1/* 2 * Copyright (c) 2003, 2008, 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 26package sun.management; 27 28import java.lang.management.ManagementFactory; 29import java.lang.management.MemoryMXBean; 30import java.lang.management.MemoryUsage; 31import java.lang.management.MemoryNotificationInfo; 32import java.lang.management.MemoryManagerMXBean; 33import java.lang.management.MemoryPoolMXBean; 34import javax.management.ObjectName; 35import javax.management.MBeanNotificationInfo; 36import javax.management.Notification; 37import javax.management.openmbean.CompositeData; 38 39/** 40 * Implementation class for the memory subsystem. 41 * Standard and committed hotspot-specific metrics if any. 42 * 43 * ManagementFactory.getMemoryMXBean() returns an instance 44 * of this class. 45 */ 46class MemoryImpl extends NotificationEmitterSupport 47 implements MemoryMXBean { 48 49 private final VMManagement jvm; 50 51 private static MemoryPoolMXBean[] pools = null; 52 private static MemoryManagerMXBean[] mgrs = null; 53 54 /** 55 * Constructor of MemoryImpl class 56 */ 57 MemoryImpl(VMManagement vm) { 58 this.jvm = vm; 59 } 60 61 public int getObjectPendingFinalizationCount() { 62 return jdk.internal.misc.VM.getFinalRefCount(); 63 } 64 65 public void gc() { 66 Runtime.getRuntime().gc(); 67 } 68 69 // Need to make a VM call to get coherent value 70 public MemoryUsage getHeapMemoryUsage() { 71 return getMemoryUsage0(true); 72 } 73 74 public MemoryUsage getNonHeapMemoryUsage() { 75 return getMemoryUsage0(false); 76 } 77 78 public boolean isVerbose() { 79 return jvm.getVerboseGC(); 80 } 81 82 public void setVerbose(boolean value) { 83 Util.checkControlAccess(); 84 85 setVerboseGC(value); 86 } 87 88 // The current Hotspot implementation does not support 89 // dynamically add or remove memory pools & managers. 90 static synchronized MemoryPoolMXBean[] getMemoryPools() { 91 if (pools == null) { 92 pools = getMemoryPools0(); 93 } 94 return pools; 95 } 96 static synchronized MemoryManagerMXBean[] getMemoryManagers() { 97 if (mgrs == null) { 98 mgrs = getMemoryManagers0(); 99 } 100 return mgrs; 101 } 102 private static native MemoryPoolMXBean[] getMemoryPools0(); 103 private static native MemoryManagerMXBean[] getMemoryManagers0(); 104 private native MemoryUsage getMemoryUsage0(boolean heap); 105 private native void setVerboseGC(boolean value); 106 107 private final static String notifName = 108 "javax.management.Notification"; 109 private final static String[] notifTypes = { 110 MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED, 111 MemoryNotificationInfo.MEMORY_COLLECTION_THRESHOLD_EXCEEDED 112 }; 113 private final static String[] notifMsgs = { 114 "Memory usage exceeds usage threshold", 115 "Memory usage exceeds collection usage threshold" 116 }; 117 118 public MBeanNotificationInfo[] getNotificationInfo() { 119 return new MBeanNotificationInfo[] { 120 new MBeanNotificationInfo(notifTypes, notifName, "Memory Notification") 121 }; 122 } 123 124 private static String getNotifMsg(String notifType) { 125 for (int i = 0; i < notifTypes.length; i++) { 126 if (notifType == notifTypes[i]) { 127 return notifMsgs[i]; 128 } 129 } 130 return "Unknown message"; 131 } 132 133 private static long seqNumber = 0; 134 private static long getNextSeqNumber() { 135 return ++seqNumber; 136 } 137 138 static void createNotification(String notifType, 139 String poolName, 140 MemoryUsage usage, 141 long count) { 142 MemoryImpl mbean = (MemoryImpl) ManagementFactory.getMemoryMXBean(); 143 if (!mbean.hasListeners()) { 144 // if no listener is registered. 145 return; 146 } 147 long timestamp = System.currentTimeMillis(); 148 String msg = getNotifMsg(notifType); 149 Notification notif = new Notification(notifType, 150 mbean.getObjectName(), 151 getNextSeqNumber(), 152 timestamp, 153 msg); 154 MemoryNotificationInfo info = 155 new MemoryNotificationInfo(poolName, 156 usage, 157 count); 158 CompositeData cd = 159 MemoryNotifInfoCompositeData.toCompositeData(info); 160 notif.setUserData(cd); 161 mbean.sendNotification(notif); 162 } 163 164 public ObjectName getObjectName() { 165 return Util.newObjectName(ManagementFactory.MEMORY_MXBEAN_NAME); 166 } 167 168} 169