java - Play Framework : Call Controller/URL from within a Job

Question

我有一份按小时运行的工作。我想像这样调用 Controller 的操作方法:

public class MyJob extends Job {

    @Override
    public void doJob() throws Exception {
        MyController.someActionMethod();
    }
}

或直接调用 URL。

如果这可以在工作中实现，有什么想法吗？

如果我直接调用 Controller 的操作方法，我会得到:

NullPointerException occured : null

play.exceptions.JavaExecutionException
    at play.jobs.Job.call(Job.java:155)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
    at play.classloading.enhancers.ControllersEnhancer$ControllerInstrumentation.isActionCallAllowed(ControllersEnhancer.java:187)
    at controllers.MyController.someActionMethod(MyController.java)
    at fun.job.MyJob.doJob(MyJob.java:10)
    at play.jobs.Job.doJobWithResult(Job.java:50)
    at play.jobs.Job.call(Job.java:146)
    ... 7 more

Answer 1

您可以使用 WS 帮助程序类。例如，

HttpResponse response = WS.url("http://www.yahoo.com/").get()
String html = response.getString(); // or...
Document xml = response.getXml();

您上面所做的操作会尝试将浏览器重定向到与 Controller 操作关联的 URL，这从异步作业的上下文中没有意义，其中除其他原因外，没有浏览器可以处理重定向。