content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * Licensed 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
   *
   * https://opensource.org/licenses/Apache-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 com.tencent.angel.model.io;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import java.util.concurrent.ForkJoinPool;
  import java.util.concurrent.ForkJoinTask;
  
  /**
   * Master Matrix disk io operation executors.
   */
  public class IOExecutors {
    private static final Log LOG = LogFactory.getLog(IOExecutors.class);
    private final int poolSize;
    private volatile ForkJoinPool pool;
  
    public IOExecutors(int poolSize) {
      this.poolSize = poolSize;
    }
  
    public void init() {
  
    }
  
    public void start() {
      pool = new ForkJoinPool(poolSize);
    }
  
    /**
     * Execute a task use ForkJoin
     *
     * @param task a implementation of ForkJoinTask
     */
    public void execute(ForkJoinTask task) {
      pool.execute(task);
    }
  
    /**
     * Execute a task
     *
     * @param task a implementation of Runnable
     */
    public void execute(Runnable task) {
      pool.execute(task);
    }
  
    /**
     * Shut down all workers
     */
    public void shutdown() {
      if (pool != null) {
        pool.shutdownNow();
        pool = null;
      }
    }
  }
  