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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/management/MemoryImpl.java (1 of 18352 files). Show all

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java/pkg/sun/management/MemoryImpl.java+175−0
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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 sun.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 private MBeanNotificationInfo[] notifInfo = null;
119 public MBeanNotificationInfo[] getNotificationInfo() {
120 synchronized (this) {
121 if (notifInfo == null) {
122 notifInfo = new MBeanNotificationInfo[1];
123 notifInfo[0] = new MBeanNotificationInfo(notifTypes,
124 notifName,
125 "Memory Notification");
126 }
127 }
128 return notifInfo;
129 }
130
131 private static String getNotifMsg(String notifType) {
132 for (int i = 0; i < notifTypes.length; i++) {
133 if (notifType == notifTypes[i]) {
134 return notifMsgs[i];
135 }
136 }
137 return "Unknown message";
138 }
139
140 private static long seqNumber = 0;
141 private static long getNextSeqNumber() {
142 return ++seqNumber;
143 }
144
145 static void createNotification(String notifType,
146 String poolName,
147 MemoryUsage usage,
148 long count) {
149 MemoryImpl mbean = (MemoryImpl) ManagementFactory.getMemoryMXBean();
150 if (!mbean.hasListeners()) {
151 // if no listener is registered.
152 return;
153 }
154 long timestamp = System.currentTimeMillis();
155 String msg = getNotifMsg(notifType);
156 Notification notif = new Notification(notifType,
157 mbean.getObjectName(),
158 getNextSeqNumber(),
159 timestamp,
160 msg);
161 MemoryNotificationInfo info =
162 new MemoryNotificationInfo(poolName,
163 usage,
164 count);
165 CompositeData cd =
166 MemoryNotifInfoCompositeData.toCompositeData(info);
167 notif.setUserData(cd);
168 mbean.sendNotification(notif);
169 }
170
171 public ObjectName getObjectName() {
172 return Util.newObjectName(ManagementFactory.MEMORY_MXBEAN_NAME);
173 }
174
175}