GlobalEventExecutorTest Class — netty Architecture

Source Code

common/src/test/java/io/netty/util/concurrent/GlobalEventExecutorTest.java lines 32–177

public class GlobalEventExecutorTest {

    private static final GlobalEventExecutor e = GlobalEventExecutor.INSTANCE;

    @BeforeEach
    public void setUp() throws Exception {
        // Wait until the global executor is stopped (just in case there is a task running due to previous test cases)
        for (;;) {
            if (e.thread == null || !e.thread.isAlive()) {
                break;
            }

            Thread.sleep(50);
        }
    }

    @Test
    @Timeout(value = 5000, unit = TimeUnit.MILLISECONDS)
    public void testAutomaticStartStop() throws Exception {
        final TestRunnable task = new TestRunnable(500);
        e.execute(task);

        // Ensure the new thread has started.
        Thread thread = e.thread;
        assertNotNull(thread);
        assertTrue(thread.isAlive());

        thread.join();
        assertTrue(task.ran.get());

        // Ensure another new thread starts again.
        task.ran.set(false);
        e.execute(task);
        assertNotSame(e.thread, thread);
        thread = e.thread;

        thread.join();

        assertTrue(task.ran.get());
    }

    @Test
    @Timeout(value = 5000, unit = TimeUnit.MILLISECONDS)
    public void testScheduledTasks() throws Exception {
        TestRunnable task = new TestRunnable(0);
        ScheduledFuture<?> f = e.schedule(task, 1500, TimeUnit.MILLISECONDS);
        f.sync();
        assertTrue(task.ran.get());

        // Ensure the thread is still running.
        Thread thread = e.thread;
        assertNotNull(thread);
        assertTrue(thread.isAlive());

        thread.join();
    }

    // ensure that when a task submission causes a new thread to be created, the thread inherits the thread group of the
    // submitting thread
    @Test
    @Timeout(value = 2000, unit = TimeUnit.MILLISECONDS)
    public void testThreadGroup() throws InterruptedException {
        final ThreadGroup group = new ThreadGroup("group");
        final AtomicReference<ThreadGroup> capturedGroup = new AtomicReference<ThreadGroup>();
        final Thread thread = new Thread(group, new Runnable() {
            @Override
            public void run() {
                final Thread t = e.threadFactory.newThread(new Runnable() {
                    @Override
                    public void run() {
                    }
                });
                capturedGroup.set(t.getThreadGroup());
            }
        });
        thread.start();
        thread.join();

        assertEquals(group, capturedGroup.get());
    }