test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorTest.java

/*
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 * 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.
 *
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 */

package MyPackage;

import java.util.List;

/**
 * @test
 * @summary Verifies the JVMTI Heap Monitor API
 * @build Frame HeapMonitor
 * @compile HeapMonitorTest.java
 * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorTest
 */

public class HeapMonitorTest {

  private static native boolean framesAreNotLive(Frame[] frames);

  public static void main(String[] args) {
    if (args.length > 0) {
      // For interpreter mode, have a means to reduce the default iteration count.
      HeapMonitor.setAllocationIterations(Integer.parseInt(args[0]));
    }

    // Put sampling rate to 100k to ensure samples are collected.
    HeapMonitor.setSamplingInterval(100 * 1024);

    if (!HeapMonitor.eventStorageIsEmpty()) {
      throw new RuntimeException("Storage is not empty at test start...");
    }

    HeapMonitor.enableSamplingEvents();
    List<Frame> frameList = HeapMonitor.allocate();
    frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorTest.java", 54));

    Frame[] frames = frameList.toArray(new Frame[0]);
    if (!HeapMonitor.obtainedEvents(frames)
        && !HeapMonitor.garbageContains(frames)) {
      throw new RuntimeException("Events not found with the right frames.");
    }

    HeapMonitor.disableSamplingEvents();
    HeapMonitor.resetEventStorage();
    if (!HeapMonitor.eventStorageIsEmpty()) {
      throw new RuntimeException("Storage is not empty after reset.");
    }

    HeapMonitor.allocate();
    if (!HeapMonitor.eventStorageIsEmpty()) {
      throw new RuntimeException("Storage is not empty after allocation while disabled.");
    }
  }
}