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Home > 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

Standardized Service Contract, Service Loose Coupling

Architecture

Service

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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

Increased Intrinsic Interoperability, Reduced IT Burden

This page contains excerpts from:

SOA Design Patterns by Thomas Erl

Foreword by Grady Booch

With contributions from David Chappell, Jason Hogg, Anish Karmarkar, Mark Little, David Orchard, Satadru Roy, Thomas Rischbeck, Arnaud Simon, Clemens Utschig, Dennis Wisnosky, and others.

(ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages)

For more information about this book, visit www.servicetechbooks.com.

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

Foreword by David Chappell

With contributions from David Chappell, Jason Hogg, Anish Karmarkar, Mark Little, David Orchard, Satadru Roy, Thomas Rischbeck, Arnaud Simon, Clemens Utschig, Dennis Wisnosky, and others.

For more information about this book, visit www.servicetechbooks.com.