Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: test/runtime/ClassUnload/KeepAliveSoftReference.java
test/runtime/ClassUnload/KeepAliveSoftReference.java
- changeset 0
- f90c822e73f8
equal
deleted
inserted
replaced
| -1:000000000000 | 0:f90c822e73f8 |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2013, 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 KeepAliveSoftReference | |
| 26 * @summary This test case uses a java.lang.ref.SoftReference referencing a class instance to keep a class alive. | |
| 27 * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary | |
| 28 * @library classes | |
| 29 * @build KeepAliveSoftReference test.Empty | |
| 30 * @build ClassUnloadCommon | |
| 31 * @run main ClassFileInstaller sun.hotspot.WhiteBox | |
| 32 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveSoftReference | |
| 33 */ | |
| 34 | |
| 35 import java.lang.ref.SoftReference; | |
| 36 import sun.hotspot.WhiteBox; | |
| 37 | |
| 38 /** | |
| 39 * Test that verifies that classes are not unloaded when specific types of references are kept to them. | |
| 40 */ | |
| 41 public class KeepAliveSoftReference { | |
| 42 private static final String className = "test.Empty"; | |
| 43 private static final WhiteBox wb = WhiteBox.getWhiteBox(); | |
| 44 | |
| 45 public static void main(String... args) throws Exception { | |
| 46 ClassLoader cl = ClassUnloadCommon.newClassLoader(); | |
| 47 Class<?> c = cl.loadClass(className); | |
| 48 Object o = c.newInstance(); | |
| 49 SoftReference<Object> sr = new SoftReference(o); | |
| 50 o = null; c = null; cl = null; | |
| 51 | |
| 52 { | |
| 53 boolean isAlive = wb.isClassAlive(className); | |
| 54 System.out.println("testSoftReference (1) alive: " + isAlive); | |
| 55 boolean cleared = (sr.get() == null); | |
| 56 boolean shouldBeAlive = !cleared; | |
| 57 ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); | |
| 58 } | |
| 59 | |
| 60 ClassUnloadCommon.triggerUnloading(); | |
| 61 | |
| 62 { | |
| 63 boolean isAlive = wb.isClassAlive(className); | |
| 64 System.out.println("testSoftReference (2) alive: " + isAlive); | |
| 65 boolean cleared = (sr.get() == null); | |
| 66 boolean shouldBeAlive = !cleared; | |
| 67 ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); | |
| 68 } | |
| 69 sr.clear(); | |
| 70 ClassUnloadCommon.triggerUnloading(); | |
| 71 | |
| 72 { | |
| 73 boolean isAlive = wb.isClassAlive(className); | |
| 74 System.out.println("testSoftReference (3) alive: " + isAlive); | |
| 75 boolean cleared = (sr.get() == null); | |
| 76 boolean shouldBeAlive = !cleared; | |
| 77 ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); | |
| 78 } | |
| 79 } | |
| 80 } |
