1 /* 2 * Copyright (c) 2018, Google 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 package MyPackage; 25 26 import java.util.List; 27 28 /** 29 * @test 30 * @summary Verifies if turning off the event notification stops events. 31 * @build Frame HeapMonitor 32 * @compile HeapMonitorEventOnOffTest.java 33 * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorEventOnOffTest 34 */ 35 public class HeapMonitorEventOnOffTest { 36 private static void checkNoEventsAreBeingSent() { 37 HeapMonitor.resetEventStorage(); 38 HeapMonitor.repeatAllocate(10); 39 40 // Check that the data is available while heap sampling is enabled. 41 boolean status = HeapMonitor.eventStorageIsEmpty(); 42 if (!status) { 43 throw new RuntimeException("Failed to find the traces before the wipe out."); 44 } 45 } 46 47 private static void checkEventsAreBeingSent() { 48 List<Frame> frameList = HeapMonitor.repeatAllocate(10); 49 50 frameList.add(new Frame("checkEventsAreBeingSent", "()V", "HeapMonitorEventOnOffTest.java", 48)); 51 Frame[] frames = frameList.toArray(new Frame[0]); 52 53 // Check that the data is available while heap sampling is enabled. 54 boolean status = HeapMonitor.obtainedEvents(frames); 55 if (!status) { 56 throw new RuntimeException("Failed to find the traces before the wipe out."); 57 } 58 } 59 60 public static void main(String[] args) { 61 HeapMonitor.enableSamplingEvents(); 62 checkEventsAreBeingSent(); 63 64 // Disabling the notification system should stop events. 65 HeapMonitor.disableSamplingEvents(); 66 checkNoEventsAreBeingSent(); 67 68 // Enabling the notification system should start events again. 69 HeapMonitor.enableSamplingEvents(); 70 checkEventsAreBeingSent(); 71 } 72 }