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/*

 * @test TestWBGC

 * @bug 8055098

 * @summary Test verify that WB methods isObjectInOldGen and youngGC works correctly.

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 * @run driver TestWBGC

 */

import jdk.test.lib.Asserts;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import sun.hotspot.WhiteBox;

public class TestWBGC {

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

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

                true,

                "-Xbootclasspath/a:.",

                "-XX:+UnlockDiagnosticVMOptions",

                "-XX:+WhiteBoxAPI",

                "-XX:MaxTenuringThreshold=1",

                "-Xlog:gc",

                GCYoungTest.class.getName());

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

        System.out.println(output.getStdout());

        output.shouldHaveExitValue(0);

        output.shouldContain("WhiteBox Initiated Young GC");

        output.shouldNotContain("Full");

        // To be sure that we don't provoke Full GC additionaly to young

    }

    public static class GCYoungTest {

        static WhiteBox wb = WhiteBox.getWhiteBox();

        public static Object obj;

        public static void main(String args[]) {

            obj = new Object();

            Asserts.assertFalse(wb.isObjectInOldGen(obj));

            wb.youngGC();

            wb.youngGC();

            // 2 young GC is needed to promote object into OldGen

            Asserts.assertTrue(wb.isObjectInOldGen(obj));

        }

    }

}