/*
 * Copyright (c) 2015, 2024, 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.
 */

package gc.ergonomics;

/*
 * @test TestInitialGCThreadLogging
 * @bug 8157240
 * @summary Check trace logging of initial GC threads.
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @build jdk.test.whitebox.WhiteBox
 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.ergonomics.TestInitialGCThreadLogging
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jtreg.SkippedException;
import jdk.test.whitebox.gc.GC;

public class TestInitialGCThreadLogging {
  public static void main(String[] args) throws Exception {
    boolean noneGCSupported = true;

    if (GC.G1.isSupported()) {
      noneGCSupported = false;
      testInitialGCThreadLogging("UseG1GC", "GC Thread");
    }

    if (GC.Parallel.isSupported()) {
      noneGCSupported = false;
      testInitialGCThreadLogging("UseParallelGC", "GC Thread");
    }

    if (GC.Shenandoah.isSupported()) {
      noneGCSupported = false;
      testInitialGCThreadLogging("UseShenandoahGC", "ShenWorker");
    }

    if (noneGCSupported) {
      throw new SkippedException("Skipping test because none of G1/Parallel/Shenandoah is supported.");
    }
  }

  private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output, String threadName) {
    output.shouldHaveExitValue(0); // test should run succesfully
    output.shouldContain(threadName);
  }

  private static void testInitialGCThreadLogging(String gcFlag, String threadName) throws Exception {
    // Base test with gc and +UseDynamicNumberOfGCThreads:
    OutputAnalyzer output = ProcessTools.executeLimitedTestJava(
        "-XX:+UnlockExperimentalVMOptions",
        "-XX:+" + gcFlag,
        "-Xmx10M",
        "-XX:+UseDynamicNumberOfGCThreads",
        "-Xlog:gc+task=trace",
        "-version");
    verifyDynamicNumberOfGCThreads(output, threadName);
  }
}
