Hi,
I think we dont have to have observers on models, in many cases the it
very expensive to retrieve model values
If we mark a component as being dirty with a rerender() method (aka
repaint() in swing env., I called this "invalidate" in previous post) or
let the component call rerender() himself when significant change has
happened on him (like visible), in an Ajax render phase we just collect
the changes from the dirty components (or all if the page is marked dirty)
Jan Blok
Eelco Hillenius wrote:
As for the models, as long as we have an observer pattern implemented,
it is up to the model implementation how and when observers should be
notified.
Eelco
Johan Compagner wrote:
most db driven models don't know if they are dirty or not
For this kind of thing the developer itself can say invalidate
youreself (the component or maybe say it to the model) and render again.
Because i know or think you are changed.
You also have non db models (the non detachable once) and that one
can set the dirty flag by firing a property change where the
components who has
that model are setting the dirty flag)
then the question is should there be some automatic part where wicket
as a framework guesses now it is time to do the complete page render
or this component (that is backup by a database/detachable model)
render.
johan
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