On 25 Oct 2014, at 2:42 , Jan B. <bliznjan@fit.cvut.cz> wrote:

Hi all

Today I come with a question regarding announcements.
I would like to make announcement subscription which would remove itself
after first use.
Something like...

anObject announcer
   subscribe: TRMouseDragEnd
   do: [ :event |
       self thisMethodWith: differentParameters.
       "anObject announcer removeSubscription: ...this one..." ].

All I was able to do is write there
anObject announcer unsubscribe: self.
which somehow works, but this instance could have multiple subscriptions and
it would remove even those I don't want to remove, I need to remove only
this specific one...

Jan



--
View this message in context: http://forum.world.st/Self-removing-announcement-subscription-tp4786622.html
Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.


Modify:
AnnouncementSubscription >> #deliver: 
" deliver an announcement to receiver. In case of failure, it will be handled in separate process"

^ (self handlesAnnouncement: anAnnouncement ) ifTrue: [
[action cull: anAnnouncement cull: announcer cull: self] 
on: UnhandledError fork: [:ex | ex pass ]]

and you could use the block:
[:event :announcer :sub |
self thisMethodWith: differentParameters
announcer removeSubscription: sub ]

VW already does this for their announcement implementation, it might be a good idea to introduce the third parameter in stock Pharo as well.

Cheers,
Henry