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.cassandra.concurrent;
  
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.Semaphore;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import static org.apache.cassandra.concurrent.ExecutorFactory.SystemThreadTag.DAEMON;
  
  public class InfiniteLoopExecutorTest
  {
      @Test
      public void testShutdownNow() throws InterruptedException, ExecutionException, TimeoutException
      {
          Semaphore semaphore = new Semaphore(0);
          InfiniteLoopExecutor e1 = new InfiniteLoopExecutor("test", ignore -> semaphore.acquire(1), DAEMON);
          ExecutorService exec = Executors.newCachedThreadPool();
          Future<?> f = exec.submit(() -> e1.awaitTermination(1L, TimeUnit.MINUTES));
          e1.shutdownNow();
          f.get(1L, TimeUnit.SECONDS);
      }
  
      @Test
      public void testShutdown() throws InterruptedException, ExecutionException, TimeoutException
      {
          AtomicBoolean active = new AtomicBoolean(false);
          Semaphore semaphore = new Semaphore(0);
          InfiniteLoopExecutor e1 = new InfiniteLoopExecutor("test", ignore -> {
              active.set(true);
              semaphore.acquire(1);
              active.set(false);
              semaphore.release();
          }, DAEMON);
          ExecutorService exec = Executors.newCachedThreadPool();
          Future<?> f = exec.submit(() -> e1.awaitTermination(1L, TimeUnit.MINUTES));
          // do ten normal loops
          for (int i = 0 ; i < 10 ; ++i)
          {
              semaphore.release();
              semaphore.acquire();
          }
          // confirm we've re-entered the runnable
          while (!active.get()) Thread.yield();
          // then shutdown, and expect precisely one more
          e1.shutdown();
          try
          {
              f.get(10L, TimeUnit.MILLISECONDS);
              Assert.fail();
          }
          catch (TimeoutException ignore)
          {
          }
          semaphore.release();
          f.get(1L, TimeUnit.SECONDS);
      }
  }
  