test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java

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/*
 * @test TestParallelRefProc
 * @key gc
 * @summary Test defaults processing for -XX:+ParallelRefProcEnabled.
 * @library /test/lib
 * @run driver TestParallelRefProc
 */

import java.util.Arrays;
import java.util.ArrayList;

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

public class TestParallelRefProc {

    public static void main(String args[]) throws Exception {
        testFlag(new String[] { "-XX:+UseSerialGC" }, false);
        testFlag(new String[] { "-XX:+UseConcMarkSweepGC" }, false);
        testFlag(new String[] { "-XX:+UseParallelGC" }, false);
        testFlag(new String[] { "-XX:+UseG1GC", "-XX:ParallelGCThreads=1" }, false);
        testFlag(new String[] { "-XX:+UseG1GC", "-XX:ParallelGCThreads=2" }, true);
        testFlag(new String[] { "-XX:+UseG1GC", "-XX:-ParallelRefProcEnabled", "-XX:ParallelGCThreads=2" }, false);
    }

    private static final String parallelRefProcEnabledPattern =
        " *bool +ParallelRefProcEnabled *= *true +\\{product\\}";

    private static final String parallelRefProcDisabledPattern =
        " *bool +ParallelRefProcEnabled *= *false +\\{product\\}";

    private static void testFlag(String[] args, boolean expectedTrue) throws Exception {
        ArrayList<String> result = new ArrayList<String>();
        result.addAll(Arrays.asList(args));
        result.add("-XX:+PrintFlagsFinal");
        result.add("-version");
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(result.toArray(new String[0]));

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

        output.shouldHaveExitValue(0);

        final String expectedPattern = expectedTrue ? parallelRefProcEnabledPattern : parallelRefProcDisabledPattern;

        String value = output.firstMatch(expectedPattern);
        if (value == null) {
            throw new RuntimeException(
                Arrays.toString(args) + " didn't set ParallelRefProcEnabled to " + expectedTrue + " as expected");
        }
    }
}