1 /*
2 * Copyright (c) 2011, 2015, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 7036199
27 * @summary Check that GarbageCollection notification are thrown by every GarbageCollectorMXBean
28 * @author Frederic Parain
29 * @requires vm.opt.ExplicitGCInvokesConcurrent == null | vm.opt.ExplicitGCInvokesConcurrent == false
30 * @modules jdk.management
31 * @run main/othervm GarbageCollectionNotificationTest
32 */
33
34 import java.util.*;
35 import java.lang.management.*;
36 import java.lang.reflect.*;
37 import javax.management.*;
38 import javax.management.openmbean.*;
39 import com.sun.management.GarbageCollectionNotificationInfo;
40 import com.sun.management.GcInfo;
41 import java.security.AccessController;
42 import java.security.PrivilegedAction;
43 import java.lang.reflect.Field;
44
45 public class GarbageCollectionNotificationTest {
46 private static HashMap<String,Boolean> listenerInvoked = new HashMap<String,Boolean>();
47 static volatile long count = 0;
48 static volatile long number = 0;
49 static Object synchronizer = new Object();
50
51 static class GcListener implements NotificationListener {
52 public void handleNotification(Notification notif, Object handback) {
53 String type = notif.getType();
54 if (type.equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
55 GarbageCollectionNotificationInfo gcNotif =
56 GarbageCollectionNotificationInfo.from((CompositeData) notif.getUserData());
57 String source = ((ObjectName)notif.getSource()).getCanonicalName();
58 synchronized(synchronizer) {
59 if(!listenerInvoked.get(source)) {
60 listenerInvoked.put(((ObjectName)notif.getSource()).getCanonicalName(),true);
61 count++;
62 if(count >= number) {
63 synchronizer.notify();
64 }
65 }
66 }
67 }
68 }
69 }
70
71 public static void main(String[] args) throws Exception {
72 MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
73 final Boolean isNotificationSupported = AccessController.doPrivileged (new PrivilegedAction<Boolean>() {
74 public Boolean run() {
75 try {
76 Class cl = Class.forName("sun.management.VMManagementImpl");
77 Field f = cl.getDeclaredField("gcNotificationSupport");
78 f.setAccessible(true);
79 return f.getBoolean(null);
80 } catch(ClassNotFoundException e) {
81 return false;
82 } catch(NoSuchFieldException e) {
83 return false;
84 } catch(IllegalAccessException e) {
85 return false;
86 }
87 }
88 });
89 if(!isNotificationSupported) {
90 System.out.println("GC Notification not supported by the JVM, test skipped");
91 return;
92 }
93 final ObjectName gcMXBeanPattern =
94 new ObjectName("java.lang:type=GarbageCollector,*");
95 Set<ObjectName> names =
96 mbs.queryNames(gcMXBeanPattern, null);
97 if (names.isEmpty())
98 throw new Exception("Test incorrect: no GC MXBeans");
99 number = names.size();
100 for (ObjectName n : names) {
101 if(mbs.isInstanceOf(n,"javax.management.NotificationEmitter")) {
102 listenerInvoked.put(n.getCanonicalName(),false);
103 GcListener listener = new GcListener();
104 mbs.addNotificationListener(n, listener, null, null);
105 }
106 }
107 // Invocation of System.gc() to trigger major GC
108 System.gc();
109 // Allocation of many short living and small objects to trigger minor GC
110 Object data[] = new Object[32];
111 for(int i = 0; i<100000000; i++) {
112 data[i%32] = new int[8];
113 }
114 int wakeup = 0;
115 synchronized(synchronizer) {
116 while(count != number) {
117 synchronizer.wait(10000);
118 wakeup++;
119 if(wakeup > 10)
120 break;
121 }
122 }
123 for (String source : listenerInvoked.keySet()) {
124 if(!listenerInvoked.get(source))
125 throw new Exception("Test incorrect: notifications have not been sent for "
126 + source);
127 }
128 System.out.println("Test passed");
129 }
130 }