SpringBoot2线程池定义使用方法解析

@Slf4j
@EnableAsync
@Configuration
public class AsyncExecutorConfig implements AsyncConfigurer {

  @Bean
  public ThreadPoolTaskExecutor asyncServiceExecutor() {
    //返回可用处理器的虚拟机的最大数量不小于1
    int cpu = Runtime.getRuntime().availableProcessors();
    log.info("start asyncServiceExecutor cpu : {}", cpu);
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    //配置核心线程数
    executor.setCorePoolSize(cpu);
    //配置最大线程数
    executor.setMaxPoolSize(cpu);
    //配置队列大小
    executor.setQueueCapacity(50);
    //用来设置线程池关闭的时候等待所有任务都完成再继续销毁其他的Bean
    executor.setWaitForTasksToCompleteOnShutdown(true);
    //设置线程池中任务的等待时间，如果超过这个时候还没有销毁就强制销毁，以确保应用最后能够被关闭，而不是阻塞住
    executor.setAwaitTerminationSeconds(60);
    //配置线程池中的线程的名称前缀
    executor.setThreadNamePrefix("async-service-");
    // rejection-policy：当pool已经达到max size的时候，如何处理新任务
    // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
    // 使用预定义的异常处理类
    executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
    //执行初始化
    executor.initialize();
    return executor;
  }

  @Override
  public Executor getAsyncExecutor() {
    return asyncServiceExecutor();
  }

  @Override
  public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
    return (throwable, method, objects) -> {
      StringBuilder sb = new StringBuilder();
      for (Object param : objects) {
        sb.append(param).append(",");
      }
      log.error("Exception message - {}，Method name - {}，Parameter value - {}", throwable.getMessage(), method.getName(), sb.toString());
    };

  }
}

@Autowired  
private ThreadPoolTaskExecutor threadPoolTaskExecutor;

public void test(){
 CompletableFuture<Void> userFuture = CompletableFuture.runAsync(() -> System.out.println(111), threadPoolTaskExecutor);
}