class twisted.spread.pb.RemoteCache(RemoteCopy, Serializable): (source)
Known subclasses: twisted.spread.publish.RemotePublished
A cache is a local representation of a remote Cacheable object.
This represents the last known state of this object. It may also have methods invoked on it -- in order to update caches, the cached class generates a pb.RemoteReference to this object as it is originally sent.
Much like copy, I will be invoked with no arguments. Do not implement a constructor that requires arguments in one of my subclasses.
| Method | remoteMessageReceived | A remote message has been received. Dispatch it appropriately. |
| Method | jellyFor | serialize me (only for the broker I'm for) as the original cached reference |
| Method | unjellyFor | Perform the inverse operation of Jellyable.jellyFor. |
| Instance Variable | broker | Undocumented |
| Instance Variable | luid | Undocumented |
| Instance Variable | __dict__ | Undocumented |
| Method | __cmp__ | Compare me [to another RemoteCache. |
| Method | __hash__ | Hash me. |
| Method | __del__ | Do distributed reference counting on finalize. |
| Method | _borgify | Create a new object that shares its state (i.e. its __dict__) and type with this object, but does not share its identity. |
Inherited from RemoteCopy:
| Method | setCopyableState | I will be invoked with the state to copy locally. |
Inherited from Unjellyable (via RemoteCopy):
| Method | setStateFor | Undocumented |
Inherited from Serializable:
| Method | processUniqueID | Return an ID which uniquely represents this object for this process. |
Inherited from Jellyable (via Serializable):
| Method | getStateFor | Undocumented |
A remote message has been received. Dispatch it appropriately.
The default implementation is to dispatch to a method called 'observe_messagename' and call it on my with the same arguments.
serialize me (only for the broker I'm for) as the original cached reference
Perform the inverse operation of Jellyable.jellyFor.
| See Also | twisted.spread.interfaces.IUnjellyable.unjellyFor | |
Create a new object that shares its state (i.e. its __dict__) and type with this object, but does not share its identity.
This is an instance of the Borg design pattern originally described by Alex Martelli, but unlike the example given there, this is not a replacement for a Singleton. Instead, it is for lifecycle tracking (and distributed garbage collection). The purpose of these separate objects is to have a separate object tracking each application-level reference to the root RemoteCache object being tracked by the broker, and to have their __del__ methods be invoked.
This may be achievable via a weak value dictionary to track the root RemoteCache instances instead, but this implementation strategy predates the availability of weak references in Python.
| Returns | The new instance. (type: self.__class__) | |