SpringBoot线程池工具类

1.@Component注解将ThreadPoolUtil注入spring容器
2.容器启动后会首先执行@PostConstruct注解的initProcessorThreadPool方法,该方法初始化线程池配置
3.CountDownLatch count = new CountDownLatch(子线程数量);
使用多线程时,由于子线程都是异步执行的,所以要等所有子线程结束的话,可以用CountDownLatch阻塞主线程,子线程结束时通过countDown()方法减少计数值,切记countDown()要放在finally中,以防子线程异常中断导致的主线程一直阻塞;

@Component
public class ThreadPoolUtil {

@Value("${system-parameters.processor.corePoolSize:10}")
private int corePoolSize;

@Value("${system-parameters.processor.maximumPoolSize:10}")
private int maximumPoolSize;

private static ThreadPoolExecutor executor;

@PostConstruct
public void initProcessorThreadPool() {
    executor = new ThreadPoolExecutor(
            corePoolSize
            , maximumPoolSize
            , 60
            , TimeUnit.SECONDS
            , new SynchronousQueue<>(true) //公平策略,FIFO
            , new BlockRejectedExecutionHandler()
    );
}

public static <T> Future<T> submit(Callable<T> task) {
    return executor.submit(task);
}

public static void submit(Runnable runnable) {
    executor.submit(runnable);
}

private static class BlockRejectedExecutionHandler implements RejectedExecutionHandler {

    @Override
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        try {
            executor.getQueue().put(r);
        } catch (InterruptedException ignored) {
        }
    }
}

}