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 /**
  27  * @test
  28  * @build Frame HeapMonitor
  29  * @summary Verifies the JVMTI Heap Monitor Statistics
  30  * @compile HeapMonitorStatSimpleTest.java
  31  * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorStatSimpleTest
  32  */
  33 
  34 public class HeapMonitorStatSimpleTest {
  35   private native static int areSamplingStatisticsZero();
  36 
  37   public static void main(String[] args) {
  38     if (!HeapMonitor.eventStorageIsEmpty()) {
  39       throw new RuntimeException("Statistics should be null to begin with.");
  40     }
  41 
  42     HeapMonitor.enableSamplingRate();
  43     HeapMonitor.allocate();
  44 
  45     if (HeapMonitor.eventStorageIsEmpty()) {
  46       throw new RuntimeException("Statistics should not be null now.");
  47     }
  48   }
  49 }