| /* |
| * 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.geode.internal; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.junit.Test; |
| |
| |
| public class OneTaskOnlyDecoratorJUnitTest { |
| |
| /** |
| * Test to make sure we only execute the task once no matter how many times we schedule it. |
| */ |
| @Test |
| public void testExecuteOnlyOnce() throws Exception { |
| ScheduledExecutorService ex = Executors.newScheduledThreadPool(1); |
| |
| MyConflationListener listener = new MyConflationListener(); |
| OneTaskOnlyExecutor decorator = new OneTaskOnlyExecutor(ex, listener, null); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| ex.submit(new Callable() { |
| |
| @Override |
| public Object call() throws Exception { |
| latch.await(); |
| return null; |
| } |
| }); |
| |
| final AtomicInteger counter = new AtomicInteger(); |
| |
| Runnable increment = new Runnable() { |
| |
| @Override |
| public void run() { |
| counter.incrementAndGet(); |
| } |
| }; |
| |
| for (int i = 0; i < 50; i++) { |
| decorator.schedule(increment, 0, TimeUnit.SECONDS); |
| } |
| |
| assertEquals(0, counter.get()); |
| latch.countDown(); |
| ex.shutdown(); |
| ex.awaitTermination(60, TimeUnit.SECONDS); |
| assertEquals(1, counter.get()); |
| assertEquals(49, listener.getDropCount()); |
| } |
| |
| /** |
| * Test to make sure we reschedule the task for execution if it has already in progress. |
| */ |
| @Test |
| public void testReschedule() throws Exception { |
| ScheduledExecutorService ex = Executors.newScheduledThreadPool(1); |
| OneTaskOnlyExecutor decorator = new OneTaskOnlyExecutor(ex, null); |
| |
| final CountDownLatch taskRunning = new CountDownLatch(1); |
| final CountDownLatch continueTask = new CountDownLatch(1); |
| final AtomicInteger counter = new AtomicInteger(); |
| |
| Callable waitForLatch = new Callable() { |
| |
| @Override |
| public Object call() throws Exception { |
| taskRunning.countDown(); |
| continueTask.await(); |
| counter.incrementAndGet(); |
| return null; |
| } |
| }; |
| |
| Runnable increment = new Runnable() { |
| |
| @Override |
| public void run() { |
| counter.incrementAndGet(); |
| } |
| }; |
| |
| decorator.schedule(waitForLatch, 0, TimeUnit.SECONDS); |
| taskRunning.await(); |
| decorator.schedule(increment, 0, TimeUnit.SECONDS); |
| |
| assertEquals(0, counter.get()); |
| continueTask.countDown(); |
| |
| ex.shutdown(); |
| ex.awaitTermination(60, TimeUnit.SECONDS); |
| assertEquals(2, counter.get()); |
| } |
| |
| /** |
| * Test to make sure we reschedule the task for execution if the new requested execution is |
| * earlier than the previous one |
| */ |
| @Test |
| public void testRescheduleForEarlierTime() throws Exception { |
| ScheduledExecutorService ex = Executors.newScheduledThreadPool(1); |
| MyConflationListener listener = new MyConflationListener(); |
| OneTaskOnlyExecutor decorator = new OneTaskOnlyExecutor(ex, listener, null); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| final AtomicInteger counter = new AtomicInteger(); |
| |
| Runnable increment = new Runnable() { |
| |
| @Override |
| public void run() { |
| counter.incrementAndGet(); |
| } |
| }; |
| |
| decorator.schedule(increment, 120, TimeUnit.SECONDS); |
| decorator.schedule(increment, 10, TimeUnit.MILLISECONDS); |
| |
| long start = System.nanoTime(); |
| |
| ex.shutdown(); |
| ex.awaitTermination(60, TimeUnit.SECONDS); |
| long elapsed = System.nanoTime() - start; |
| assertEquals(1, counter.get()); |
| assertEquals(1, listener.getDropCount()); |
| assertTrue(elapsed < TimeUnit.SECONDS.toNanos(120)); |
| } |
| |
| private static class MyConflationListener |
| extends OneTaskOnlyExecutor.ConflatedTaskListenerAdapter { |
| private int dropCount; |
| |
| @Override |
| public void taskDropped() { |
| dropCount++; |
| } |
| |
| public int getDropCount() { |
| return dropCount; |
| } |
| } |
| } |