/*
 * 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
 * @summary Verifies if cached and live are the same right after a GC.
 * @build Frame HeapMonitor
 * @compile HeapMonitorCachedTest.java
 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorCachedTest
 */

public class HeapMonitorCachedTest {

  private static native boolean cachedAndLiveAreSame();
  private static native void getLiveTracesToForceGc();
  private static native long getCachedHashCode();

  public static void main(String[] args) {
    HeapMonitor.enableSampling();
    List<Frame> frameList = HeapMonitor.allocate();
    frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorCachedTest.java", 44));
    Frame[] frames = frameList.toArray(new Frame[0]);

    // Check that the data is available while heap sampling is enabled.
    boolean status = HeapMonitor.framesExistEverywhere(frames);
    if (!status) {
      throw new RuntimeException("Failed to find the traces before the wipe out.");
    }

    // Check cached & live are the same after a GC.
    getLiveTracesToForceGc();
    status = cachedAndLiveAreSame();
    if (!status) {
      throw new RuntimeException("Cached frames and live frames are not the same.");
    }

    // Allocate some more and then free it all, the cache hash code should remain the same.
    long cacheHashCode = getCachedHashCode();
    HeapMonitor.allocate();
    // Free the memory entirely.
    HeapMonitor.freeStorage();
    long secondCacheHashCode = getCachedHashCode();

    if (cacheHashCode != secondCacheHashCode) {
      throw new RuntimeException("Cached hash code changed.");
    }

    // Check cached & live are not the same: cached will still have the old items and live, by
    // provoking a GC, will have nothing left.
    status = cachedAndLiveAreSame();
    if (status) {
      throw new RuntimeException("Cached frames and live frames are still the same.");
    }

    // Disabling the sampling should wipe everything out.
    HeapMonitor.disableSampling();
  }
}