July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
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34.14. Pattern: Cache Management
It is desirable to maintain materialized objects in a local cache to improve performance (materialization is relatively slow) and support transaction management operations such as a commit.
The Cache Management pattern [BW96] proposes making the Database Mappers responsible for maintaining its cache. If a different mapper is used for each class of persistent object, each mapper can maintain its own cache.
When objects are materialized, they are placed in the cache, with their OID as the key. Subsequent requests to the mapper for an object will cause the mapper to first search the cache, thus avoiding unnecessary materialization.
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