| package org.apache.helix.controller.stages; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.ListeningExecutorService; |
| import com.google.common.util.concurrent.MoreExecutors; |
| import org.apache.helix.common.ClusterEventBlockingQueue; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| |
| /** |
| * Test {@link ClusterEventBlockingQueue} to ensure that it coalesces events while keeping then in |
| * FIFO order. |
| */ |
| public class TestClusterEventBlockingQueue { |
| @Test |
| public void testEventQueue() throws Exception { |
| // initialize the queue |
| ClusterEventBlockingQueue queue = new ClusterEventBlockingQueue(); |
| |
| // add an event |
| ClusterEvent event1 = new ClusterEvent(ClusterEventType.IdealStateChange); |
| queue.put(event1); |
| Assert.assertEquals(queue.size(), 1); |
| |
| // add an event with a different name |
| ClusterEvent event2 = new ClusterEvent(ClusterEventType.ConfigChange); |
| queue.put(event2); |
| Assert.assertEquals(queue.size(), 2); |
| |
| // add an event with the same type as event1 (should not change queue size) |
| ClusterEvent newEvent1 = new ClusterEvent(ClusterEventType.IdealStateChange); |
| newEvent1.addAttribute("attr", 1); |
| queue.put(newEvent1); |
| Assert.assertEquals(queue.size(), 2); |
| |
| // test peek |
| ClusterEvent peeked = queue.peek(); |
| Assert.assertEquals(peeked.getEventType(), ClusterEventType.IdealStateChange); |
| Assert.assertEquals((int) peeked.getAttribute("attr"), 1); |
| Assert.assertEquals(queue.size(), 2); |
| |
| // test take the head |
| ListeningExecutorService service = |
| MoreExecutors.listeningDecorator(Executors.newCachedThreadPool()); |
| ClusterEvent takenEvent1 = safeTake(queue, service); |
| Assert.assertEquals(takenEvent1.getEventType(), ClusterEventType.IdealStateChange); |
| Assert.assertEquals((int) takenEvent1.getAttribute("attr"), 1); |
| Assert.assertEquals(queue.size(), 1); |
| |
| // test take the tail |
| ClusterEvent takenEvent2 = safeTake(queue, service); |
| Assert.assertEquals(takenEvent2.getEventType(), ClusterEventType.ConfigChange); |
| Assert.assertEquals(queue.size(), 0); |
| } |
| |
| private ClusterEvent safeTake(final ClusterEventBlockingQueue queue, |
| final ListeningExecutorService service) throws InterruptedException, ExecutionException, |
| TimeoutException { |
| // the take() in ClusterEventBlockingQueue will wait indefinitely |
| // for this test, stop waiting after 30 seconds |
| ListenableFuture<ClusterEvent> future = service.submit(new Callable<ClusterEvent>() { |
| @Override |
| public ClusterEvent call() throws InterruptedException { |
| return queue.take(); |
| } |
| }); |
| ClusterEvent event = future.get(30, TimeUnit.SECONDS); |
| return event; |
| } |
| } |