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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.management; | ||
| 27 | |||
| 28 | import com.sun.management.GarbageCollectorMXBean; | ||
| 29 | import com.sun.management.GarbageCollectionNotificationInfo; | ||
| 30 | import java.lang.management.ManagementFactory; | ||
| 31 | import java.lang.management.MemoryPoolMXBean; | ||
| 32 | import java.lang.management.MemoryUsage; | ||
| 33 | |||
| 34 | import com.sun.management.GcInfo; | ||
| 35 | import javax.management.openmbean.CompositeData; | ||
| 36 | import javax.management.MBeanInfo; | ||
| 37 | import javax.management.MBeanAttributeInfo; | ||
| 38 | import javax.management.ObjectName; | ||
| 39 | import javax.management.MBeanNotificationInfo; | ||
| 40 | import javax.management.Notification; | ||
| 41 | import javax.management.NotificationFilter; | ||
| 42 | import javax.management.NotificationListener; | ||
| 43 | import javax.management.ListenerNotFoundException; | ||
| 44 | |||
| 45 | import java.util.List; | ||
| 46 | import java.util.ListIterator; | ||
| 47 | import java.util.Map; | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Implementation class for the garbage collector. | ||
| 51 | * Standard and committed hotspot-specific metrics if any. | ||
| 52 | * | ||
| 53 | * ManagementFactory.getGarbageCollectorMXBeans() returns a list | ||
| 54 | * of instances of this class. | ||
| 55 | */ | ||
| 56 | class GarbageCollectorImpl extends MemoryManagerImpl | ||
| 57 | implements GarbageCollectorMXBean { | ||
| 58 | |||
| 59 | GarbageCollectorImpl(String name) { | ||
| 60 | super(name); | ||
| 61 | } | ||
| 62 | |||
| 63 | public native long getCollectionCount(); | ||
| 64 | public native long getCollectionTime(); | ||
| 65 | |||
| 66 | |||
| 67 | // The memory pools are static and won't be changed. | ||
| 68 | // TODO: If the hotspot implementation begins to have pools | ||
| 69 | // dynamically created and removed, this needs to be modified. | ||
| 70 | private String[] poolNames = null; | ||
| 71 | synchronized String[] getAllPoolNames() { | ||
| 72 | if (poolNames == null) { | ||
| 73 | List pools = ManagementFactory.getMemoryPoolMXBeans(); | ||
| 74 | poolNames = new String[pools.size()]; | ||
| 75 | int i = 0; | ||
| 76 | for (ListIterator iter = pools.listIterator(); | ||
| 77 | iter.hasNext(); | ||
| 78 | i++) { | ||
| 79 | MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next(); | ||
| 80 | poolNames[i] = p.getName(); | ||
| 81 | } | ||
| 82 | } | ||
| 83 | return poolNames; | ||
| 84 | } | ||
| 85 | |||
| 86 | // Sun JDK extension | ||
| 87 | private GcInfoBuilder gcInfoBuilder; | ||
| 88 | |||
| 89 | private synchronized GcInfoBuilder getGcInfoBuilder() { | ||
| 90 | if(gcInfoBuilder == null) { | ||
| 91 | gcInfoBuilder = new GcInfoBuilder(this, getAllPoolNames()); | ||
| 92 | } | ||
| 93 | return gcInfoBuilder; | ||
| 94 | } | ||
| 95 | |||
| 96 | public GcInfo getLastGcInfo() { | ||
| 97 | GcInfo info = getGcInfoBuilder().getLastGcInfo(); | ||
| 98 | return info; | ||
| 99 | } | ||
| 100 | |||
| 101 | private final static String notifName = | ||
| 102 | "javax.management.Notification"; | ||
| 103 | |||
| 104 | private final static String[] gcNotifTypes = { | ||
| 105 | GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION | ||
