[Rock-dev] improvement TaskContext.get

[Sylvain Joyeux]

On 11/03/2011 02:51 PM, Alexander Duda wrote:
> Currently I have a helper method for this in Vizkit.rb but I think it
> would be nice to move it into the method get
>
> thoughts?
I cannot disagree more. That's looking too much like silent error to me, 
and forbids giving any information about the reason for the failure.

I also don't like the caching behaviour ... I'm not sure of seeing all 
the implications of it, and that's a too important method to play that game.

Here's what I would propose: implement TaskContext.find(expression) 
which returns nil if the task cannot be found (but no caching !).

Ideally, the base method would even be find_all(expression), which 
returns all the tasks matching the expression (so that 
find_all(:provides => 'camera_base::Task') returns all cameras for 
instance). #find and #get would simply be built on top of it.
-- 
Sylvain Joyeux (Dr.Ing.)
Space & Security Robotics

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