从Spring Shell执行Shell命令 [英] Execute shell commands from Spring Shell

问题描述

我有一个要问的问题，我可以用Spring Shell解决吗? 我有一个main.jar应用程序，该应用程序在Wildly服务器上部署了几个Scheduled Spring Jobs.就我而言，我无法停止或重新部署main.jar，因为必须不间断地提供服务.

I have a case which I want to ask can I solve with Spring Shell. I have a main.jar application which have several Scheduled Spring Jobs deployed on Wildly server. In my case I can't stop or redeploy the main.jar because the service must be provided non-stop.

我需要一种从终端启动/停止/重新启动计划的春季作业的方法.例如，在Apache Karaf中，有一个我可以通过telnet使用的外壳.

I need a way to start/stop/restart the Scheduled Spring Jobs from the terminal. For example in Apache Karaf there is a shell which I can use via telnet.

Spring Shell中是否有一些类似的解决方案，因此可以让我从linux终端执行命令.

Is there some similar solution in Spring Shell so that can let me execute commands from the linux terminal.

推荐答案

对于简单的计划任务，spring/spring-boot中没有开箱即用的CLI控件.

For simple scheduled tasks, there's no CLI control out of the box in spring/spring-boot.

您将需要自己实施.

下面是一个简单的示例，说明如何使用Spring Shell控制计划的任务以及如何在命令行中显示start/stop方法.

Below is a simple example of how you can control your scheduled tasks and expose the start/stop methods to the command line using spring shell.

让我们考虑一下所有计划任务的通用界面:

Let's consider you have a common interface for all scheduled tasks:

public interface WithCliControl {
    void start();
    void stop();
}

因此，一个简单的计划任务将如下所示:

So a simple scheduled task will look like:

@Component
public class MyScheduledTask implements WithCliControl {

    private AtomicBoolean enabled = new AtomicBoolean(true);

    @Scheduled(fixedRate = 5000L)
    public void doJob() {
        if (enabled.get()) {
            System.out.println("job is enabled");
            //do your thing
        }
    }

    @Override
    public void start() {
        enabled.set(true);
    }

    @Override
    public void stop() {
        enabled.set(false);
    }
}

以及相应的CLI组件如下所示:

and the corresponding CLI component will look like:

@ShellComponent
public class MyScheduledTaskCommands {

    private final MyScheduledTask myScheduledTask;

    public MyScheduledTaskCommands(final MyScheduledTask myScheduledTask) {
        this.myScheduledTask = myScheduledTask;
    }

    @ShellMethod("start task")
    public void start() {
        myScheduledTask.start();
    }

    @ShellMethod("stop task")
    public void stop() {
        myScheduledTask.stop();
    }
}

@ShellComponent和@ShellMethod将这些方法公开给Spring Shell进程.

@ShellComponent and @ShellMethod are exposing the methods to the Spring Shell process.

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