| 106 | }; | ||
| 107 | |||
| 108 | private MBeanNotificationInfo[] notifInfo = null; | ||
| 109 | public MBeanNotificationInfo[] getNotificationInfo() { | ||
| 110 | synchronized (this) { | ||
| 111 | if (notifInfo == null) { | ||
| 112 | notifInfo = new MBeanNotificationInfo[1]; | ||
| 113 | notifInfo[0] = new MBeanNotificationInfo(gcNotifTypes, | ||
| 114 | notifName, | ||
| 115 | "GC Notification"); | ||
| 116 | } | ||
| 117 | } | ||
| 118 | return notifInfo; | ||
| 119 | } | ||
| 120 | |||
| 121 | private static long seqNumber = 0; | ||
| 122 | private static long getNextSeqNumber() { | ||
| 123 | return ++seqNumber; | ||
| 124 | } | ||
| 125 | |||
| 126 | void createGCNotification(long timestamp, | ||
| 127 | String gcName, | ||
| 128 | String gcAction, | ||
| 129 | String gcCause, | ||
| 130 | GcInfo gcInfo) { | ||
| 131 | |||
| 132 | if (!hasListeners()) { | ||
| 133 | return; | ||
| 134 | } | ||
| 135 | |||
| 136 | Notification notif = new Notification(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION, | ||
| 137 | getObjectName(), | ||
| 138 | getNextSeqNumber(), | ||
| 139 | timestamp, | ||
| 140 | gcName); | ||
| 141 | GarbageCollectionNotificationInfo info = | ||
| 142 | new GarbageCollectionNotificationInfo(gcName, | ||
| 143 | gcAction, | ||
| 144 | gcCause, | ||
| 145 | gcInfo); | ||
| 146 | |||
| 147 | CompositeData cd = | ||
| 148 | GarbageCollectionNotifInfoCompositeData.toCompositeData(info); | ||
| 149 | notif.setUserData(cd); | ||
| 150 | sendNotification(notif); | ||
| 151 | } | ||
| 152 | |||
| 153 | public synchronized void addNotificationListener(NotificationListener listener, | ||
| 154 | NotificationFilter filter, | ||
| 155 | Object handback) | ||
| 156 | { | ||
| 157 | boolean before = hasListeners(); | ||
| 158 | super.addNotificationListener(listener, filter, handback); | ||
| 159 | boolean after = hasListeners(); | ||
| 160 | if (!before && after) { | ||
| 161 | setNotificationEnabled(this, true); | ||
| 162 | } | ||
| 163 | } | ||
| 164 | |||
| 165 | public synchronized void removeNotificationListener(NotificationListener listener) | ||
| 166 | throws ListenerNotFoundException { | ||
| 167 | boolean before = hasListeners(); | ||
| 168 | super.removeNotificationListener(listener); | ||
| 169 | boolean after = hasListeners(); | ||
| 170 | if (before && !after) { | ||
| 171 | setNotificationEnabled(this,false); | ||
| 172 | } | ||
| 173 | } | ||
| 174 | |||
| 175 | public synchronized void removeNotificationListener(NotificationListener listener, | ||
| 176 | NotificationFilter filter, | ||
| 177 | Object handback) | ||
| 178 | throws ListenerNotFoundException | ||
| 179 | { | ||
| 180 | boolean before = hasListeners(); | ||
| 181 | super.removeNotificationListener(listener,filter,handback); | ||
| 182 | boolean after = hasListeners(); | ||
| 183 | if (before && !after) { | ||
| 184 | setNotificationEnabled(this,false); | ||
| 185 | } | ||
| 186 | } | ||
| 187 | |||
| 188 | public ObjectName getObjectName() { | ||
| 189 | return Util.newObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE, getName()); | ||
| 190 | } | ||
| 191 | |||
| 192 | native void setNotificationEnabled(GarbageCollectorMXBean gc, | ||
| 193 | boolean enabled); | ||
| 194 | |||
| 195 | } | ||