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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34.8. Pattern: Object Identifier
It is desirable to have a consistent way to relate objects to records, and to be able to ensure that repeated materialization of a record does not result in duplicate objects.
The Object Identifier pattern [BW96] proposes assigning an object identifier (OID) to each record and object (or proxy of an object).
An OID is usually an alphanumeric value; each is unique to a specific object. There are various approaches to generating unique IDs for OIDs, ranging from unique to one database, to globally unique: database sequence generators, the High-Low key generation strategy [Ambler00], and others.
Within object land, an OID is represented by an OID interface or class that encapsulates the actual value and its representation. ...
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