1 /*
2 * Copyright (c) 2010, 2014, 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 import java.io.BufferedReader;
25 import java.io.InputStream;
26 import java.io.InputStreamReader;
27
28 import static jdk.testlibrary.Asserts.assertGreaterThan;
29 import jdk.testlibrary.ProcessTools;
30
31 import com.sun.tools.attach.AttachNotSupportedException;
32 import com.sun.tools.attach.VirtualMachine;
33
34 import sun.tools.attach.HotSpotVirtualMachine;
35
36 /*
37 * @test
38 * @bug 6942989
39 * @summary Check for WeakReference leak in Logger and anonymous Logger objects
40 * @library /lib/testlibrary
41 * @build jdk.testlibrary.*
42 * @run main/othervm TestLoggerWeakRefLeak Logger
43 * @run main/othervm TestLoggerWeakRefLeak AnonymousLogger
44 */
45 public class TestLoggerWeakRefLeak {
46
47 private static final String TARGET_CLASS = "java.lang.ref.WeakReference";
48 private static final int INSTANCE_COUNT = 100;
49 private static int loggerCount = 0;
50
51 public static void main(String[] args) throws Exception {
52 if (args[0].equals("Test for WeakReference leak in AnonymousLogger object")) {
53 System.out.println("AnonymousLogger");
54 testIfLeaking(TestLoggerWeakRefLeak::callAnonymousLogger);
55 } else {
56 System.out.println("Test for WeakReference leak in Logger object");
57 testIfLeaking(TestLoggerWeakRefLeak::callLogger);
58 }
59 }
60
61 /**
62 * For these particular WeakReference leaks, the count was always observed
63 * to be increasing so if decreasing or the same count is observed,
64 * then there is no leak.
65 */
66 private static void testIfLeaking(Runnable callLogger) throws Exception {
67 long count = 0;
68 int instanceCount = 0;
69 int previousInstanceCount = 0;
70 int increasingCount = 0;
71 int decreasingCount = 0;
72
73 while (true) {
74 callLogger.run();
75 count += INSTANCE_COUNT;
76
77 if ((count % 1000) == 0) {
78 System.out.println("call count = " + count);
79
80 instanceCount = getInstanceCountFromHeapHisto();
81 if (instanceCount > previousInstanceCount) {
82 increasingCount++;
83 } else {
84 decreasingCount++;
85 System.out.println("increasing count: " + increasingCount);
86 System.out.println("decreasing or the same count: " + decreasingCount);
87 System.out.println("Test passed: decreasing or the same instance count is observed");
88 break;
89 }
90 previousInstanceCount = instanceCount;
91 }
92
93 delayExecution();
94 }
95 }
96
97 /**
98 * This Logger call is leaking two different WeakReferences:
99 * - one in LogManager.LogNode
100 * - one in Logger.kids
101 */
102 private static void callLogger() {
103 for (int i = 0; i < INSTANCE_COUNT; i++) {
104 java.util.logging.Logger.getLogger("logger-" + loggerCount);
105 if (++loggerCount >= 25000) {
106 // Limit the Logger namespace used by the test so the weak refs
107 // in LogManager.loggers that are being properly managed
108 // don't skew the counts by too much.
109 loggerCount = 0;
110 }
111 }
112 }
113
114 /**
115 * This Logger call is leaking a WeakReference in Logger.kids
116 */
117 private static void callAnonymousLogger() {
118 for (int i = 0; i < INSTANCE_COUNT; i++) {
119 java.util.logging.Logger.getAnonymousLogger();
120 }
121 }
122
123 /**
124 * 'vm.heapHisto("-live")' will request a full GC
125 */
126 private static int getInstanceCountFromHeapHisto() throws AttachNotSupportedException, Exception {
127 int instanceCount = 0;
128
129 HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine
130 .attach(Integer.toString(ProcessTools.getProcessId()));
131 try {
132 try (InputStream heapHistoStream = vm.heapHisto("-live");
133 BufferedReader in = new BufferedReader(new InputStreamReader(heapHistoStream))) {
134 String inputLine;
135 while ((inputLine = in.readLine()) != null) {
136 if (inputLine.contains(TARGET_CLASS)) {
137 instanceCount = Integer.parseInt(inputLine
138 .split("[ ]+")[2]);
139 System.out.println("instance count: " + instanceCount);
140 break;
141 }
142 }
143 }
144 } finally {
145 vm.detach();
146 }
147
148 assertGreaterThan(instanceCount, 0, "No instances of " + TARGET_CLASS + " are found");
149
150 return instanceCount;
151 }
152
153 /**
154 * Delay for 1/10 of a second to avoid CPU saturation
155 */
156 private static void delayExecution() {
157 try {
158 Thread.sleep(100);
159 } catch (InterruptedException ie) {
160 // Ignore any exceptions
161 }
162 }
163
164 }