Question

我上了这个课：

@Slf4j
@Component
public class MyScheduler {

    @Value("${scheduler.count}")
    private int SCHEDULER_COUNT;//for example 5

    private final SendRequestForResponseService sendRequestForResponseService;

    public MyScheduler(SendRequestForResponseService sendRequestForResponseService) {
        this.sendRequestForResponseService = sendRequestForResponseService;
    }

    @PostConstruct
    public void getRequestResponse() {
        ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(SCHEDULER_COUNT, new ThreadPoolTaskScheduler());
        for (int i = 0; i < SCHEDULER_COUNT; i++) {
            scheduledExecutorService.scheduleWithFixedDelay(sendRequestForResponseService::sendGetResponseRequest, 1, 1, TimeUnit.NANOSECONDS);
        }
    }
}

服务器启动后，我从属性（SCHEDULER_COUNT）中创建具有ScheduledExecutorService值的corePoolSize，并启动了SCHEDULER_COUNT次。现在，我有5个调度程序，分别触发1个NANOSECONDS。

现在，我需要对属性SCHEDULER_COUNT进行更改的机制，并使用新的cont（例如10）重新运行ScheduledExecutorService，而不重新启动服务器。有什么想法吗？

其中一个想法是编写一个rest服务，该服务将从该值重新加载并重新启动调度程序。但这是理论上的

Answer 1

我想您需要保留您的调度程序，以便您可以取消之前的任务：

@Slf4j
@Component
public class MyScheduler {
    private ScheduledExecutorService scheduledExecutorService;

    @Value("${scheduler.count}")
    private int SCHEDULER_COUNT;//for example 5

    private final SendRequestForResponseService sendRequestForResponseService;

    public MyScheduler(SendRequestForResponseService sendRequestForResponseService) {
        this.sendRequestForResponseService = sendRequestForResponseService;
    }

    @PostConstruct
    public void getRequestResponse() {
        setCount(env.getProperty("", Integer.class, 5);
    }

    public void setCount(int newCount) {
        if (scheduledExecutorService != null) {
            scheduledExecutorService.shutdown();
        }
        scheduledExecutorService = Executors.newScheduledThreadPool(SCHEDULER_COUNT, new ThreadPoolTaskScheduler());
        int schedulerCount = newCount;
        for (int i = 0; i < schedulerCount; i++) {
            scheduledExecutorService.scheduleWithFixedDelay
                (sendRequestForResponseService::sendGetResponseRequest, 1, 1,
                                                TimeUnit.NANOSECONDS);
        }
    }
}

然后可以通过REST服务完成对setCount的调用。

重新加载cheduleExecutorService，而无需重新加载服务器

1 个答案: