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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+
26+package sun.management;
27+
28+import java.lang.management.ManagementFactory;
29+import java.lang.management.MemoryMXBean;
30+import java.lang.management.MemoryUsage;
31+import java.lang.management.MemoryNotificationInfo;
32+import java.lang.management.MemoryManagerMXBean;
33+import java.lang.management.MemoryPoolMXBean;
34+import javax.management.ObjectName;
35+import javax.management.MBeanNotificationInfo;
36+import javax.management.Notification;
37+import 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+ */
46+class 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+}