@Test(expected = IllegalStateException.class)
public void shouldThrowExceptionWhenAddingEventProcessorsAfterTheProducerBarrierHasBeenCreated()
throws Exception {
executor.ignoreExecutions();
disruptor.handleEventsWith(new SleepingEventHandler());
disruptor.start();
disruptor.handleEventsWith(new SleepingEventHandler());
}
@Test(expected = IllegalStateException.class)
public void shouldThrowExceptionIfStartIsCalledTwice() throws Exception {
executor.ignoreExecutions();
disruptor.handleEventsWith(new SleepingEventHandler());
disruptor.start();
disruptor.start();
}
@Test(expected = IllegalArgumentException.class)
public void shouldThrowExceptionIfHandlerUsedWithAndIsNotAlreadyConsuming() throws Exception {
final DelayedEventHandler handler1 = createDelayedEventHandler();
final DelayedEventHandler handler2 = createDelayedEventHandler();
disruptor.handleEventsWith(handler1);
disruptor.after(handler1).and(handler2);
}
@Test
public void shouldSupportHandlersAsDependenciesToCustomProcessors() throws Exception {
final DelayedEventHandler delayedEventHandler = createDelayedEventHandler();
disruptor.handleEventsWith(delayedEventHandler);
RingBuffer<TestEvent> ringBuffer = disruptor.getRingBuffer();
CountDownLatch countDownLatch = new CountDownLatch(2);
EventHandler<TestEvent> handlerWithBarrier = new EventHandlerStub(countDownLatch);
final SequenceBarrier sequenceBarrier =
disruptor.after(delayedEventHandler).asSequenceBarrier();
final BatchEventProcessor<TestEvent> processor =
new BatchEventProcessor<TestEvent>(ringBuffer, sequenceBarrier, handlerWithBarrier);
disruptor.handleEventsWith(processor);
ensureTwoEventsProcessedAccordingToDependencies(countDownLatch, delayedEventHandler);
}
@Test
public void shouldMakeEntriesAvailableToFirstHandlersImmediately() throws Exception {
CountDownLatch countDownLatch = new CountDownLatch(2);
EventHandler<TestEvent> eventHandler = new EventHandlerStub(countDownLatch);
disruptor.handleEventsWith(createDelayedEventHandler(), eventHandler);
ensureTwoEventsProcessedAccordingToDependencies(countDownLatch);
}
@Test(expected = IllegalArgumentException.class)
public void shouldTrackEventHandlersByIdentityNotEquality() throws Exception {
EvilEqualsEventHandler handler1 = new EvilEqualsEventHandler();
EvilEqualsEventHandler handler2 = new EvilEqualsEventHandler();
disruptor.handleEventsWith(handler1);
// handler2.equals(handler1) but it hasn't yet been registered so should throw exception.
disruptor.after(handler2);
}
@Test
public void shouldAllowSpecifyingSpecificEventProcessorsToWaitFor() throws Exception {
DelayedEventHandler handler1 = createDelayedEventHandler();
DelayedEventHandler handler2 = createDelayedEventHandler();
CountDownLatch countDownLatch = new CountDownLatch(2);
EventHandler<TestEvent> handlerWithBarrier = new EventHandlerStub(countDownLatch);
disruptor.handleEventsWith(handler1, handler2);
disruptor.after(handler1, handler2).handleEventsWith(handlerWithBarrier);
ensureTwoEventsProcessedAccordingToDependencies(countDownLatch, handler1, handler2);
}
@Test
public void
shouldWaitUntilAllFirstEventProcessorsProcessEventBeforeMakingItAvailableToDependentEventProcessors()
throws Exception {
DelayedEventHandler eventHandler1 = createDelayedEventHandler();
CountDownLatch countDownLatch = new CountDownLatch(2);
EventHandler<TestEvent> eventHandler2 = new EventHandlerStub(countDownLatch);
disruptor.handleEventsWith(eventHandler1).then(eventHandler2);
ensureTwoEventsProcessedAccordingToDependencies(countDownLatch, eventHandler1);
}
@Test
public void shouldCreateEventProcessorGroupForFirstEventProcessors() throws Exception {
executor.ignoreExecutions();
final EventHandler<TestEvent> eventHandler1 = new SleepingEventHandler();
EventHandler<TestEvent> eventHandler2 = new SleepingEventHandler();
final EventHandlerGroup<TestEvent> eventHandlerGroup =
disruptor.handleEventsWith(eventHandler1, eventHandler2);
disruptor.start();
assertNotNull(eventHandlerGroup);
assertThat(Integer.valueOf(executor.getExecutionCount()), equalTo(Integer.valueOf(2)));
}
@Test
public void shouldWaitOnAllProducersJoinedByAnd() throws Exception {
DelayedEventHandler handler1 = createDelayedEventHandler();
DelayedEventHandler handler2 = createDelayedEventHandler();
CountDownLatch countDownLatch = new CountDownLatch(2);
EventHandler<TestEvent> handlerWithBarrier = new EventHandlerStub(countDownLatch);
disruptor.handleEventsWith(handler1, handler2);
disruptor.after(handler1).and(handler2).handleEventsWith(handlerWithBarrier);
ensureTwoEventsProcessedAccordingToDependencies(countDownLatch, handler1, handler2);
}
@Test
public void shouldBeAbleToOverrideTheExceptionHandlerForAEventProcessor() throws Exception {
final RuntimeException testException = new RuntimeException();
final ExceptionThrowingEventHandler eventHandler =
new ExceptionThrowingEventHandler(testException);
disruptor.handleEventsWith(eventHandler);
AtomicReference<Throwable> reference = new AtomicReference<Throwable>();
StubExceptionHandler exceptionHandler = new StubExceptionHandler(reference);
disruptor.handleExceptionsFor(eventHandler).with(exceptionHandler);
publishEvent();
waitFor(reference);
}
@Test
public void shouldSupportSpecifyingADefaultExceptionHandlerForEventProcessors() throws Exception {
AtomicReference<Throwable> eventHandled = new AtomicReference<Throwable>();
ExceptionHandler exceptionHandler = new StubExceptionHandler(eventHandled);
RuntimeException testException = new RuntimeException();
ExceptionThrowingEventHandler handler = new ExceptionThrowingEventHandler(testException);
disruptor.handleExceptionsWith(exceptionHandler);
disruptor.handleEventsWith(handler);
publishEvent();
final Throwable actualException = waitFor(eventHandled);
assertSame(testException, actualException);
}
@Test
public void shouldBlockProducerUntilAllEventProcessorsHaveAdvanced() throws Exception {
final DelayedEventHandler delayedEventHandler = createDelayedEventHandler();
disruptor.handleEventsWith(delayedEventHandler);
final RingBuffer<TestEvent> ringBuffer = disruptor.start();
final StubPublisher stubPublisher = new StubPublisher(ringBuffer);
try {
executor.execute(stubPublisher);
assertProducerReaches(stubPublisher, 4, true);
delayedEventHandler.processEvent();
delayedEventHandler.processEvent();
delayedEventHandler.processEvent();
delayedEventHandler.processEvent();
delayedEventHandler.processEvent();
assertProducerReaches(stubPublisher, 5, false);
} finally {
stubPublisher.halt();
}
}