springboot gracefully closed

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springboot gracefully closed

 

Application: When the service is shut down to upgrade the service, if there are still threads running, you can wait for a period of time to close the application; if the thread is not executed and close the application, a corresponding prompt will be output

 

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Examples

 

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config layer

 

GracefulShutDown

@Component
public class GracefulShutDown implements TomcatConnectorCustomizer,
        ApplicationListener<ContextClosedEvent> {

    private Logger logger= LoggerFactory.getLogger(GracefulShutDown.class);

    private Connector connector;

    @Override
    public void customize(Connector connector) {
        this.connector=connector;
    }

    @Override
    public void onApplicationEvent(ContextClosedEvent contextClosedEvent) {  //容器关闭之前调用
        this.connector.pause();
        Executor executor=this.connector.getProtocolHandler().getExecutor();

        if (executor instanceof ThreadPoolExecutor){
            ThreadPoolExecutor threadPoolExecutor=(ThreadPoolExecutor) executor;
            threadPoolExecutor.shutdown();  //若无线程运行，立即关闭线程池；若有线程运行则等待

            try {
                if (!threadPoolExecutor.awaitTermination(10, TimeUnit.SECONDS)){
                                            //等待10s，为false表示线程池没有关闭，随后强制关闭，此时正在执行的任务中断，只执行了一部分，控制台输出warn日志
                    logger.warn("10秒后线程未关闭，将强制关闭");
                }else {
                    System.out.println("线程池已关闭："+ LocalDateTime.now());
                }                           //为true，线程池已经关闭，任务执行完成
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}

 

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controller layer

 

HelloController

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello(){
        try{
            Thread.sleep(2000);
        }catch (Exception e){
            System.out.println(e.getMessage());
        }

        return "hello world";
    }

    @RequestMapping("/hello2")
    public String hello2(){

        try{
            Thread.sleep(20000);
        }catch (Exception e){
            System.out.println(e.getMessage());
        }

        return "hello world";
    }
}

 

 

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Use test

 

/hello

      

Note: When ctrl + c completes task execution, the thread pool is immediately closed

 

/hello2

      

Note: When ctrl + c is executed, the task does not end, and the thread pool is not closed immediately; after 10s, the thread pool is forcibly closed, the task is not completed, and no result is returned.