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Google Wave: Up and Running
book

Google Wave: Up and Running

by Andres Ferrate
March 2010
Intermediate to advanced content levelIntermediate to advanced
304 pages
8h 23m
English
O'Reilly Media, Inc.
Content preview from Google Wave: Up and Running

Context

The context attribute is an optional attribute that can be included in event handlers to access various levels of blips associated with the event blip itself. Think of context as a blip-level configuration that allows you to limit or expand the objects sent with the event.

To specify context, you add one or more context attributes as parameters to the register_handler event. For example, the following code will include sibling and parent blips (as well as the event blip) when the ParticipantsAdded event is triggered:

myrobot.register_handler(events.ParticipantsAdded, 
context = event.Context.SIBLING + event.Context.PARENT)

Currently five case-insensitive context attributes are available:

PARENT

Send the parent of the event blip out.

SIBLINGS

Send the siblings (i.e., blips at the same level in the reply hierarchy as the event blip).

CHILDREN

Send the children of the blip out.

SELF

Send the blip itself. SELF is always sent out. However, if nothing is specified in the context tag, the default of PARENT + CHILDREN + SIBLINGS + SELF is sent out. SELF can be used to send only the event blip.

ALL

Do a recursive complete scan, and send out all blips in the wavelet (but not the blips of any private replies—these reside in different wavelets).

You can use context to limit the amount of objects passed to your robot with an event, thereby reducing the load on your robot, or you can ask for all the blips if you want to get the full context of a wavelet.[41]

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Publisher Resources

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