GlossaryΒΆ

activation
Moving an object from the GHOST state to the UPTODATE state, load its pickled data from its jar.
data manager
The object responsible for storing and loading an object’s pickled data in a backing store. Also called a jar.
deactivation
Moving an object from the UPTODATE state to the GHOST state, discarding its pickled data.
ghost
An object whose pickled data has not yet been loaded from its jar. Accessing or mutating any of its attributes causes that data to be loaded, which is referred to as activation.
invalidation
Moving an object from either the UPTODATE state or the CHANGED state to the GHOST state, discarding its pickled data.
jar
Alias for data manager: short for “pickle jar”, because it traditionally holds the pickled data of persistent objects.
object cache
An MRU cache for objects associated with a given data manager.
pickled data
The serialized data of a persistent object, stored in and retrieved from a backing store by a data manager.
volatile attribute
Attributes of a persistent object which are not caputured as part of its pickled data. These attributes thus disappear during deactivation or invalidation.