content: /**
   * 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.activemq.thread;
  
  import static org.junit.Assert.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  import org.junit.Test;
  
  public class TaskRunnerFactoryTest {
  
      /**
       * AMQ-6602 test
       * Test contention on createTaskRunner() to make sure that all threads end up
       * using a PooledTaskRunner
       *
       * @throws Exception
       */
      @Test
      public void testConcurrentTaskRunnerCreation() throws Exception {
  
          final TaskRunnerFactory factory = new TaskRunnerFactory();
          final ExecutorService service = Executors.newFixedThreadPool(10);
          final CountDownLatch latch1 = new CountDownLatch(1);
          final CountDownLatch latch2 = new CountDownLatch(10);
          final List<TaskRunner> runners = Collections.<TaskRunner>synchronizedList(new ArrayList<TaskRunner>(10));
  
          for (int i = 0; i < 10; i++) {
              service.execute(new Runnable() {
  
                  @Override
                  public void run() {
                      try {
                          latch1.await();
                      } catch (InterruptedException e) {
                         throw new IllegalStateException(e);
                      }
                      runners.add(factory.createTaskRunner(new Task() {
  
                          @Override
                          public boolean iterate() {
                              return false;
                          }
                      }, "task"));
                      latch2.countDown();
                  }
              });
          }
  
          latch1.countDown();
          latch2.await();
  
          for (TaskRunner runner : runners) {
              assertTrue(runner instanceof PooledTaskRunner);
          }
      }
  }
  