Spring @Async取消并开始吗? [英] Spring @Async cancel and start?

问题描述

我有一个spring MVC应用程序，用户可以在其中通过单击按钮开始生成报告.此过程可能需要几分钟〜10-20分钟.我在服务调用周围使用springs @Async批注，以便异步生成报告.当我向用户弹出一条消息时，指示作业当前正在运行.现在，我想做的是，如果另一个用户(管理员)可以通过按钮启动报告生成，该按钮应取消/停止当前运行的@Async任务并重新启动新任务.为此，我致电

I have a spring MVC app where a user can kick off a Report generation via button click. This process could take few minutes ~ 10-20 mins. I use springs @Async annotation around the service call so that report generation happens asynchronously. While I pop a message to user indicating job is currently running. Now What I want to do is, if another user (Admin) can kick off Report generation via the button which should cancel/stop currently running @Async task and restart the new task. To do this, I call the

.. ..
future = getCurrentTask(id); // returns the current task for given report id
if (!future.isDone())
    future.cancel(true);

service.generateReport(id);

如何使其能够在将来的取消任务杀死所有正在运行的线程的同时让"service.generateReport"等待?根据文档，在我调用future.cancel(true)之后，isDone将返回true，而isCancelled将返回true.因此，无法知道该工作实际上已被取消.

How can make it so that "service.generateReport" waits while the future cancel task kills all the running threads? According to the documentation, after i call future.cancel(true), isDone will return true as well as isCancelled will return true. So there is no way of knowing the job is actually cancelled.

我只能在取消或完成旧报表后才开始生成新报表，以免弄脏数据.

I can only start new report generation when old one is cancelled or completed so that it would not dirty data.

推荐答案

来自 如果此方法返回true，则随后对isCancelled()的调用将始终返回true

尝试一下.

future = getCurrentTask(id); // returns the current task for given report id
if (!future.isDone()){
    boolean terminatedImmediately=future.cancel(true);
    if(terminatedImmediately)
        service.generateReport(id);
    else
        //Inform user existing job couldn't be stopped.And to try again  later
}

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