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import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.Asserts;

import sun.hotspot.WhiteBox;

/* @test TestMetaspaceCMSCancel

 * @bug 8026752

 * @summary Tests cancel of CMS concurrent cycle for Metaspace after a full GC

 * @library /test/lib

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

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 * @run main/othervm TestMetaspaceCMSCancel

 */

public class TestMetaspaceCMSCancel {

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

        // Set a small MetaspaceSize so that a CMS concurrent collection will be

        // scheduled.  Set CMSWaitDuration to 5s so that the concurrent collection

        // start may be delayed.  It does not guarantee 5s before the start of the

        // concurrent collection but does increase the probability that it will

        // be started later.  System.gc() is used to invoke a full collection.  Set

        // ExplicitGCInvokesConcurrent to off so it is a STW collection.

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:.",

                                                                  "-XX:+UnlockDiagnosticVMOptions",

                                                                  "-XX:+WhiteBoxAPI",

                                                                  "-XX:+UseConcMarkSweepGC",

                                                                  "-XX:MetaspaceSize=2m",

                                                                  "-XX:CMSWaitDuration=5000",

                                                                  "-XX:-ExplicitGCInvokesConcurrent",

                                                                  "-Xlog:gc*=debug",

                                                                  MetaspaceGCTest.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldNotContain("Concurrent Reset");

        output.shouldHaveExitValue(0);

    }

    static class MetaspaceGCTest {

        public static void main(String [] args) {

            WhiteBox wb = WhiteBox.getWhiteBox();

            System.gc();

            Asserts.assertFalse(wb.metaspaceShouldConcurrentCollect());

        }

    }

}