/*

 * 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.List;

/**

 * @test

 * @build Frame HeapMonitor

 * @summary Verifies the default GC with the Heap Monitor event system.

 * @compile HeapMonitorGCTest.java

 * @requires vm.gc == "G1" | vm.gc == "null"

 * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorGCTest

 */

/**

 * This test is checking that various GCs work as intended: events are sent, forcing GC works, etc.

 */

public class HeapMonitorGCTest {

  public static void main(String[] args) {

    if (!HeapMonitor.eventStorageIsEmpty()) {

      throw new RuntimeException("Statistics should be null to begin with.");

    }

    HeapMonitor.enableSamplingEvents();

    List<Frame> frameList = HeapMonitor.allocate();

    Frame[] frames = frameList.toArray(new Frame[0]);

      throw new RuntimeException("No expected events were found.");

    }

    HeapMonitor.forceGarbageCollection();

    if (!HeapMonitor.garbageContains(frames)) {

      throw new RuntimeException("Forcing GC did not work, not a single object was collected.");

    }

  }

}