/*

 * Copyright (c) 2014, Oracle 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.

 */

/*

 * @test

 * @key gc

 * @bug 8049831

 * @library /testlibrary /testlibrary/whitebox

 * @build TestCMSClassUnloadingEnabledHWM AllocateBeyondMetaspaceSize

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run driver TestCMSClassUnloadingEnabledHWM

 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.

 */

import com.oracle.java.testlibrary.OutputAnalyzer;

import com.oracle.java.testlibrary.ProcessTools;

import java.util.ArrayList;

import java.util.Arrays;

public class TestCMSClassUnloadingEnabledHWM {

  private static long MetaspaceSize = 32 * 1024 * 1024;

  private static long YoungGenSize  = 32 * 1024 * 1024;

  private static OutputAnalyzer run(boolean enableUnloading) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-Xbootclasspath/a:.",

      "-XX:+WhiteBoxAPI",

      "-XX:MetaspaceSize=" + MetaspaceSize,

      "-Xmn" + YoungGenSize,

      "-XX:+UseConcMarkSweepGC",

      "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",

      "-XX:+PrintHeapAtGC",

      "-XX:+PrintGCDetails",

      "AllocateBeyondMetaspaceSize",

      "" + MetaspaceSize,

      "" + YoungGenSize);

    return new OutputAnalyzer(pb.start());

  }

  public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {

    return run(true);

  }

  public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {

    return run(false);

  }

  public static void testWithoutCMSClassUnloading() throws Exception {

    // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.

    OutputAnalyzer out = runWithoutCMSClassUnloading();

    out.shouldMatch(".*Full GC.*");

    out.shouldNotMatch(".*CMS Initial Mark.*");

  }

  public static void testWithCMSClassUnloading() throws Exception {

    // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.

    OutputAnalyzer out = runWithCMSClassUnloading();

    out.shouldMatch(".*CMS Initial Mark.*");

    out.shouldNotMatch(".*Full GC.*");

  }

  public static void main(String args[]) throws Exception {

    testWithCMSClassUnloading();

    testWithoutCMSClassUnloading();

  }

}