/*

 * Copyright (c) 2018, Google and/or its affiliates. All rights reserved.

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package MyPackage;

import java.util.ArrayList;

import java.util.List;

// Graal is not tested here due to Graal not supporting DisableIntrinsic.

/**

 * @test

 * @summary Verifies that when the VM event is sent, sampled events are also collected.

 * @build Frame HeapMonitor

 * @compile HeapMonitorVMEventsTest.java

 * @requires !vm.graal.enabled

 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions

 *                          -XX:DisableIntrinsic=_clone

 *                          -agentlib:HeapMonitorTest MyPackage.HeapMonitorVMEventsTest

 */

public class HeapMonitorVMEventsTest implements Cloneable {

  private static native int vmEvents();

  private static final int ITERATIONS = 1 << 15;

  private static final Object[] array = new Object[ITERATIONS];

  private static void cloneObjects(int iterations) {

    HeapMonitorVMEventsTest object = new HeapMonitorVMEventsTest();

    for (int i = 0; i < iterations; i++) {

      try {

        array[i] = object.clone();

      } catch (Exception e) {

        throw new RuntimeException(e);

      }

    }

  }

  public Object clone() throws CloneNotSupportedException {

    return super.clone();

  }

  private static void checkDifference(int first, int second) {

    double diff = Math.abs(first - second) * 100;

    diff /= first;

    // case other items are getting allocated during the test.

    if (diff > 10) {

          + ": " + first + " , " + second);

    }

  }

  private static void compareSampledAndVM() {

    HeapMonitor.resetEventStorage();

    cloneObjects(ITERATIONS);

    int onlySampleCount = HeapMonitor.sampledEvents();

    HeapMonitor.enableVMEvents();

    HeapMonitor.resetEventStorage();

    if (!HeapMonitor.eventStorageIsEmpty()) {

      throw new RuntimeException("Storage is not empty after reset.");

    }

    cloneObjects(ITERATIONS);

    int sampleCount = HeapMonitor.sampledEvents();

    int vmCount = vmEvents();

    System.err.println("Obtained: " + onlySampleCount + " - " + sampleCount + " - "  + vmCount);

    checkDifference(onlySampleCount, sampleCount);

    checkDifference(onlySampleCount, vmCount);

  }

  public static void main(String[] args) {

    if (!HeapMonitor.eventStorageIsEmpty()) {

      throw new RuntimeException("Storage is not empty at test start...");

    }

    HeapMonitor.sampleEverything();

    compareSampledAndVM();

  }

}