> Thanks a lot Henrik.
>
> Laurent.
>
> On Tue, Apr 5, 2011 at 12:02 PM, Henrik Johansen <
[hidden email]> wrote:
> NonReentrantWeakMessageSend does what it says, while the message is being executed, additional evaluations will be discarded.
> It's used by when:sendOnce:to: protocol from Polymorph events, but unused in the base image.
> when:send:to:exclusive: is used one place though.
>
> It's useful when objects are mutually registered to each other's events, but the actions may lead to the others action being triggered.
> Examples are
> - two lists whose contents update based on the selection in the other
> - The DiffMorph (Uses ExclusiveWeakMessageSend)
>
> ExclusiveWeakMessageSend are used when the decision whether to process an event is shared between multiple objects.
> IE 2 objects respond to different events, but if received simultaneously, only the first of them should have it's action executed.
>
> With Announcement, the corresponding functionality to non-reentrancy would be achieved using:
> VW - AnnouncementCollection>>suspendWhile: anActionBlock
> Pharo - Announcer >> suspend: aSubscriber while: anActionBlock (As we neither have a specific AnnouncementCollection class, nor access to Registry itself. Not implemented yet though :P)
>
> The shared state required to achieve Exclusivity would probably have to recide outside of the framework.
>
> Cheers,
> Henry
>
>
> On Apr 4, 2011, at 9:59 56PM, laurent laffont wrote:
>
>> Today: NonReentrantWeakMessageSend
>>
>>
>> (ExclusiveWeakMessageSend aborted - no answer)
>>
>>
>> Comment Of The Day Contest - One Day One Comment
>> Rules:
>> #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s).
>> #2: If you cannot comment it, deprecate it.
>> Results:
http://code.google.com/p/pharo/wiki/CommentOfTheDayContest>>
>> Laurent
>
>
Locked
