| /* |
| * 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.test.concurrency; |
| |
| import static org.apache.geode.test.concurrency.Utilities.availableProcessors; |
| import static org.assertj.core.api.Assertions.assertThat; |
| |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.junit.Test; |
| import org.junit.runner.JUnitCore; |
| import org.junit.runner.RunWith; |
| |
| public class ConcurrentTestRunnerTest { |
| @Test |
| public void confirmThatInParallelRunsConcurrently() { |
| // We only need FailingTest to fail once for the following |
| // assertion to pass. ConcurrentTestRunner runs FailingTest |
| // 2000 times by default. It will stop running it once it |
| // sees it fail, which is what we want to see because it |
| // confirms that running inParallel actually runs concurrently. |
| assertThat(JUnitCore.runClasses(CheckForConcurrency.class).wasSuccessful()).isFalse(); |
| } |
| |
| /** |
| * This "test" is only meant to be run by confirmThatInParallelRunsConcurrently. |
| * If you run this "test" directly you can expect to see if fail. |
| */ |
| @RunWith(ConcurrentTestRunner.class) |
| public static class CheckForConcurrency { |
| @Test |
| public void validateConcurrentExecution(ParallelExecutor executor) |
| throws ExecutionException, InterruptedException { |
| final AtomicInteger atomicInteger = new AtomicInteger(0); |
| executor.inParallel(() -> { |
| int oldValue = atomicInteger.get(); |
| // We want to see the following assertion fail because that indicates |
| // that another thread currently modified the atomic. |
| assertThat(atomicInteger.compareAndSet(oldValue, oldValue + 1)).isTrue(); |
| }, availableProcessors()); |
| executor.execute(); |
| } |
| } |
| } |