Class ViewPoint
Jellyable --+
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Serializable --+
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Referenceable --+
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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.)
This can be useful when dealing with pb.Perspectives, Copyables, and Cacheables. 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.
The practical offshoot of this is that you can implement 2 varieties
of remotely callable methods on this Perspective; view_xxx and
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 |
| |
__init__(self,
perspective,
object)
Initialize me with a Perspective and an Object. |
| |
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. |
| Inherited from Referenceable |
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jellyFor(self,
jellier)
(internal) |
| Inherited from Jellyable |
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getStateFor(self,
jellier) |
| Class Variable Summary |
| Inherited from Referenceable |
NoneType |
perspective = None |
| Inherited from Jellyable |
tuple |
__implements__ = (<class twisted.spread.interfaces.IJell...
|
__init__(self,
perspective,
object)
(Constructor)
Initialize me with a Perspective and an Object.
-
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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.
-
- Overrides:
twisted.spread.flavors.Referenceable.remoteMessageReceived
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