Mercurial > hg > graal-compiler
view test/runtime/ClassUnload/KeepAliveSoftReference.java @ 10904:4b8aa6386c12
removed redundant implements clause for Lowerable
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Mon, 29 Jul 2013 12:07:08 +0200 |
parents | 33bcd9ead1d5 |
children |
line wrap: on
line source
/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test KeepAliveSoftReference * @summary This test case uses a java.lang.ref.SoftReference referencing a class instance to keep a class alive. * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary * @library classes * @build KeepAliveSoftReference test.Empty * @build ClassUnloadCommon * @run main ClassFileInstaller sun.hotspot.WhiteBox * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveSoftReference */ import java.lang.ref.SoftReference; import sun.hotspot.WhiteBox; /** * Test that verifies that classes are not unloaded when specific types of references are kept to them. */ public class KeepAliveSoftReference { private static final String className = "test.Empty"; private static final WhiteBox wb = WhiteBox.getWhiteBox(); public static void main(String... args) throws Exception { ClassLoader cl = ClassUnloadCommon.newClassLoader(); Class<?> c = cl.loadClass(className); Object o = c.newInstance(); SoftReference<Object> sr = new SoftReference(o); o = null; c = null; cl = null; { boolean isAlive = wb.isClassAlive(className); System.out.println("testSoftReference (1) alive: " + isAlive); boolean cleared = (sr.get() == null); boolean shouldBeAlive = !cleared; ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); } ClassUnloadCommon.triggerUnloading(); { boolean isAlive = wb.isClassAlive(className); System.out.println("testSoftReference (2) alive: " + isAlive); boolean cleared = (sr.get() == null); boolean shouldBeAlive = !cleared; ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); } sr.clear(); ClassUnloadCommon.triggerUnloading(); { boolean isAlive = wb.isClassAlive(className); System.out.println("testSoftReference (3) alive: " + isAlive); boolean cleared = (sr.get() == null); boolean shouldBeAlive = !cleared; ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive); } } }