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 /* @test
25 * @bug 4268317 8132306 8175797
26 * @summary Test if Reference.enqueue() works properly with GC
27 * @run main ReferenceEnqueue
28 * @run main/othervm -Djdk.lang.ref.disableClearBeforeEnqueue=true ReferenceEnqueue
29 */
30
31 import java.lang.ref.*;
32 import java.util.ArrayList;
33 import java.util.List;
34
35 public class ReferenceEnqueue {
36
37 public static void main(String args[]) throws Exception {
38 for (int i=0; i < 5; i++) {
39 new WeakRef().run();
40 new ExplicitEnqueue().run();
41 }
42 System.out.println("Test passed.");
43 }
44
45 static class WeakRef {
46 final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
47 final Reference<Object> ref;
48 final int iterations = 1000;
70
71 if (ref.enqueue() == true) {
72 // enqueue() should return false since
73 // ref is already enqueued by the GC
74 throw new RuntimeException("Error: enqueue() returned true;"
75 + " expected false");
76 }
77
78 if (queue.poll() == null) {
79 // poll() should return ref enqueued by the GC
80 throw new RuntimeException("Error: poll() returned null;"
81 + " expected ref object");
82 }
83 }
84 }
85
86 static class ExplicitEnqueue {
87 final ReferenceQueue<Object> queue = new ReferenceQueue<>();
88 final List<Reference<Object>> refs = new ArrayList<>();
89 final int iterations = 1000;
90 final boolean disableClearBeforeEnqueue =
91 Boolean.getBoolean("jdk.lang.ref.disableClearBeforeEnqueue");
92
93 ExplicitEnqueue() {
94 this.refs.add(new SoftReference<>(new Object(), queue));
95 this.refs.add(new WeakReference<>(new Object(), queue));
96 // Can't test PhantomReference because get() always returns null.
97 }
98
99 void run() throws InterruptedException {
100 for (Reference<Object> ref : refs) {
101 if (ref.enqueue() == false) {
102 throw new RuntimeException("Error: enqueue failed");
103 }
104 if (disableClearBeforeEnqueue && ref.get() == null) {
105 throw new RuntimeException("Error: clearing should be disabled");
106 }
107 if (!disableClearBeforeEnqueue && ref.get() != null) {
108 throw new RuntimeException("Error: referent must be cleared");
109 }
110 }
111
112 System.gc();
113 for (int i = 0; refs.size() > 0 && i < iterations; i++) {
114 Reference<Object> ref = (Reference<Object>)queue.poll();
115 if (ref == null) {
116 System.gc();
117 Thread.sleep(100);
118 continue;
119 }
120
121 if (refs.remove(ref) == false) {
122 throw new RuntimeException("Error: unknown reference " + ref);
123 }
124 }
125
126 if (!refs.isEmpty()) {
127 throw new RuntimeException("Error: not all references are removed");
|
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 /* @test
25 * @bug 4268317 8132306 8175797
26 * @summary Test if Reference.enqueue() works properly with GC
27 * @run main ReferenceEnqueue
28 */
29
30 import java.lang.ref.*;
31 import java.util.ArrayList;
32 import java.util.List;
33
34 public class ReferenceEnqueue {
35
36 public static void main(String args[]) throws Exception {
37 for (int i=0; i < 5; i++) {
38 new WeakRef().run();
39 new ExplicitEnqueue().run();
40 }
41 System.out.println("Test passed.");
42 }
43
44 static class WeakRef {
45 final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
46 final Reference<Object> ref;
47 final int iterations = 1000;
69
70 if (ref.enqueue() == true) {
71 // enqueue() should return false since
72 // ref is already enqueued by the GC
73 throw new RuntimeException("Error: enqueue() returned true;"
74 + " expected false");
75 }
76
77 if (queue.poll() == null) {
78 // poll() should return ref enqueued by the GC
79 throw new RuntimeException("Error: poll() returned null;"
80 + " expected ref object");
81 }
82 }
83 }
84
85 static class ExplicitEnqueue {
86 final ReferenceQueue<Object> queue = new ReferenceQueue<>();
87 final List<Reference<Object>> refs = new ArrayList<>();
88 final int iterations = 1000;
89
90 ExplicitEnqueue() {
91 this.refs.add(new SoftReference<>(new Object(), queue));
92 this.refs.add(new WeakReference<>(new Object(), queue));
93 // Can't test PhantomReference because get() always returns null.
94 }
95
96 void run() throws InterruptedException {
97 for (Reference<Object> ref : refs) {
98 if (ref.enqueue() == false) {
99 throw new RuntimeException("Error: enqueue failed");
100 }
101 if (ref.get() != null) {
102 throw new RuntimeException("Error: referent must be cleared");
103 }
104 }
105
106 System.gc();
107 for (int i = 0; refs.size() > 0 && i < iterations; i++) {
108 Reference<Object> ref = (Reference<Object>)queue.poll();
109 if (ref == null) {
110 System.gc();
111 Thread.sleep(100);
112 continue;
113 }
114
115 if (refs.remove(ref) == false) {
116 throw new RuntimeException("Error: unknown reference " + ref);
117 }
118 }
119
120 if (!refs.isEmpty()) {
121 throw new RuntimeException("Error: not all references are removed");
|