TestPeriodicLogMessages.java

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package gc.g1;

/**
 * @test TestPeriodicLogMessages
 * @bug 8216490
 * @requires vm.gc.G1
 * @summary Verify that log messages are printed as expected
 * @library /test/lib /
 * @modules java.base/jdk.internal.misc
 * @modules java.management/sun.management
 * @run driver gc.g1.TestPeriodicLogMessages
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class TestPeriodicLogMessages {

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
                                                                  "-XX:G1PeriodicGCInterval=0",
                                                                  "-Xlog:gc+init,gc+periodic=debug",
                                                                  "-Xmx10M",
                                                                  GCTest.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("Periodic GC: Disabled");
        output.shouldNotContain("Checking for periodic GC");
        output.shouldHaveExitValue(0);

        pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
                                                   "-XX:G1PeriodicGCInterval=100",
                                                   "-Xlog:gc+init,gc+periodic=debug",
                                                   "-Xmx10M",
                                                   GCTest.class.getName());

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Periodic GC: Enabled");
        output.shouldContain("Periodic GC Interval: 100ms");
        output.shouldContain("Checking for periodic GC");
        output.shouldHaveExitValue(0);
    }

    static class GCTest {
        public static void main(String [] args) throws Exception {
            System.out.println("Waiting for messages...");
            Thread.sleep(1000);
            System.out.println("Done");
        }
    }
}