zope.bforest-1.2-2.lbn19.noarch

BForests are dictionary-like objects that use multiple BTrees for a backend and support rotation of the composite trees. This supports various implementations of timed member expirations, enabling caches and semi-persistent storage. A useful and simple subclass would be to promote a key-value pair to the first (newest) bucket whenever the key is accessed, for instance. It also is useful with disabling the rotation capability.

Like btrees, bforests come in four flavors: Integer-Integer (IIBForest), Integer-Object (IOBForest), Object-Integer (OIBForest), and Object-Object (OOBForest). The examples here will deal with them in the abstract: we will create classes from the imaginary and representative BForest class, and generate keys from KeyGenerator and values from ValueGenerator. From the examples you should be able to extrapolate usage of all four types.