Re: [Fab-user] Task.run() and task decorators

[Rich Andrews]

Michael,

Wrapping TaskSubclass.run() with runs_once works well.

Best,

Rich

On Tue, Dec 17, 2013 at 6:29 AM, Michael Gliwinski <address@hidden> wrote:

On Monday 16 Dec 2013 13:28:50 Rich Andrews wrote:
...

> We might be closer to answering question with this example. It appears both
> WrappedCallableTask and the Task subclass are run() for each host present
> in the fab role being treated, though the @runs_once decorator is present.
>
> So then a more articulate question may be, "How does a Task subclass know
> the intentions of the decorators following its @task(task_class=)
> declaration?"

Well, what I was going by is that runs_once is implemented as a memoizing
function, i.e. it just saves result of the wrapped callable in an attribute of
that callable, and avoids calling it when that attribute is already present.

So the Task subclass doesn't need to know anything, it's just if you wanted
the run() method to execute only once, *it* would have to be the callable
wrapped in runs_once (or be implemented in a similar way).

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