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Date: Thu, 17 Dec 2009 01:17:18 +0000 (UTC)
From: "Tim Thelin (JIRA)" <jira@apache.org>
To: shindig-issues@incubator.apache.org
Subject: [jira] Created: (SHINDIG-1249) Allow a container to publish
 messages to gadgets using pubsub
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Allow a container to publish messages to gadgets using pubsub
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                 Key: SHINDIG-1249
                 URL: https://issues.apache.org/jira/browse/SHINDIG-1249
             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


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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