UnorderedThreadPoolEventExecutorTest Class — netty Architecture

Source Code

common/src/test/java/io/netty/util/concurrent/UnorderedThreadPoolEventExecutorTest.java lines 30–141

public class UnorderedThreadPoolEventExecutorTest {

    // See https://github.com/netty/netty/issues/6507
    @Test
    public void testNotEndlessExecute() throws Exception {
        UnorderedThreadPoolEventExecutor executor = new UnorderedThreadPoolEventExecutor(1);

        try {
            // Having the first task wait on an exchanger allow us to make sure that the lister on the second task
            // is not added *after* the promise completes. We need to do this to prevent a race where the second task
            // and listener are completed before the DefaultPromise.NotifyListeners task get to run, which means our
            // queue inspection might observe this task after the CountDownLatch opens.
            final Exchanger<Void> exchanger = new Exchanger<Void>();
            final CountDownLatch latch = new CountDownLatch(3);
            Runnable task = new Runnable() {
                @Override
                public void run() {
                    try {
                        exchanger.exchange(null);
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                    latch.countDown();
                }
            };
            executor.execute(task);
            Future<?> future = executor.submit(new Runnable() {
                @Override
                public void run() {
                    latch.countDown();
                }
            }).addListener((FutureListener<Object>) f -> latch.countDown());
            exchanger.exchange(null);
            latch.await();
            future.syncUninterruptibly();

            // Now just check if the queue stays empty multiple times. This is needed as the submit to execute(...)
            // by DefaultPromise may happen in an async fashion
            for (int i = 0; i < 10000; i++) {
                assertTrue(executor.getQueue().isEmpty());
            }
        } finally {
            executor.shutdownGracefully();
        }
    }

    @Test
    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
    public void scheduledAtFixedRateMustRunTaskRepeatedly() throws InterruptedException {
        UnorderedThreadPoolEventExecutor executor = new UnorderedThreadPoolEventExecutor(1);
        final CountDownLatch latch = new CountDownLatch(3);
        Future<?> future = executor.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                latch.countDown();
            }
        }, 1, 1, TimeUnit.MILLISECONDS);
        try {
            latch.await();
        } finally {
            future.cancel(true);
            executor.shutdownGracefully();
        }
    }

    @Test
    public void testGetReturnsCorrectValueOnSuccess() throws Exception {
        UnorderedThreadPoolEventExecutor executor = new UnorderedThreadPoolEventExecutor(1);
        try {
            final String expected = "expected";
            Future<String> f = executor.submit(new Callable<String>() {
                @Override
                public String call() {
                    return expected;
                }
            });

            assertEquals(expected, f.get());
        } finally {
            executor.shutdownGracefully();
        }