"线程池中线程异常后：销毁还是复用？"

开发运维 2024-04-02 法医手机阅读

一、一个线程池中的线程异常了，那么线程池会怎么处理这个线程?

需要说明，本文的线程池都是java.util.concurrent.ExecutorService线程池，本文将围绕验证，阅读源码俩方面来解析这个问题。

二、代码验证

2.1 验证execute提交线程池中

2.1.1 测试代码：

public class ThreadPoolExecutorDeadTest {

    public static void main(String[] args) throws InterruptedException {
        ExecutorService executorService = buildThreadPoolExecutor();
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute-exception"));
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));

        Thread.sleep(5000);
        System.out.println("再次执行任务=======================");

        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));
        executorService.execute(() -> exeTask("execute"));
    }

    public static ExecutorService buildThreadPoolExecutor() {
        return new ThreadPoolExecutor(5, 10, 30, TimeUnit.SECONDS,
                new LinkedBlockingQueue(1000), new ThreadFactoryBuilder().setNameFormat("test-%s").build()
                , new ThreadPoolExecutor.CallerRunsPolicy());
    }

    private static void exeTask(String name) {
        String printStr = "[thread-name:" + Thread.currentThread().getName() + ",执行方式:" + name + "]";
        if ("execute-exception".equals(name)) {
            throw new RuntimeException(printStr + ", 我抛异常了");
        } else {
            System.out.println(printStr);
        }
    }
}