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 off 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 
  43     // Check that the data is available while heap sampling is enabled.
  44     boolean status = HeapMonitor.framesExistEverywhere(frames);
  45     if (!status) {
  46       throw new RuntimeException("Failed to find the traces before the wipe out.");
  47     }
  48 
  49     // Disabling the sampling should wipe everything out.
  50     HeapMonitor.disableSampling();
  51 
  52     status = HeapMonitor.framesExistNowhere(frames);
  53     if (!status) {
  54       throw new RuntimeException("Failed to wipe out the information.");
  55     }
  56   }
  57 }