Peter --

This is terrific, and something that I've wanted to get into Squeak for
some time. I will try it out and let you know how things went.

Cheers,

Alan

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At 6:56 AM -0000 5/21/99, Peter Smet wrote:
>Ok,
>
>Here is a change set that implements publish-subscribe as described
>below for Squeak. I would really appreciate it if some people could
>file it in and take it for a test-drive. It seems to work fine for me at
>this stage, but I'm sure the code could be greatly improved.
>
>Lets put this open source stuff to the test - I would much rather
>that other people hacked into this code and improved it instead of
>working on it independently.
>
>Most of the code is in the class PostOffice under Publish-Subscribe,
>but some is in Object under the protocol Publish-Subscribe.
>
>Here's an extract from my original post:
>
>"
>
>I have been trying to implement a publish subscribe mechanism along
>the lines of Dolphin and VW. With it, any object can trigger events such as
>
>Transcript trigger: #bang.
>an interest in events is registered by the message:
>Transcript when: #bang send: #run to: self
>etc.
>
>The disadvantage of publish subscribe is that you must explicitly deregister
>objects from the mechanism for them to be garbage collected.
>I have tried to get around this by using  weakKeyDictionaries to hold both
>the publishers and the subscribers. If there are no remaining references to
>either the publisher or the subscriber, these will be garbage collected, and
>no events will be passed to these deceased objects.
>