[cgiapp] Re: Yet another callback system proposal

[Mark Stosberg <suppressed>]

On 2005-05-20, Cees Hek <suppressed> wrote:
>
> Well how about this for a radical proposal...  Lets drop positioning
> completely from the first version!  If it is not there, then it will
> be easy to alter later.  I think once we have a system where people
> can actually start using the callbacks, we will see the requirements a
> lot quicker and be able to deal with them appropriately when we have a
> better (clearer) understanding of the problem space.
>
> We still need to be consistent in the execution so that it is
> repeatable, but we can use a simple fifo system where the first
> callback registered is the first to be executed.  Some control can
> still be had in the execution order by reordering the loading of
> plugins or registering of callbacks and such...
>
> What is important to me right now is to have a system of callbacks
> that can be registered at the class level and at the object level. 
> Ordering is not that important to me right now, and won't be until we
> have a lot of plugins that use the callbacks system.  If a user uses
> the callbacks without using any of the plugins, then they control
> exactly when all the callbacks get registered, so ordering is not
> important there.  It only comes into play when using third party
> plugins, and even then we may find that it is a solvable problem
> without resorting to strict positioning of callbacks.

Cees++

I do feel there is a consensus that callbacks are desirable, and
registering them at the class and object level is desirable as well.

That seems very reasonable to move forward with as a first step. 

Cees, do you want to take what you like best of your patch and the other
refinements to it and craft them into a new proposal-as-code?

Mark


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