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Dahua ICC Open API SDK for Java

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package com.dahuatech.hutool.core.thread;

import com.dahuatech.hutool.core.exceptions.UtilException;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;

/**
 * 全局公共线程池

 * 此线程池是一个无限线程池，即加入的线程不等待任何线程，直接执行
 *
 * @author Looly
 */
public class GlobalThreadPool {
  private static ExecutorService executor;

  static {
    init();
  }

  private GlobalThreadPool() {}

  /** 初始化全局线程池 */
  public static synchronized void init() {
    if (null != executor) {
      executor.shutdownNow();
    }
    executor = ExecutorBuilder.create().useSynchronousQueue().build();
  }

  /**
   * 关闭公共线程池
   *
   * @param isNow 是否立即关闭而不等待正在执行的线程
   */
  public static synchronized void shutdown(boolean isNow) {
    if (null != executor) {
      if (isNow) {
        executor.shutdownNow();
      } else {
        executor.shutdown();
      }
    }
  }

  /**
   * 获得 {@link ExecutorService}
   *
   * @return {@link ExecutorService}
   */
  public static ExecutorService getExecutor() {
    return executor;
  }

  /**
   * 直接在公共线程池中执行线程
   *
   * @param runnable 可运行对象
   */
  public static void execute(Runnable runnable) {
    try {
      executor.execute(runnable);
    } catch (Exception e) {
      throw new UtilException(e, "Exception when running task!");
    }
  }

  /**
   * 执行有返回值的异步方法

   * Future代表一个异步执行的操作，通过get()方法可以获得操作的结果，如果异步操作还没有完成，则，get()会使当前线程阻塞
   *
   * @param  执行的Task
   * @param task {@link Callable}
   * @return Future
   */
  public static  Future submit(Callable task) {
    return executor.submit(task);
  }

  /**
   * 执行有返回值的异步方法

   * Future代表一个异步执行的操作，通过get()方法可以获得操作的结果，如果异步操作还没有完成，则，get()会使当前线程阻塞
   *
   * @param runnable 可运行对象
   * @return {@link Future}
   * @since 3.0.5
   */
  public static Future submit(Runnable runnable) {
    return executor.submit(runnable);
  }
}