jdk-24/jdk/test/java/lang/invoke/LFCaching/LFMultiThreadCachingTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test LFMultiThreadCachingTest
 * @bug 8046703
 * @summary Test verifies that lambda forms are cached when run with multiple threads
 * @author kshefov
 * @library /lib/testlibrary/jsr292 /lib/testlibrary
 * @build TestMethods
 * @build LambdaFormTestCase
 * @build LFCachingTestCase
 * @build LFMultiThreadCachingTest
 * @run main/othervm/timeout=300 -Djava.lang.invoke.MethodHandle.USE_LF_EDITOR=true LFMultiThreadCachingTest
 */

import java.lang.invoke.MethodHandle;
import java.util.EnumSet;
import java.util.Map;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;

/**
 * Multiple threaded lambda forms caching test class.
 */
public final class LFMultiThreadCachingTest extends LFCachingTestCase {
    private static final TestMethods.Kind[] KINDS;
    static {
        EnumSet<TestMethods.Kind> set = EnumSet.complementOf(EnumSet.of(TestMethods.Kind.EXCEPT));
        KINDS = set.toArray(new TestMethods.Kind[set.size()]);
        if (KINDS.length < 2) {
            throw new Error("TESTBUG: KINDS.length[" + KINDS.length + "] should be at least 2");
        }
    }
    private static final int CORES = Math.max(KINDS.length, Runtime.getRuntime().availableProcessors());

    /**
     * Constructor a for multiple threaded lambda forms caching test case.
     *
     * @param testMethod A method from {@code j.l.i.MethodHandles} class that
     * returns a {@code j.l.i.MethodHandle} instance.
     */
    public LFMultiThreadCachingTest(TestMethods testMethod) {
        super(testMethod);
    }

    @Override
    public void doTest() {
        Map<String, Object> data = getTestMethod().getTestCaseData();
        ConcurrentLinkedQueue<MethodHandle> adapters = new ConcurrentLinkedQueue<>();
        CyclicBarrier begin = new CyclicBarrier(CORES);
        CountDownLatch end = new CountDownLatch(CORES);
        for (int i = 0; i < CORES; ++i) {
            TestMethods.Kind kind = KINDS[i % KINDS.length];
            new Thread(() -> {
                try {
                    begin.await();
                    adapters.add(getTestMethod().getTestCaseMH(data, kind));
                } catch (InterruptedException | BrokenBarrierException | IllegalAccessException | NoSuchMethodException ex) {
                    throw new Error("Unexpected exception: ", ex);
                } finally {
                    end.countDown();
                }
            }).start();
        }
        try {
            end.await();
        } catch (InterruptedException ex) {
            throw new Error("Unexpected exception: ", ex);
        }
        if (adapters.size() < CORES) {
            throw new Error("adapters size[" + adapters.size() + "] is less than " + CORES);
        }
        MethodHandle prev = adapters.poll();
        for (MethodHandle current : adapters) {
            checkLFCaching(prev, current);
            prev = current;
        }
    }

    /**
     * Main routine for multiple threaded lambda forms caching test.
     *
     * @param args Accepts no arguments.
     */
    public static void main(String[] args) {
        LambdaFormTestCase.runTests(LFMultiThreadCachingTest::new, EnumSet.allOf(TestMethods.class));
    }
}