[Rock-dev] Property change function

[Matthias Goldhoorn]

On 12.04.2013 11:14, Sylvain Joyeux wrote:
> On 04/12/2013 11:00 AM, Matthias Goldhoorn wrote:
>> I rember there was a discussion about dynamic and static properties.
>>
>> How's the current state of this?.
>> I currently need a way to check if an property was changed.
>> It's annoying to cache them in the task every time. Since this is need
>> often is there an way to integrate this to orogen/rtt?
> Personally did not have time. Now, it is a pretty simple change (well 
> within your grasp ;-)
>
> On the orogen side, the idea was to add a #dynamic flag to the 
> property declaration. When that flag is set, we add a setter operation 
> which (by default) simply writes the property. Since operations are 
> virtual methods, it can be overriden by the user to be notified when 
> the property changes. The setter operation name would be generated 
> from the property name, e.g.
>
>   property('timeout', 'double').
>     dynamic
>
> would create an operation called setTimeout(double). Additionally, the 
> operation should return a boolean, so that the component can reject 
> the property change.
>
> On the runtime side, the Orocos::Property class would initially check 
> if such a property exists. If it does, it uses it in #write. 
> Otherwise, it uses the normal method. We would also need a new 
> exception type (e.g. PropertyChangeRejected) that is raised when the 
> setter returns false.
>
Here are the Patches for orogen and ocoros.rb to review//merge

Greetings,
Matthias



-- 
  Dipl.-Inf. Matthias Goldhoorn
  Space and Underwater Robotic

  Universität Bremen
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