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.ambari.server.utils;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.awaitility.Awaitility;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class ManagedThreadPoolExecutorTest {
  
    @Test
    public void isStoppedAfterCreation() {
      ManagedThreadPoolExecutor executor = createExecutor(1);
      executor.execute(Assert::fail);
      assertFalse(executor.isRunning());
    }
  
    @Test
    public void canBeStartedAndStopped() {
      ManagedThreadPoolExecutor executor = createExecutor(1);
      executor.submit(() -> Boolean.TRUE);
  
      executor.start();
      assertTrue(executor.isRunning());
      executor.stop();
      assertFalse(executor.isRunning());
    }
  
    @Test
    public void retainsTasksUntilStarted() {
      final int taskCount = 60;
      final AtomicInteger counter = new AtomicInteger();
      ManagedThreadPoolExecutor executor = createExecutor(10);
  
      for (int i = 0; i < taskCount; ++i) {
        executor.execute(counter::incrementAndGet);
      }
  
      executor.start();
      Awaitility.await().atMost(2, TimeUnit.SECONDS)
        .until(() -> counter.get() == taskCount);
    }
  
    private static ManagedThreadPoolExecutor createExecutor(int poolSize) {
      return new ManagedThreadPoolExecutor(poolSize, poolSize,
        0L, TimeUnit.MILLISECONDS,
        new LinkedBlockingQueue<>());
    }
  }
  