如何在谷歌应用程序引擎中将后台任务带到前台？
目前我有任务在后台运行。任务执行完成后，我需要显示输出。如何在 Google App Engine 中执行此操作？
任务完成后，我唯一能做的就是创建另一个应该显示输出的任务，或者还有其他方法吗？
Currently I have tasks running in background. After the tasks are done executing I need to show output. How do I do this in Google App Engine?
Once the tasks are done the only thing I can do is create another task which is supposed to show output or is there any other way?
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你不能“将任务带到前台”——它是一个网络服务器。服务器响应来自客户端的请求。
但是，您有多种选择可以完成类似的任务：
You can't "bring a task to the foreground" -- it is a webserver. The server responds to requests from the client.
But, you have a couple choices to accomplish something similar:
这不会像您所描述的那样直接起作用。
一旦后台任务启动，它就一直是后台任务。如果您想从后台任务返回一些信息给用户，您必须将其添加到数据存储中，并让前台处理程序检查数据存储中的该信息。
您也许还可以使用 Channel API 让后台任务直接向浏览器发送消息，但我不确定这是否有效（我还没有尝试过）。
如果您提供更多有关您想要完成的任务的更多信息，我可以尝试提供有关如何完成它的更多详细信息。
This won't work directly as you describe it.
Once a background task is started, it's a background task for its entire existence. If you want to return some information from the background task to the user, you'll have to add it to the datastore, and have a foreground handler check the datastore for that information.
You may also be able to use the Channel API to have a background task send messages directly to the browser, but I'm not sure if this will work or not (I haven't tried it).
If you give a little more information about exactly what you're trying to accomplish I can try to give more details about how to get it done.