test/jdk/java/lang/Thread/ThreadSleepEventThrows.java

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/**
 * @test
 * @summary Test Thread.sleep when emitting the JFR jdk.ThreadSleep event throws OOME
 * @modules java.base/jdk.internal.event
 * @compile/module=java.base jdk/internal/event/ThreadSleepEvent.java
 * @run junit ThreadSleepEventThrows
 */

import jdk.internal.event.ThreadSleepEvent;
import static java.util.concurrent.TimeUnit.NANOSECONDS;

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

class ThreadSleepEventThrows {

    /**
     * Test Thread.sleep when creating the ThreadSleepEvent fails with OOME.
     */
    @Test
    void testThreadSleepEventCreateThrows() throws Exception {
        ThreadSleepEvent.setCreateThrows(true);
        try {
            testSleep();
        } finally {
            ThreadSleepEvent.setCreateThrows(false);
        }
    }

    /**
     * Test Thread.sleep when ThreadSleepEvent.begin fails with OOME.
     */
    @Test
    void testThreadSleepEventBeginThrows() throws Exception {
        ThreadSleepEvent.setBeginThrows(true);
        try {
            testSleep();
        } finally {
            ThreadSleepEvent.setBeginThrows(false);
        }
    }

    /**
     * Test Thread.sleep when ThreadSleepEvent.commit fails with OOME.
     */
    @Test
    void testThreadSleepEventCommitThrows() throws Exception {
        ThreadSleepEvent.setCommitThrows(true);
        try {
            testSleep();
        } finally {
            ThreadSleepEvent.setCommitThrows(false);
        }
    }

    /**
     * Test Thread.sleep takes a minimum duration and doesn't throw.
     */
    private void testSleep() throws Exception {
        long start = currentTimeMillis();
        Thread.sleep(SLEEP_TIME);
        long duration = currentTimeMillis() - start;
        assertTrue(duration >= MIN_EXPECTED_DURATION,
            "Duration " + duration + "ms, expected >= " + MIN_EXPECTED_DURATION + "ms");
    }

    private static final int SLEEP_TIME = 2000;
    private static final int MIN_EXPECTED_DURATION = 1900;

    private static long currentTimeMillis() {
        return NANOSECONDS.toMillis(System.nanoTime());
    }
}