1 /* 2 * Copyright (c) 2017, 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 on/off/on the monitor wipes out the information. 31 * @build Frame HeapMonitor 32 * @compile HeapMonitorOnOffTest.java 33 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorOnOffTest 34 */ 35 36 public class HeapMonitorOnOffTest { 37 public static void main(String[] args) { 38 HeapMonitor.enableSampling(); 39 List<Frame> frameList = HeapMonitor.allocate(); 40 frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorOnOffTest.java", 39)); 41 Frame[] frames = frameList.toArray(new Frame[0]); 42 HeapMonitor.disableSampling(); 43 44 // Check that the data is still there: this allows to peruse samples after profiling. 45 boolean status = HeapMonitor.framesExistEverywhere(frames); 46 if (!status) { 47 throw new RuntimeException("Failed to find the traces before the wipe out."); 48 } 49 50 // Enabling the sampling should wipe everything out. 51 HeapMonitor.enableSampling(); 52 53 status = HeapMonitor.framesExistNowhere(frames); 54 if (!status) { 55 throw new RuntimeException("Failed to wipe out the information."); 56 } 57 } 58 }