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   1 /*
   2  * Copyright (c) 2001-2007 Sun Microsystems, Inc.  All rights reserved.
   3  *
   4  *  The Sun Project JXTA(TM) Software License
   5  *
   6  *  Redistribution and use in source and binary forms, with or without
   7  *  modification, are permitted provided that the following conditions are met:
   8  *
   9  *  1. Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *
  12  *  2. Redistributions in binary form must reproduce the above copyright notice,
  13  *     this list of conditions and the following disclaimer in the documentation
  14  *     and/or other materials provided with the distribution.
  15  *
  16  *  3. The end-user documentation included with the redistribution, if any, must
  17  *     include the following acknowledgment: "This product includes software
  18  *     developed by Sun Microsystems, Inc. for JXTA(TM) technology."
  19  *     Alternately, this acknowledgment may appear in the software itself, if
  20  *     and wherever such third-party acknowledgments normally appear.
  21  *
  22  *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
  23  *     not be used to endorse or promote products derived from this software
  24  *     without prior written permission. For written permission, please contact
  25  *     Project JXTA at http://www.jxta.org.
  26  *
  27  *  5. Products derived from this software may not be called "JXTA", nor may
  28  *     "JXTA" appear in their name, without prior written permission of Sun.
  29  *
  30  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
  31  *  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  32  *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
  33  *  MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  36  *  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  37  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  38  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  39  *  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  *
  41  *  JXTA is a registered trademark of Sun Microsystems, Inc. in the United
  42  *  States and other countries.
  43  *
  44  *  Please see the license information page at :
  45  *  <http://www.jxta.org/project/www/license.html> for instructions on use of
  46  *  the license in source files.
  47  *
  48  *  ====================================================================
  49  *
  50  *  This software consists of voluntary contributions made by many individuals
  51  *  on behalf of Project JXTA. For more information on Project JXTA, please see
  52  *  http://www.jxta.org.
  53  *
  54  *  This license is based on the BSD license adopted by the Apache Foundation.
  55  */
  56
  57 package net.jxta.impl.meter;
  58
  59
  60 import net.jxta.meter.*;
  61 import java.util.*;
  62
  63
  64 public class ServiceMonitorPulseInfo {
  65     public static final int NOT_PULSING = MonitorManager.NOT_PULSING;
  66
  67     private MonitorManager monitorManager;
  68     ServiceMonitor serviceMonitor;
  69     private LinkedList<RegisteredServiceMonitorFilter> registeredServiceMonitorFilters = new LinkedList<RegisteredServiceMonitorFilter>();
  70     private int pulseRateIndex = NOT_PULSING; // quickestReportRateIndex registered for this service
  71     private long pulseRate = NOT_PULSING; // quickestReportRate registered for this service
  72     private int filtersPerRate[];
  73     private boolean pulsing;
  74
  75     private class RegisteredServiceMonitorFilter {
  76         ServiceMonitorFilter serviceMonitorFilter;
  77         int reportRateIndex;
  78
  79         RegisteredServiceMonitorFilter(ServiceMonitorFilter serviceMonitorFilter, int reportRateIndex) {
  80             this.serviceMonitorFilter = serviceMonitorFilter;
  81             this.reportRateIndex = reportRateIndex;
  82         }
  83     }
  84
  85     public ServiceMonitorPulseInfo() {}
  86
  87     ServiceMonitorPulseInfo(MonitorManager monitorManager, ServiceMonitor serviceMonitor) {
  88         this.monitorManager = monitorManager;
  89         this.serviceMonitor = serviceMonitor;
