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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