SOA Patterns > Service Contract Design Patterns > Contract Denormalization
Contract Denormalization (Erl)
How can a service contract facilitate consumer programs with differing data exchange requirements?
Problem
Services with strictly normalized contracts can impose unnecessary functional and performace demands on some consumer programs.
Solution
Service contracts can include a measured extent of denormalization, allowing multiple capabilities to redundantly express core functions in different ways for different types of consumer programs.
Application
The service contract is carefully extended with additional capabilities that provide functional variations of a primary capability.
Impacts
Overuse of this pattern on the same contract can dramatically increase its size, making it difficult to interpret and unwieldy to govern.
Principles
Architecture
Service
Equipped with additional (albeit redundant) capabilities, the Invoice service is able to better accommodate the individual requirements of the three consumers.
Related Patterns in This Catalog
Canonical Expression, Compensating Service Transaction, Concurrent Contracts, Decomposed Capability, Decoupled Contract, Proxy Capability, Service Façade, Service Normalization
Related Service-Oriented Computing Goals
This pattern is covered in SOACP Module 4: Fundamental SOA Analysis & Modeling with Services & Microservices.
For more information regarding the SOA Certified Pofessional (SOACP) curriculum,
visit www.arcitura.com/soa.
This page contains excerpts from:
SOA Design Patterns by Thomas Erl
(ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages)
For more information about this book, visit www.arcitura.com/books.
This page contains excerpts from:
Web Service Contract Design and Versioning for SOA
by Thomas Erl, Anish Karmarkar, Priscilla Walmsley, Hugo Haas, Umit Yalcinalp, Canyang Kevin Liu, David Orchard, Andre Tost, James Pasley
For more information about this book, visit www.arcitura.com/books.