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/*

 * @test TestSelectDefaultGC

 * @summary Test selection of GC when no GC option is specified

 * @bug 8068582

 * @key gc

 * @library /testlibrary

 *          java.management

 * @ignore 8148239

 * @run driver TestSelectDefaultGC

 */

import jdk.test.lib.*;

import java.util.regex.*;

public class TestSelectDefaultGC {

    public static void assertVMOption(OutputAnalyzer output, String option, boolean value) {

        output.shouldMatch(" " + option + " .*=.* " + value + " ");

    }

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

        // Start VM without specifying GC

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintFlagsFinal", "-version");

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

        output.shouldHaveExitValue(0);

        boolean isServerVM = Platform.isServer();

        boolean isEmbeddedVM = Platform.isEmbedded();

        // Verify GC selection

        // G1 is default for non-embedded server VMs

        assertVMOption(output, "UseG1GC",            isServerVM && !isEmbeddedVM);

        // Parallel is default for embedded server VMs

        assertVMOption(output, "UseParallelGC",      isServerVM && isEmbeddedVM);

        assertVMOption(output, "UseParallelOldGC",   isServerVM && isEmbeddedVM);

        // Serial is default for non-server VMs

        assertVMOption(output, "UseSerialGC",        !isServerVM);

        assertVMOption(output, "UseConcMarkSweepGC", false);

        assertVMOption(output, "UseParNewGC",        false);

    }

}