| /* |
| * Copyright (c) 2015, 2016, 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 TestDisableExplicitGC |
| * @requires vm.opt.DisableExplicitGC == null |
| * @summary Verify GC behavior with DisableExplicitGC flag. |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * @modules jdk.management/com.sun.management.internal |
| * @run main/othervm -Xlog:gc=debug TestDisableExplicitGC |
| * @run main/othervm/fail -XX:+DisableExplicitGC -Xlog:gc=debug TestDisableExplicitGC |
| * @run main/othervm -XX:-DisableExplicitGC -Xlog:gc=debug TestDisableExplicitGC |
| */ |
| import java.lang.management.GarbageCollectorMXBean; |
| import java.util.List; |
| import static jdk.test.lib.Asserts.*; |
| |
| public class TestDisableExplicitGC { |
| |
| public static void main(String[] args) throws InterruptedException { |
| List<GarbageCollectorMXBean> list = java.lang.management.ManagementFactory.getGarbageCollectorMXBeans(); |
| long collectionCountBefore = getCollectionCount(list); |
| System.gc(); |
| long collectionCountAfter = getCollectionCount(list); |
| assertLT(collectionCountBefore, collectionCountAfter); |
| } |
| |
| private static long getCollectionCount(List<GarbageCollectorMXBean> list) { |
| int collectionCount = 0; |
| for (GarbageCollectorMXBean gcMXBean : list) { |
| collectionCount += gcMXBean.getCollectionCount(); |
| } |
| return collectionCount; |
| } |
| } |