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Package twisted :: Package spread :: Module flavors :: Class ViewPoint |
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Jellyable
--+ |Serializable
--+ |Referenceable
--+ | ViewPoint
I act as an indirect reference to an object accessed through a pb.Perspective
.
Simply put, I combine an object with a perspective so that when a peer calls methods on the object I refer to, the method will be invoked with that perspective as a first argument, so that it can know who is calling it.
While Viewable
objects will be converted to
ViewPoints by default when they are returned from or sent as arguments to
a remote method, any object may be manually proxied as well. (XXX: Now
that this class is no longer named Proxy
, this is the only
occourance of the term 'proxied' in this docstring, and may be
unclear.)
pb.Perspective
s, Copyable
s, and Cacheable
s. It is legal to implement a
method as such on a perspective:
| def perspective_getViewPointForOther(self, name): | defr = self.service.getPerspectiveRequest(name) | defr.addCallbacks(lambda x, self=self: ViewPoint(self, x), log.msg) | return defr
This will allow you to have references to Perspective objects in two
different ways. One is through the initial 'attach' call -- each peer
will have a pb.RemoteReference
to their perspective
directly. The other is through this method; each peer can get a pb.RemoteReference
to all other
perspectives in the service; but that pb.RemoteReference
will be to a ViewPoint
, not directly to the object.
perspective_xxx
. view_xxx
methods will follow
the rules for ViewPoint methods (see ViewPoint.remoteMessageReceived
), and
perspective_xxx
methods will follow the rules for
Perspective methods.
Method Summary | |
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Initialize me with a Perspective and an Object. | |
getStateFor(self,
jellier)
(inherited from Jellyable )
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(internal) (inherited from Referenceable )
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Return an ID unique to a proxy for this perspective+object combination. | |
A remote message has been received. |
Method Details |
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__init__(self,
perspective,
object)
Initialize me with a Perspective and an Object.
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processUniqueID(self)Return an ID unique to a proxy for this perspective+object combination. |
remoteMessageReceived(self, broker, message, args, kw)A remote message has been received. Dispatch it appropriately. The default implementation is to dispatch to a method called 'view_messagename ' to my Object and call it on my object
with the same arguments, modified by inserting my Perspective as the
first argument.
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