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 java.util.List;
  import java.util.concurrent.Executor;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  /**
   * An {@link Executor} which will run every command on the current thread.
   */
  public class SynchronousThreadPoolExecutor extends ThreadPoolExecutor {
  
    /**
     * Constructor.
     *
     */
    public SynchronousThreadPoolExecutor() {
      super(1, 1, 0L, TimeUnit.MINUTES, new LinkedBlockingQueue<>());
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public void shutdown() {
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public List<Runnable> shutdownNow() {
      return null;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isShutdown() {
      return false;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isTerminated() {
      return false;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
      return false;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public void execute(Runnable command) {
      command.run();
    }
  }
  