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From "Tim Thelin (JIRA)" <>
Subject [jira] Updated: (SHINDIG-1249) Allow a container to publish messages to gadgets using pubsub
Date Thu, 17 Dec 2009 01:21:18 GMT


Tim Thelin updated SHINDIG-1249:

    Attachment: example.patch

As mentioned in the original description, the first patch (pubsub.patch) implements the improvement,
while the second patch (example.patch) modifies the sample container to demonstrate the improvement.
 The second patch isn't intended to be applied to resolve this issue; I just wanted to provide
an example of how it works.

> Allow a container to publish messages to gadgets using pubsub
> -------------------------------------------------------------
>                 Key: SHINDIG-1249
>                 URL:
>             Project: Shindig
>          Issue Type: Improvement
>          Components: Javascript 
>    Affects Versions: 1.0
>         Environment: Environment neutral - it's a javascript change to pusub-router.js
to expose a publish method
>            Reporter: Tim Thelin
>            Priority: Minor
>         Attachments: example.patch, pubsub.patch
>   Original Estimate: 0.25h
>  Remaining Estimate: 0.25h
> pubsub is a great way to broadcast messages to gadgets, but the current implementation
only allows gadgets to publish messages.  The provided patch allows the container to publish
messages too (using the same publish signature the gadgets use).  The ability to subscribe
and unsubsribe isn't needed because the container can already pass in a callback that is called
whenever a message is received, which allows it to listen in on all channels.
> This improvement is useful because it allows a container to have global state, and communicate
that global state to any interested gadgets.  The best example is a common date control (in
the container), and all gadgets can listen for date changes (through a channel that the container
publishes changes to).
> There are two patches.  The first implements the change and is minimal.  The second changes
the sample container example to show the change in action.  The sample container is modified
to add a button that does a container publish, and a new minimal gadget is introduced that
responds to the publish.  This second patch isn't intended to be applied to shindig, it''s
just meant to provide an example of this improvement to whoever picks up this issue.

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