Spring线程池的配置及使用ThreadPoolTaskExecutor过程

@Configuration
@EnableAsync
public class ExecutorConfig {

    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    private int corePoolSize = 5;
    private int maxPoolSize = 10;
    private int queueCapacity = 99999;
    private String namePrefix = "async-service-";

    @Bean(name = "asyncServiceExecutor")
    public ThreadPoolTaskExecutor asyncServiceExecutor(){
        logger.info("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);

        // 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
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}

    @Resource(name = "asyncServiceExecutor")
    private ThreadPoolTaskExecutor executor;

	//定义计数器
	final CountDownLatch countDownLatch=new CountDownLatch(list.size());
	executor.execute(()-> {
                    try {
						//Do something
                    } catch (Exception e) {
                        log.error(e.getMessage());
                    } finally {
                        log.info(Thread.currentThread().getName() + "执行完成");
                        //计数器减一
                        countDownLatch.countDown();
                    }
                });

            try {
                countDownLatch.await();
                executor.shutdownNow();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //Do something

ExecutorService fixedThreadPool = Executors.newFixedThreadPool(5);
//定义计数器
	final CountDownLatch countDownLatch=new CountDownLatch(list.size());
	fixedThreadPool.execute(()-> {
                    try {
						//Do something
                    } catch (Exception e) {
                        log.error(e.getMessage());
                    } finally {
                        log.info(Thread.currentThread().getName() + "执行完成");
                        //计数器减一
                        countDownLatch.countDown();
                    }
                });

            try {
                countDownLatch.await();
                fixedThreadPool.shutdownNow();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //Do something