queuing task for frontend from backend (push queue)

[db.User('someone')]

Hi,

I have a task running on backend, which needs to schedule another
task to be run on frontend.

Can this be done?

Just omitting the 'target' param creates tasks which still run on the
backend.

(I'm using taskqueue API with the default push queue)

Thanks!

[Greg Darke]

In the recent 1.5.5 release we added a feature to allow just this
behaviour.
If you pass the new module level constant DEFAULT_APP_VERSION as value
for the target parameter the task will be enqueued on the default
version of your application.

You can use it as follows:

from google.appengine.api import taskqueue

task = taskqueue.Task(url='/', target=taskqueue.DEFAULT_APP_VERSION)
taskqueue.Queue().add(task)

# Or the following one-liner:
taskqueue.add(url='/', target=taskqueue.DEFAULT_APP_VERSION)

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[db.User('someone')]

Yep, found this in 1.5.5 release notes :)

Sidenote: 1.5.5 MSI failed to install on my XP

Thanks!

[stevep]

Have not yet done this, but plan to experiment with it. Presumably if
I run my on-line call handler in a non-default version, I can make on-
line handler calls to DEFAULT task queue tasks such that my DEFAULT
instance ends up only processing TQ items. I'm seeing this as a means
to effect a pseudo-high-reliability TQ (granted many issues might
affect its reliability, but I'll have reasonable control over this).

Thanks,
stevep

[Strom]

Is this also possible with the Java SDK? I couldn't find any 'target' parameter.

[Bogdan Nourescu]

Here is the documentation on target parameter:

https://developers.google.com/appengine/docs/java/config/queue#target