService;
import net.jxta.resolver.QueryHandler;
import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.Document;
import net.jxta.document.StructuredDocument;
import net.jxta.document.StructuredDocumentFactory;
import net.jxta.document.XMLDocument;
import net.jxta.document.MimeMediaType;
import net.jxta.document.Element;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.protocol.ResolverQueryMsg;
import net.jxta.protocol.ResolverResponseMsg;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.protocol.PeerAdvertisement;
import net.jxta.protocol.ModuleImplAdvertisement;
import net.jxta.protocol.PeerInfoQueryMessage;
import net.jxta.protocol.PeerInfoResponseMessage;
import net.jxta.peergroup.PeerGroup;
import net.jxta.exception.PeerGroupException;
import net.jxta.exception.ServiceNotFoundException;
import net.jxta.peer.PeerInfoService;
import net.jxta.peer.PeerInfoListener;
import net.jxta.peer.PeerInfoEvent;
import net.jxta.peergroup.PeerGroupID;
import net.jxta.credential.Credential;
import net.jxta.credential.AuthenticationCredential;
import net.jxta.membership.Authenticator;
import net.jxta.membership.MembershipService;
import net.jxta.impl.cm.Cm;
import net.jxta.impl.protocol.ResolverQuery;
import net.jxta.impl.protocol.ResolverResponse;
import net.jxta.impl.protocol.PeerInfoQueryMsg;
import net.jxta.impl.protocol.PeerInfoResponseMsg;
import net.jxta.impl.peer.PeerInfoServiceInterface;
import net.jxta.impl.util.EndpointServiceStatsFilter;
import net.jxta.exception.JxtaException;
import net.jxta.exception.PeerGroupException;

import net.jxta.meter.*;
import net.jxta.impl.meter.*;
import net.jxta.peer.*;
import net.jxta.util.*;
import net.jxta.platform.*;
import net.jxta.util.documentSerializable.*;

/**
 *  Peer Info provides a mechanism to obtain  information about peers.
 *
 */

public class PeerInfoServiceImpl implements PeerInfoService {

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

	/**
	 *  Time in milli seconds since midnight, January 1, 1970 UTC and when this
	 *  peer was started.
	 */
	private long startTime = 0;

	private ResolverService resolver = null;
	private PeerGroup pg = null;
	private EndpointService endpoint = null;
	private PeerID localPeerId = null;
	private ModuleImplAdvertisement implAdvertisement = null;
	private String resolverHandlerName = null;
	private MembershipService membership = null;
	private Credential credential = null;
	private StructuredDocument credentialDoc = null;
	private MonitorManager monitorManager;
	private Hashtable peerInfoHandlers = new Hashtable();
	private PipQueryHandler pipQueryHandler = new PipQueryHandler();
	private RemoteMonitorPeerInfoHandler remoteMonitorPeerInfoHandler;
	private PeerInfoMessenger resolverServicePeerInfoMessenger = new ResolverServicePeerInfoMessenger();

	private int nextQueryId = 1000;
	private static Random rand = new Random();

	// This static package public hashtable of registered PeerInfoServiceImpls
	// allows us to do Peergroup Monitoring via an IP Bridge to the PIP
	// See the documentation on the JXTA Monitor
	static Hashtable peerInfoServices = new Hashtable(); 
	
	int getNextQueryId() {
		int id = 0;
		synchronized(rand) {
			id = rand.nextInt(Integer.MAX_VALUE);
		}
		return id; 
	}
	
	/**
	 *  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) {

		/* Fix-Me: When MonitorService is a true service, this should be moved here from init()
        try {
        	if (MeterBuildSettings.METERING) 
				monitorManager = MonitorManager.registerMonitorManager(pg);		// Fix-Me: This will become a service lookup when MonitorService is a real service
        } catch (JxtaException e) {
            return -1;		// Fix-Me: This is related to the initialization sequence work on the dev list on load order
        }
        */

		remoteMonitorPeerInfoHandler = new RemoteMonitorPeerInfoHandler(pg, this);
		peerInfoHandlers.put(RemoteMonitorPeerInfoHandler.MONITOR_HANDLER_NAME, remoteMonitorPeerInfoHandler);
		
		resolver = pg.getResolverService();
		resolver.registerHandler(resolverHandlerName, pipQueryHandler);

		peerInfoServices.put(pg, this);
		return 0;
	}


	/**
	 *  Ask this service to stop. This request is currently ignored.
	 */
	public void stopApp() {
		
		peerInfoServices.remove(pg);
                peerInfoHandlers.remove(RemoteMonitorPeerInfoHandler.MONITOR_HANDLER_NAME);
                remoteMonitorPeerInfoHandler.stop();
		resolver.unregisterHandler(resolverHandlerName);

                if (MeterBuildSettings.METERING) {
			MonitorManager.unregisterMonitorManager(pg);
                }

		pg = null;
	}

	PeerInfoHandler getPeerInfoHandler(String name) { 
		return (PeerInfoHandler) peerInfoHandlers.get(name);
	}


	/**
	 *  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
	 */
	public Service getInterface() {
		return new PeerInfoServiceInterface(this);
	}


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


	/**
	 *  init is called by PeerGroup to init the Service
	 *
	 *@param  group
	 *@param  assignedID
	 *@param  impl
	 *@throws  PeerGroupException  throw any exception thrown during
	 *      obtaining Service
	 */

	public void init(PeerGroup group, ID assignedID, Advertisement impl)
	throws PeerGroupException {


		pg = group;
		
		endpoint = pg.getEndpointService();
		implAdvertisement = (ModuleImplAdvertisement) impl;
		localPeerId = pg.getPeerID();
		resolverHandlerName = assignedID.toString();

		// Fix-Me: When MonitorManager is a true Service, this should be moved to startApp()
        try {
        	if (MeterBuildSettings.METERING)