/*
 * Copyright (c) 2017, 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.
 *
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 */

package MyPackage;

import java.util.List;

/**
 * @test
 * @summary Checks the Recent garbage storage system.
 * @build Frame HeapMonitor
 * @compile HeapMonitorRecentTest.java
 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorRecentTest
 */

public class HeapMonitorRecentTest {

  private native static boolean framesNotInLiveOrRecent(Frame[] frames);
  private native static boolean framesExistInLiveAndRecent(Frame[] frames);

  private static List<Frame> runner(int max) {
    List<Frame> frameList = null;
    for (int j = 0; j < max; j++) {
      frameList = HeapMonitor.allocate();
    }
    frameList.add(new Frame("runner", "(I)Ljava/util/List;", "HeapMonitorRecentTest.java", 44));
    return frameList;
  }

  public static void main(String[] args) {
    HeapMonitor.enableSampling();
    // We are testing for the recent garbage sampler:
    // First run for 10000 iterations to fill up the garbage sampler.
    List<Frame> firstFrameList = runner(10);
    firstFrameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorRecentTest.java", 54));

    // Now because we are in a different stack frame line here, we can just re-use the same runner.
    // Run for 3, we really should not see that many of these and most should be the first type.
    List<Frame> secondFrameList = runner(10);
    secondFrameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorRecentTest.java", 59));

    // We should no longer have the initial frames.
    boolean status = framesNotInLiveOrRecent(firstFrameList.toArray(new Frame[0]));
    if (!status) {
      throw new RuntimeException("Initial frames still internally there.");
    }

    // We should see those new frames.
    status = framesExistInLiveAndRecent(secondFrameList.toArray(new Frame[0]));
    if (!status) {
      throw new RuntimeException("Second frame list not found in both live and recent.");
    }
  }
}