Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java

test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java

changeset 9671
e86bc9786d83
equal deleted inserted replaced
9669:32bc598624bd 9671:e86bc9786d83
1 /*
2 * Copyright (c) 2017, 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 public final class ReturnJNIWeak {
25 static {
26 System.loadLibrary("ReturnJNIWeak");
27 }
28
29 private static final class TestObject {
30 public final int value;
31
32 public TestObject(int value) {
33 this.value = value;
34 }
35 }
36
37 private static volatile TestObject testObject = null;
38
39 private static native void registerObject(Object o);
40 private static native void unregisterObject();
41 private static native Object getObject();
42
43 // Create the test object and record it both strongly and weakly.
44 private static void remember(int value) {
45 TestObject o = new TestObject(value);
46 registerObject(o);
47 testObject = o;
48 }
49
50 // Remove both strong and weak references to the current test object.
51 private static void forget() {
52 unregisterObject();
53 testObject = null;
54 }
55
56 // Verify the weakly recorded object
57 private static void checkValue(int value) throws Exception {
58 Object o = getObject();
59 if (o == null) {
60 throw new RuntimeException("Weak reference unexpectedly null");
61 }
62 TestObject t = (TestObject)o;
63 if (t.value != value) {
64 throw new RuntimeException("Incorrect value");
65 }
66 }
67
68 // Verify we can create a weak reference and get it back.
69 private static void testSanity() throws Exception {
70 System.out.println("running testSanity");
71 int value = 5;
72 try {
73 remember(value);
74 checkValue(value);
75 } finally {
76 forget();
77 }
78 }
79
80 // Verify weak ref value survives across collection if strong ref exists.
81 private static void testSurvival() throws Exception {
82 System.out.println("running testSurvival");
83 int value = 10;
84 try {
85 remember(value);
86 checkValue(value);
87 System.gc();
88 // Verify weak ref still has expected value.
89 checkValue(value);
90 } finally {
91 forget();
92 }
93 }
94
95 // Verify weak ref cleared if no strong ref exists.
96 private static void testClear() throws Exception {
97 System.out.println("running testClear");
98 int value = 15;
99 try {
100 remember(value);
101 checkValue(value);
102 // Verify still good.
103 checkValue(value);
104 // Drop reference.
105 testObject = null;
106 System.gc();
107 // Verify weak ref cleared as expected.
108 Object recorded = getObject();
109 if (recorded != null) {
110 throw new RuntimeException("expected clear");
111 }
112 } finally {
113 forget();
114 }
115 }
116
117 public static void main(String[] args) throws Exception {
118 testSanity();
119 testSurvival();
120 testClear();
121 }
122 }

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