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

[Michael Gliwinski]

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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