remotemonitorpeerinfohandler.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.
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 *  The Sun Project JXTA(TM) Software License
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 *  modification, are permitted provided that the following conditions are met:
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 *     developed by Sun Microsystems, Inc. for JXTA(TM) technology." 
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 *  Please see the license information page at :
 *  <http://www.jxta.org/project/www/license.html> for instructions on use of 
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 *  This software consists of voluntary contributions made by many individuals 
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 *  http://www.jxta.org.
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 */
package net.jxta.impl.peer;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.Hashtable;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Logger;
import java.util.logging.Level;
import net.jxta.logging.Logging;

import net.jxta.document.Element;
import net.jxta.protocol.PeerInfoQueryMessage;
import net.jxta.protocol.PeerInfoResponseMessage;
import net.jxta.peergroup.PeerGroup;
import net.jxta.exception.PeerGroupException;
import net.jxta.peer.PeerInfoService;
import net.jxta.peergroup.PeerGroupID;

import net.jxta.meter.MonitorEvent;
import net.jxta.meter.MonitorException;
import net.jxta.meter.MonitorFilter;
import net.jxta.meter.MonitorFilterException;
import net.jxta.meter.MonitorListener;
import net.jxta.meter.MonitorReport;
import net.jxta.meter.MonitorResources;
import net.jxta.meter.PeerMonitorInfo;
import net.jxta.meter.PeerMonitorInfoEvent;
import net.jxta.meter.PeerMonitorInfoListener;
import net.jxta.meter.ServiceMonitorFilter;
import net.jxta.peer.PeerID;
import net.jxta.util.documentSerializable.DocumentSerializableUtilities;
import net.jxta.util.documentSerializable.DocumentSerializationException;
import net.jxta.impl.util.TimerThreadNamer;

class RemoteMonitorPeerInfoHandler implements PeerInfoHandler {
    public static final String MONITOR_HANDLER_NAME = "Monitor";
    public static final int MAX_LEASE = 5 * 60 * 1000; // 5 minutes
    public static final int MIN_LEASE = 60 * 1000; // 1 minute

    private static final Random rand = new Random();
    private final static Logger LOG = Logger.getLogger(RemoteMonitorPeerInfoHandler.class.getName());

    private Hashtable<Integer, RequestInfo> requestInfos = new Hashtable<Integer, RequestInfo>();
    private Hashtable<Integer, LeaseInfo> leaseInfos = new Hashtable<Integer, LeaseInfo>();
    private Hashtable<Integer, Long> timeouts = new Hashtable<Integer, Long>();
    private PeerGroup peerGroup;
    private PeerInfoServiceImpl peerInfoServiceImpl;
    private Timer timer = new Timer(true);

    RemoteMonitorPeerInfoHandler(PeerGroup peerGroup, PeerInfoServiceImpl peerInfoServiceImpl) {
        this.peerGroup = peerGroup;
        this.peerInfoServiceImpl = peerInfoServiceImpl;
        timer.schedule(new TimerThreadNamer("RemoteMonitorPeerInfo timer for " + peerGroup.getPeerGroupID()), 0);
    }

    public void stop() {
        timer.cancel();
    }

    private int getNextLeaseId() {
        int id;
        synchronized (rand) {
            id = rand.nextInt(Integer.MAX_VALUE);
        }
        return id;
    }

    private class RequestInfo {
        long requestTime = System.currentTimeMillis();
        PeerID peerId;
        int queryId;
        int origRequestId;
        MonitorListener monitorListener;
        PeerMonitorInfoListener peerMonitorInfoListener;
        long timeout;
        long validUntil;
        boolean responseReceived = false;
        int leaseId; // other guys leaseId.
        long requestedLease;
        PeerInfoMessenger peerInfoMessenger;
        RequestInfo(PeerID peerId, int queryId, MonitorListener monitorListener, long timeout, PeerInfoMessenger peerInfoMessenger) {
            this(peerId, queryId, timeout, peerInfoMessenger);
            this.monitorListener = monitorListener;
        }

        RequestInfo(PeerID peerId, int queryId, PeerMonitorInfoListener peerMonitorInfoListener, long timeout, PeerInfoMessenger peerInfoMessenger) {
            this(peerId, queryId, timeout, peerInfoMessenger);
            this.peerMonitorInfoListener = peerMonitorInfoListener;
        }

        RequestInfo(PeerID peerId, int queryId, long timeout, PeerInfoMessenger peerInfoMessenger) {
            this.peerId = peerId;
            this.queryId = queryId;
            this.timeout = timeout;
            this.peerInfoMessenger = peerInfoMessenger;
            this.validUntil = System.currentTimeMillis() + timeout;
        }
    }


    private class LeaseInfo {
        int leaseId;
        PeerID peerID; // Peer that requested the lease
        int queryId; // The other guy's query Id
        MonitorListener monitorListener;
        long validUntil;
        boolean listenerAddedToWorldGroup = false;
        PeerGroup worldGroup;
        PeerInfoMessenger peerInfoMessenger;
        LeaseInfo(int leaseId, PeerID peerID, int queryId, MonitorListener monitorListener, long leaseLength, PeerInfoMessenger peerInfoMessenger) {
            this.leaseId = leaseId;
            this.peerID = peerID;
            this.queryId = queryId;
            this.monitorListener = monitorListener;
            this.peerInfoMessenger = peerInfoMessenger;
            validUntil = System.currentTimeMillis() + leaseLength;
        }

    }

    public void getPeerMonitorInfo(final PeerID peerID, PeerMonitorInfoListener peerMonitorInfoListener, long timeout, PeerInfoMessenger peerInfoMessenger) throws MonitorException {
        int queryId = peerInfoServiceImpl.getNextQueryId();

        RemoteMonitorQuery remoteMonitorQuery = RemoteMonitorQuery.createPeerMonitorInfoQuery();
        peerInfoMessenger.sendPeerInfoRequest(queryId, peerID, MONITOR_HANDLER_NAME, remoteMonitorQuery);
        final RequestInfo requestInfo = new RequestInfo(peerID, queryId, peerMonitorInfoListener, timeout, peerInfoMessenger);
        requestInfos.put(queryId, requestInfo);
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                if (!requestInfo.responseReceived) {
                    PeerMonitorInfoEvent peerMonitorInfoEvent = new PeerMonitorInfoEvent(peerID, null);

                    requestInfo.peerMonitorInfoListener.peerMonitorInfoNotReceived(peerMonitorInfoEvent);
                    requestInfos.remove(requestInfo.queryId);
                }
            }
        }, timeout);
    }

    public void getCumulativeMonitorReport(PeerID peerID, MonitorFilter monitorFilter, MonitorListener monitorListener, long timeout, PeerInfoMessenger peerInfoMessenger) throws MonitorException {
        int queryId = peerInfoServiceImpl.getNextQueryId();
        RemoteMonitorQuery remoteMonitorQuery = RemoteMonitorQuery.createGetCumulativeReportQuery(monitorFilter);
        peerInfoMessenger.sendPeerInfoRequest(queryId, peerID, MONITOR_HANDLER_NAME, remoteMonitorQuery);
        final RequestInfo requestInfo = new RequestInfo(peerID, queryId, monitorListener, timeout, peerInfoMessenger);
        requestInfos.put(queryId, requestInfo);
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                if (!requestInfo.responseReceived) {
                    requestInfos.remove(requestInfo.queryId);
                }
            }
        }, timeout);
    }