Glossary
- 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.