RAD - Case Study Version 2

David Burgun dburgun at dsl.pipex.com
Mon Mar 27 05:01:22 EST 2006


Hi Mark,

I looked at your example and the ISM stack I have developed is *VERY*  
similar to your mc2_libDispatcher. The only main difference I can see  
is that I have a secondary Message/Event ID which I call a "Kind".  
This is to allow you to have more than one copy of the same event.

There is also a difference in the way in which your example actually  
uses the Dispatcher, you do your "Listening" or "Registering" at the  
Stack level, which means you have to change the Stack Script when you  
add a control to the stack:

On 27 Mar 2006, at 07:08, Mark Wieder wrote:

> on openStack
>   start using stack "libDispatcher"
>   mc2_libDispatcher.Register the id of field "FileContents", \
>     "NewFile", the id of field "FolderContents"
>   mc2_libDispatcher.Register the id of field "FolderContents", \
>     "NewFolder", the id of button "Choose"
> end openStack

This means you are hardcoding control names into the stack. I *could*  
do it this way too, but in order to allow objects to be pasted and  
duped in a stack and have them just work without changing any other  
scripts, I do the "Register" at the control level.

Other than that the concepts are identical!

As I've explained, I don't bypass or in any way effect the existing  
message-passing hierarchy. ISM works *with* the xTalk environment.

Thanks for your input.

All the Best
Dave





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