你如何为GAE的任务引擎中的任务设置ETA？ [英] How do you set an ETA for a task in GAE's task engine?

问题描述

我试图在未来一小时内完成一项任务。这是我正在做的，似乎并不奏效。

  import static com.google.appengine.api.taskqueue。 TaskOptions.Builder提供*。 
 
 
日历cal = Calendar.getInstance（）; 
 cal.setTime（new Date（））; 
 cal.add（Calendar.HOUR，1）; 
 cal.getTime（）; 
 
队列队列= QueueFactory.getDefaultQueue（）; 
 queue.add（withUrl（/ task / doMyThing）。param（userId，userId）.header（X-AppEngine-TaskETA，cal.getTime（）。getTime（）+） ）; 
  

-edit

好一点更多的解释：当有人点击我的服务时，我想在他们点击服务后一小时内调用Java方法。我认为任务队列是在App Engine上执行此操作的最佳方式。我认为队列不会执行那个任务，除非ETA已经通过了。如果我接近这个错误的方式，并有更好的方法来完成它，请让我知道。

- 再次编辑

感谢您的答案，以下是我所做的记录：

 队列队列= QueueFactory.getDefaultQueue（） ; 
 queue.add（withUrl（/ task / sendReminder）.param（userId，userId）.countdownMillis（120000））; 
  

解决方案

我已经完成了您要做的事情但在Python中。我想你试图设置的头文件是appengine在从队列中启动一个任务时设置的，而不一定是在创建任务时设置的头文件。我认为您正在寻找 countdownMillis ，值为3600000。

I'm trying to run a task an hour in the future. Here's what I'm doing, doesn't seem to work.

import static com.google.appengine.api.taskqueue.TaskOptions.Builder.*;


Calendar cal = Calendar.getInstance(); 
cal.setTime(new Date()); 
cal.add(Calendar.HOUR, 1); 
cal.getTime(); 

Queue queue = QueueFactory.getDefaultQueue();
queue.add(withUrl("/task/doMyThing").param("userId", userId).header("X-AppEngine-TaskETA", cal.getTime().getTime()+""));

-edit

OK then a little more clarification: When someone hits my service I want to call a Java method exactly an hour after they hit the service. I assumed the task queue was the best way to do that on App Engine. I thought the queue would not execute that task unless the ETA had passed. If I'm approaching this the wrong way and there's a better way to accomplish it please let me know.

-edit again

Thanks for the answers, for the record here's what I did:

Queue queue = QueueFactory.getDefaultQueue();
queue.add(withUrl("/task/sendReminder").param("userId", userId).countdownMillis(120000));

解决方案

I've done what you're trying to do but in python. I think the header you're trying to set is one that appengine sets when it starts a task from the queue and not necessarily one that you set when you're creating the task. I think you're looking for countdownMillis with a value of 3600000.

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