/*

 * Copyright (c) 2014, 2016, 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.

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 */

/*

 * @test TestGCId

 * @bug 8043607

 * @summary Ensure that the GCId is logged

 * @requires vm.gc=="null"

 * @key gc

 * @library /testlibrary

 * @modules java.base/jdk.internal.misc

 *          java.management

 */

import jdk.test.lib.ProcessTools;

import jdk.test.lib.OutputAnalyzer;

public class TestGCId {

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

    testGCId("UseParallelGC");

    testGCId("UseG1GC");

    testGCId("UseConcMarkSweepGC");

    testGCId("UseSerialGC");

  }

  private static void verifyContainsGCIDs(OutputAnalyzer output) {

    output.shouldMatch("\\[.*\\]\\[.*\\]\\[.*\\] GC\\(0\\) ");

    output.shouldMatch("\\[.*\\]\\[.*\\]\\[.*\\] GC\\(1\\) ");

    output.shouldHaveExitValue(0);

  }

  private static void testGCId(String gcFlag) throws Exception {

    ProcessBuilder pb_default =

      ProcessTools.createJavaProcessBuilder("-XX:+" + gcFlag, "-Xlog:gc", "-Xmx10M", GCTest.class.getName());

    verifyContainsGCIDs(new OutputAnalyzer(pb_default.start()));

  }

  static class GCTest {

    private static byte[] garbage;

    public static void main(String [] args) {

      System.out.println("Creating garbage");

      // create 128MB of garbage. This should result in at least one GC

      for (int i = 0; i < 1024; i++) {

        garbage = new byte[128 * 1024];

      }

      // do a system gc to get one more gc

      System.gc();

      System.out.println("Done");

    }

  }

}