[top] / persistent / interfaces / IPersistentDataManager
Provide services for managing persistent state.
This interface is used by a persistent object to interact with its data manager in the context of a transaction.
There are no attributes or fields specified.
oldstate(obj, tid)
Return copy of obj
that was written by transaction tid
.
The returned object does not have the typical metadata (_p_jar, _p_oid, _p_serial) set. I'm not sure how references to other peristent objects are handled.
Parameters obj: a persistent object from this Connection. tid: id of a transaction that wrote an earlier revision.
Raises KeyError if tid does not exist or if tid deleted a revision of obj.
register(object)
Register an IPersistent with the current transaction.
This method must be called when the object transitions to the changed state.
A subclass could override this method to customize the default policy of one transaction manager for each thread.
setstate(object)
Load the state for the given object.
The object should be in the ghost state. The object's state will be set and the object will end up in the saved state.
The object must provide the IPersistent interface.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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