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
   *
   *      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.concurrent.BrokenBarrierException;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.CyclicBarrier;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class TaskRunnerTest {
  
      private static final Logger LOG = LoggerFactory.getLogger(TaskRunnerTest.class);
  
      @Test
      public void testWakeupPooled() throws InterruptedException, BrokenBarrierException {
          System.setProperty("org.apache.activemq.UseDedicatedTaskRunner", "false");
          doTestWakeup();
      }
  
      @Test
      public void testWakeupDedicated() throws InterruptedException, BrokenBarrierException {
          System.setProperty("org.apache.activemq.UseDedicatedTaskRunner", "true");
          doTestWakeup();
      }
  
      /**
       * Simulate multiple threads queuing work for the TaskRunner. The Task
       * Runner dequeues the work.
       *
       * @throws InterruptedException
       * @throws BrokenBarrierException
       */
      public void doTestWakeup() throws InterruptedException, BrokenBarrierException {
  
          final int enqueueCount = 100000;
          final AtomicInteger iterations = new AtomicInteger(0);
          final AtomicInteger counter = new AtomicInteger(0);
          final AtomicInteger queue = new AtomicInteger(0);
          final CountDownLatch doneCountDownLatch = new CountDownLatch(1);
  
          TaskRunnerFactory factory = new TaskRunnerFactory();
          final TaskRunner runner = factory.createTaskRunner(new Task() {
              @Override
              public boolean iterate() {
                  if (queue.get() == 0) {
                      return false;
                  } else {
                      while (queue.get() > 0) {
                          queue.decrementAndGet();
                          counter.incrementAndGet();
                      }
                      iterations.incrementAndGet();
                      if (counter.get() == enqueueCount) {
                          doneCountDownLatch.countDown();
                      }
                      return true;
                  }
              }
          }, "Thread Name");
  
          long start = System.currentTimeMillis();
          final int workerCount = 5;
          final CyclicBarrier barrier = new CyclicBarrier(workerCount + 1);
          for (int i = 0; i < workerCount; i++) {
              new Thread() {
                  @Override
                  public void run() {
                      try {
                          barrier.await();
                          for (int i = 0; i < enqueueCount / workerCount; i++) {
                              queue.incrementAndGet();
                              runner.wakeup();
                          }
                      } catch (BrokenBarrierException e) {
                      } catch (InterruptedException e) {
                      }
                  }
              }.start();
          }
          barrier.await();
  
          boolean b = doneCountDownLatch.await(30, TimeUnit.SECONDS);
          long end = System.currentTimeMillis();
          LOG.info("Iterations: " + iterations.get());
          LOG.info("counter: " + counter.get());
          LOG.info("Dequeues/s: " + (1000.0 * enqueueCount / (end - start)));
          LOG.info("duration: " + ((end - start) / 1000.0));
          assertTrue(b);
  
          runner.shutdown();
      }
  }
  