  90         filtersPerRate = new int[monitorManager.getReportRatesCount()];
  91     }
  92
  93     public ServiceMonitor getServiceMonitor() {
  94         return serviceMonitor;
  95     }
  96
  97     public int getPulseRateIndex() {
  98         return pulseRateIndex;
  99     }
 100
 101     public long getPulseRate() {
 102         return pulseRate;
 103     }
 104
 105     public boolean isPulsing() {
 106         return pulsing;
 107     }
 108
 109     public boolean isEvenPulseForRateIndex(int pulseRateIndex) {
 110         return monitorManager.isEvenPulseForRateIndex(pulseRateIndex);
 111     }
 112
 113     public boolean isRegisteredFilterForRate(int pulseRateIndex) {
 114         return (filtersPerRate[pulseRateIndex] != 0);
 115     }
 116
 117     void registerServiceMonitorFilter(ServiceMonitorFilter serviceMonitorFilter, int reportRateIndex, long reportRate) {
 118         RegisteredServiceMonitorFilter registeredServiceMonitorFilter = new RegisteredServiceMonitorFilter(serviceMonitorFilter
 119                 ,
 120                 reportRateIndex);
 121
 122         registeredServiceMonitorFilters.add(registeredServiceMonitorFilter);
 123
 124         filtersPerRate[reportRateIndex]++;
 125
 126         if ((pulseRateIndex == NOT_PULSING) || (reportRateIndex < pulseRateIndex)) {
 127             int oldPulseRateIndex = pulseRateIndex;
 128
 129             pulseRateIndex = reportRateIndex;
 130             pulseRate = reportRate;
 131             pulsing = true;
 132             if (serviceMonitor instanceof ServiceMonitorImpl) {
 133                 ((ServiceMonitorImpl) serviceMonitor).resetPulseRate(this, oldPulseRateIndex);
 134             }
 135         }
 136
 137         boolean newRate = (filtersPerRate[reportRateIndex] == 1);
 138
 139         serviceMonitor.serviceMonitorFilterRegistered(serviceMonitorFilter, reportRateIndex, reportRate, newRate);
 140     }
 141
 142     boolean deregisterServiceMonitorFilter(ServiceMonitorFilter serviceMonitorFilter, int reportRateIndex, long reportRate) {
 143         boolean removed = false;
 144
 145         for (Iterator<RegisteredServiceMonitorFilter> i = registeredServiceMonitorFilters.iterator(); i.hasNext();) {
 146             RegisteredServiceMonitorFilter registeredMonitorFilter = i.next();
 147
 148             if ((registeredMonitorFilter.serviceMonitorFilter == serviceMonitorFilter)
 149                     && (registeredMonitorFilter.reportRateIndex == reportRateIndex)) {
 150                 i.remove();
 151                 removed = true;
 152                 break;
 153             }
 154         }
 155
 156         if (!removed) { // Fix-Me: This should never happen if Monitor Manager works properly.
 157             return false;
 158         }
 159
 160         filtersPerRate[reportRateIndex]--;
 161
 162         serviceMonitor.serviceMonitorFilterDeregistered(serviceMonitorFilter, reportRateIndex, reportRate
 163                 ,
 164                 filtersPerRate[reportRateIndex] == 0);
 165
 166         if ((filtersPerRate[reportRateIndex] == 0) && (reportRateIndex == pulseRateIndex)) {
 167             // pulseRateSlowing Down
 168             int newPulseRateIndex = NOT_PULSING;
 169
 170             for (int i = pulseRateIndex; i < filtersPerRate.length; i++) {
 171                 if (filtersPerRate[i] != 0) {
 172                     newPulseRateIndex = i;
 173                     break;
 174                 }
 175             }
 176
 177             int oldPulserRateIndex = pulseRateIndex;
 178
 179             pulseRateIndex = newPulseRateIndex;
 180
 181             if (newPulseRateIndex != NOT_PULSING) {
 182                 pulseRate = monitorManager.getReportRate(pulseRateIndex);
 183                 pulsing = true;
 184             } else {
 185                 pulseRate = NOT_PULSING;
 186                 pulsing = false;
 187             }
 188
 189             if (serviceMonitor instanceof ServiceMonitorImpl) {
 190                 ((ServiceMonitorImpl) serviceMonitor).resetPulseRate(this, oldPulserRateIndex);
 191             }
 192         }
 193         return removed;
 194     }
 195 }