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

import java.util.LinkedHashSet;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;

/**
 * 线程同步结束器

 * 在完成一组正在其他线程中执行的操作之前，它允许一个或多个线程一直等待。
 *
 *  * ps:
 * //模拟1000个线程并发
 * SyncFinisher sf = new SyncFinisher(1000);
 * concurrencyTestUtil.run(() -> {
 *      // 需要并发测试的业务代码
 * });
 * 
 *
 * @author Looly
 * @since 4.1.15
 */
public class SyncFinisher {

  private Set workers;
  private int threadSize;
  private ExecutorService executorService;

  private boolean isBeginAtSameTime;
  /** 启动同步器，用于保证所有worker线程同时开始 */
  private CountDownLatch beginLatch;
  /** 结束同步器，用于等待所有worker线程同时结束 */
  private CountDownLatch endLatch;

  /**
   * 构造
   *
   * @param threadSize 线程数
   */
  public SyncFinisher(int threadSize) {
    this.beginLatch = new CountDownLatch(1);
    this.threadSize = threadSize;
    this.executorService = ThreadUtil.newExecutor(threadSize);
    this.workers = new LinkedHashSet<>();
  }

  /**
   * 设置是否所有worker线程同时开始
   *
   * @param isBeginAtSameTime 是否所有worker线程同时开始
   * @return this
   */
  public SyncFinisher setBeginAtSameTime(boolean isBeginAtSameTime) {
    this.isBeginAtSameTime = isBeginAtSameTime;
    return this;
  }

  /**
   * 增加定义的线程数同等数量的worker
   *
   * @param runnable 工作线程
   * @return this
   */
  public SyncFinisher addRepeatWorker(final Runnable runnable) {
    for (int i = 0; i < this.threadSize; i++) {
      addWorker(
          new Worker() {
            @Override
            public void work() {
              runnable.run();
            }
          });
    }
    return this;
  }

  /**
   * 增加工作线程
   *
   * @param runnable 工作线程
   * @return this
   */
  public SyncFinisher addWorker(final Runnable runnable) {
    return addWorker(
        new Worker() {
          @Override
          public void work() {
            runnable.run();
          }
        });
  }

  /**
   * 增加工作线程
   *
   * @param worker 工作线程
   * @return this
   */
  public synchronized SyncFinisher addWorker(Worker worker) {
    workers.add(worker);
    return this;
  }

  /** 开始工作 */
  public void start() {
    start(true);
  }

  /**
   * 开始工作
   *
   * @param sync 是否阻塞等待
   * @since 4.5.8
   */
  public void start(boolean sync) {
    endLatch = new CountDownLatch(workers.size());
    for (Worker worker : workers) {
      executorService.submit(worker);
    }
    // 保证所有worker同时开始
    this.beginLatch.countDown();

    if (sync) {
      try {
        this.endLatch.await();
      } catch (InterruptedException e) {
        throw new UtilException(e);
      }
    }
  }

  /**
   * 等待所有Worker工作结束，否则阻塞
   *
   * @throws InterruptedException 用户中断
   * @deprecated 使用start方法指定是否阻塞等待
   */
  @Deprecated
  public void await() throws InterruptedException {
    if (endLatch == null) {
      throw new NotInitedException("Please call start() method first!");
    }

    endLatch.await();
  }

  /** 清空工作线程对象 */
  public void clearWorker() {
    workers.clear();
  }

  /**
   * 剩余任务数
   *
   * @return 剩余任务数
   */
  public long count() {
    return endLatch.getCount();
  }

  /**
   * 工作者，为一个线程
   *
   * @author xiaoleilu
   */
  public abstract class Worker implements Runnable {

    @Override
    public void run() {
      if (isBeginAtSameTime) {
        try {
          beginLatch.await();
        } catch (InterruptedException e) {
          throw new UtilException(e);
        }
      }
      try {
        work();
      } finally {
        endLatch.countDown();
      }
    }

    public abstract void work();
  }
}