/*

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 * 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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import jdk.test.lib.Asserts;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

/*

 * @test TestMetaspaceSizeFlags

 * @key gc

 * @bug 8024650

 * @summary Test that metaspace size flags can be set correctly

 * @library /test/lib

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

 *          java.management

 */

public class TestMetaspaceSizeFlags {

  public static final long K = 1024L;

  public static final long M = 1024L * K;

  // HotSpot uses a number of different values to align memory size flags.

  // This is currently the largest alignment (unless huge large pages are used).

  public static final long MAX_ALIGNMENT = 32 * M;

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

    testMaxMetaspaceSizeEQMetaspaceSize(MAX_ALIGNMENT, MAX_ALIGNMENT);

    // 8024650: MaxMetaspaceSize was adjusted instead of MetaspaceSize.

    testMaxMetaspaceSizeLTMetaspaceSize(MAX_ALIGNMENT, MAX_ALIGNMENT * 2);

    testMaxMetaspaceSizeGTMetaspaceSize(MAX_ALIGNMENT * 2, MAX_ALIGNMENT);

  }

  private static void testMaxMetaspaceSizeEQMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {

    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);

    Asserts.assertEQ(maxMetaspaceSize, metaspaceSize);

    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);

    Asserts.assertEQ(mf.metaspaceSize, metaspaceSize);

  }

  private static void testMaxMetaspaceSizeLTMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {

    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);

    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);

    Asserts.assertEQ(mf.metaspaceSize, maxMetaspaceSize);

  }

  private static void testMaxMetaspaceSizeGTMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {

    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);

    Asserts.assertGT(maxMetaspaceSize, metaspaceSize);

    Asserts.assertGT(mf.maxMetaspaceSize, mf.metaspaceSize);

    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);

    Asserts.assertEQ(mf.metaspaceSize, metaspaceSize);

  }

  private static MetaspaceFlags runAndGetValue(long maxMetaspaceSize, long metaspaceSize) throws Exception {

    OutputAnalyzer output = run(maxMetaspaceSize, metaspaceSize);

    output.shouldNotMatch("Error occurred during initialization of VM\n.*");

    String stringMaxMetaspaceSize = output.firstMatch(".* MaxMetaspaceSize .* = (\\d+).*", 1);

    String stringMetaspaceSize = output.firstMatch(".* MetaspaceSize .* = (\\d+).*", 1);

    return new MetaspaceFlags(Long.parseLong(stringMaxMetaspaceSize),

                              Long.parseLong(stringMetaspaceSize));

  }

  private static OutputAnalyzer run(long maxMetaspaceSize, long metaspaceSize) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

        "-XX:MaxMetaspaceSize=" + maxMetaspaceSize,

        "-XX:MetaspaceSize=" + metaspaceSize,

        "-XX:-UseLargePages", // Prevent us from using 2GB large pages on solaris + sparc.

        "-XX:+PrintFlagsFinal",

        "-version");

    return new OutputAnalyzer(pb.start());

  }

  private static class MetaspaceFlags {

    public long maxMetaspaceSize;

    public long metaspaceSize;

    public MetaspaceFlags(long maxMetaspaceSize, long metaspaceSize) {

      this.maxMetaspaceSize = maxMetaspaceSize;

      this.metaspaceSize = metaspaceSize;

    }

  }

}