| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.yarn.event; |
| |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.LinkedBlockingQueue; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.yarn.conf.YarnConfiguration; |
| import org.apache.hadoop.yarn.exceptions.YarnRuntimeException; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.mockito.Mockito.*; |
| |
| public class TestAsyncDispatcher { |
| |
| /* This test checks whether dispatcher hangs on close if following two things |
| * happen : |
| * 1. A thread which was putting event to event queue is interrupted. |
| * 2. Event queue is empty on close. |
| */ |
| @SuppressWarnings({ "unchecked", "rawtypes" }) |
| @Test(timeout=10000) |
| public void testDispatcherOnCloseIfQueueEmpty() throws Exception { |
| BlockingQueue<Event> eventQueue = spy(new LinkedBlockingQueue<Event>()); |
| Event event = mock(Event.class); |
| doThrow(new InterruptedException()).when(eventQueue).put(event); |
| DrainDispatcher disp = new DrainDispatcher(eventQueue); |
| disp.init(new Configuration()); |
| disp.setDrainEventsOnStop(); |
| disp.start(); |
| // Wait for event handler thread to start and begin waiting for events. |
| disp.waitForEventThreadToWait(); |
| try { |
| disp.getEventHandler().handle(event); |
| Assert.fail("Expected YarnRuntimeException"); |
| } catch (YarnRuntimeException e) { |
| Assert.assertTrue(e.getCause() instanceof InterruptedException); |
| } |
| // Queue should be empty and dispatcher should not hang on close |
| Assert.assertTrue("Event Queue should have been empty", |
| eventQueue.isEmpty()); |
| disp.close(); |
| } |
| |
| // Test dispatcher should timeout on draining events. |
| @Test(timeout=10000) |
| public void testDispatchStopOnTimeout() throws Exception { |
| BlockingQueue<Event> eventQueue = new LinkedBlockingQueue<Event>(); |
| eventQueue = spy(eventQueue); |
| // simulate dispatcher is not drained. |
| when(eventQueue.isEmpty()).thenReturn(false); |
| |
| YarnConfiguration conf = new YarnConfiguration(); |
| conf.setInt(YarnConfiguration.DISPATCHER_DRAIN_EVENTS_TIMEOUT, 2000); |
| DrainDispatcher disp = new DrainDispatcher(eventQueue); |
| disp.init(conf); |
| disp.setDrainEventsOnStop(); |
| disp.start(); |
| disp.waitForEventThreadToWait(); |
| disp.close(); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| private static class DummyHandler implements EventHandler<Event> { |
| @Override |
| public void handle(Event event) { |
| try { |
| Thread.sleep(500); |
| } catch (InterruptedException e) {} |
| } |
| } |
| |
| private enum DummyType { |
| DUMMY |
| } |
| |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| private void dispatchDummyEvents(Dispatcher disp, int count) { |
| for (int i = 0; i < count; i++) { |
| Event event = mock(Event.class); |
| when(event.getType()).thenReturn(DummyType.DUMMY); |
| disp.getEventHandler().handle(event); |
| } |
| } |
| |
| // Test if drain dispatcher drains events on stop. |
| @SuppressWarnings({ "rawtypes" }) |
| @Test(timeout=10000) |
| public void testDrainDispatcherDrainEventsOnStop() throws Exception { |
| YarnConfiguration conf = new YarnConfiguration(); |
| conf.setInt(YarnConfiguration.DISPATCHER_DRAIN_EVENTS_TIMEOUT, 2000); |
| BlockingQueue<Event> queue = new LinkedBlockingQueue<Event>(); |
| DrainDispatcher disp = new DrainDispatcher(queue); |
| disp.init(conf); |
| disp.register(DummyType.class, new DummyHandler()); |
| disp.setDrainEventsOnStop(); |
| disp.start(); |
| disp.waitForEventThreadToWait(); |
| dispatchDummyEvents(disp, 2); |
| disp.close(); |
| assertEquals(0, queue.size()); |
| } |
| } |
| |