| /** |
| * 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 backtype.storm.utils; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import com.lmax.disruptor.BlockingWaitStrategy; |
| import com.lmax.disruptor.EventHandler; |
| import com.lmax.disruptor.InsufficientCapacityException; |
| import com.lmax.disruptor.MultiThreadedClaimStrategy; |
| import org.junit.Assert; |
| import org.junit.Test; |
| import junit.framework.TestCase; |
| |
| public class DisruptorQueueTest extends TestCase { |
| |
| private final static int TIMEOUT = 5; // MS |
| private final static int PRODUCER_NUM = 4; |
| |
| @Test |
| public void testMessageDisorder() throws InterruptedException { |
| |
| // Set queue length to bigger enough |
| DisruptorQueue queue = createQueue("messageOrder", 16); |
| |
| queue.publish("1"); |
| |
| Runnable producer = new Producer(queue, "2"); |
| |
| final Object [] result = new Object[1]; |
| Runnable consumer = new Consumer(queue, new EventHandler<Object>() { |
| private boolean head = true; |
| |
| @Override |
| public void onEvent(Object obj, long sequence, boolean endOfBatch) |
| throws Exception { |
| if (head) { |
| head = false; |
| result[0] = obj; |
| } |
| } |
| }); |
| |
| run(producer, consumer); |
| Assert.assertEquals("We expect to receive first published message first, but received " + result[0], |
| "1", result[0]); |
| } |
| |
| @Test |
| public void testConsumerHang() throws InterruptedException { |
| final AtomicBoolean messageConsumed = new AtomicBoolean(false); |
| |
| // Set queue length to 1, so that the RingBuffer can be easily full |
| // to trigger consumer blocking |
| DisruptorQueue queue = createQueue("consumerHang", 1); |
| Runnable producer = new Producer(queue, "msg"); |
| Runnable consumer = new Consumer(queue, new EventHandler<Object>() { |
| @Override |
| public void onEvent(Object obj, long sequence, boolean endOfBatch) |
| throws Exception { |
| messageConsumed.set(true); |
| } |
| }); |
| |
| run(producer, consumer); |
| Assert.assertTrue("disruptor message is never consumed due to consumer thread hangs", |
| messageConsumed.get()); |
| } |
| |
| |
| private void run(Runnable producer, Runnable consumer) |
| throws InterruptedException { |
| |
| Thread[] producerThreads = new Thread[PRODUCER_NUM]; |
| for (int i = 0; i < PRODUCER_NUM; i++) { |
| producerThreads[i] = new Thread(producer); |
| producerThreads[i].start(); |
| } |
| |
| Thread consumerThread = new Thread(consumer); |
| consumerThread.start(); |
| |
| for (int i = 0; i < PRODUCER_NUM; i++) { |
| producerThreads[i].interrupt(); |
| producerThreads[i].join(TIMEOUT); |
| } |
| consumerThread.interrupt(); |
| consumerThread.join(TIMEOUT); |
| } |
| |
| private class Producer implements Runnable { |
| private String msg; |
| private DisruptorQueue queue; |
| |
| Producer(DisruptorQueue queue, String msg) { |
| this.msg = msg; |
| this.queue = queue; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| while (true) { |
| queue.publish(msg, false); |
| } |
| } catch (InsufficientCapacityException e) { |
| return; |
| } |
| } |
| }; |
| |
| private class Consumer implements Runnable { |
| private EventHandler handler; |
| private DisruptorQueue queue; |
| |
| Consumer(DisruptorQueue queue, EventHandler handler) { |
| this.handler = handler; |
| this.queue = queue; |
| } |
| |
| @Override |
| public void run() { |
| queue.consumerStarted(); |
| try { |
| while(true) { |
| queue.consumeBatchWhenAvailable(handler); |
| } |
| }catch(RuntimeException e) { |
| //break |
| } |
| } |
| }; |
| |
| private static DisruptorQueue createQueue(String name, int queueSize) { |
| return new DisruptorQueue(name, new MultiThreadedClaimStrategy( |
| queueSize), new BlockingWaitStrategy()); |
| } |
| } |