content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.util.executor;
  
  import alluxio.util.ThreadFactoryUtils;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  /**
   * Convenience methods for constructing instances of {@link ExecutorServiceFactory}.
   */
  public final class ExecutorServiceFactories {
    /**
     * Returns a {@link ExecutorServiceFactory} which creates threadpool executors with the given base
     * name. Created threads will be daemonic.
     *
     * @param name the base name for executor thread names
     * @return the {@link ExecutorServiceFactory}
     */
    public static ExecutorServiceFactory cachedThreadPool(String name) {
      return () -> Executors.newCachedThreadPool(ThreadFactoryUtils.build(name + "-%d", true));
    }
  
    /**
     * Returns a {@link ExecutorServiceFactory} which creates threadpool executors with the given base
     * name and number of threads. Created threads will be daemonic.
     *
     * @param name the base name for executor thread names
     * @param nThreads the number of threads to create executors with
     * @return the {@link ExecutorServiceFactory}
     */
    public static ExecutorServiceFactory fixedThreadPool(String name, int nThreads) {
      return () -> Executors.newFixedThreadPool(nThreads,
          ThreadFactoryUtils.build(name + "-%d", true));
    }
  
    /**
     * @param executorService the executor service to supply
     * @return an {@link ExecutorServiceFactory} which always returns the given
     *         {@link ExecutorService}
     */
    public static ExecutorServiceFactory constantExecutorServiceFactory(
        ExecutorService executorService) {
      return () -> executorService;
    }
  
    private ExecutorServiceFactories() {} // Not intended for instantiation.
  }
  