--- /dev/null 2015-02-21 03:54:46.679375888 +0400 +++ new/test/gc/TestDisableExplicitGC.java 2015-02-25 16:05:24.008904219 +0400 @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2015, 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. + * @run main/othervm TestDisableExplicitGC + * @run main/othervm/fail -XX:+DisableExplicitGC TestDisableExplicitGC + * @run main/othervm -XX:-DisableExplicitGC TestDisableExplicitGC + */ +import com.sun.management.GarbageCollectionNotificationInfo; +import java.lang.management.GarbageCollectorMXBean; +import java.util.List; +import javax.management.Notification; +import javax.management.NotificationEmitter; +import javax.management.NotificationListener; +import javax.management.openmbean.CompositeData; + +public class TestDisableExplicitGC { + + private static final int NOTIFICATION_DELAY = 20; + private static volatile boolean gcNotificationReceived = false; + + public static void main(String[] args) throws InterruptedException { + List list = java.lang.management.ManagementFactory.getGarbageCollectorMXBeans(); + for (GarbageCollectorMXBean gcMXBean : list) { + NotificationEmitter emitter = (NotificationEmitter) gcMXBean; + emitter.addNotificationListener(new GCNotificationListener(), null, null); + } + System.gc(); + long deadLine = System.currentTimeMillis() + NOTIFICATION_DELAY * 1000; + while (!gcNotificationReceived && System.currentTimeMillis() < deadLine) { + Thread.sleep(1000); + } + if (!gcNotificationReceived) { + throw new RuntimeException("Notification has not been received within " + NOTIFICATION_DELAY + " seconds!"); + } + } + + static class GCNotificationListener implements NotificationListener { + + @Override + public void handleNotification(Notification notification, Object handback) { + if (notification.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { + GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) notification.getUserData()); + System.out.println("GC Cause:" + info.getGcCause()); + if (info.getGcCause().equals("System.gc()")) { + gcNotificationReceived = true; + } + } + } + } +}