Return to Home Page
Overview
    History
    Acknowledgements
    Podcasts
    Notification Form
    Feedback Form
    Press Release #1
    Press Release #2
    Press Release #3

Master SOA Design
Pattern Catalog
    Master Pattern List (alphabetical)
    Master Pattern List (by category)
    Master Pattern List (Text)
    Pattern Notation
    Pattern Profiles
    Symbol Legend
    Pattern Contribution Form

SOA Candidate Patterns
    SOA Patterns Review Committee
    Candidate Patterns Overview
    Candidate Patterns List
    Candidate Pattern Contribution Form
    Candidate Pattern
Feedback Form
    SOA Pattern Template

Design Pattern Basics
    What's a Design Pattern?
    What's a Design Pattern Language?
    What's a Compound Pattern?

Supplemental
    SOA Patterns and Application Technologies
    SOA Design Patterns Historical Influences
    SOA Design Patterns and Design Principles
    SOA Design Patterns and Design Granularity
    Legal

Resources
    Design Patterns Publications
    Reference Posters
    SOAPrinciples.com
    WhatIsSOA.com
    SOA Visio Stencil


Capability Composition (Erl)


Home > Capability Composition Patterns > Capability Composition
How can a service capability solve a problem that requires logic outside
of the service boundary? 		 

Problem

A capability may not be able to fulfill its processing requirements without adding logic that resides outside of its serviceˇ¦s functional context, thereby compromising the integrity of the service context and risking service denormalization.

Solution

When requiring access to logic that falls outside of a serviceˇ¦s boundary, capability logic within the service is designed to compose one or more capabilities in other services.

Application

The functionality encapsulated by a capability includes logic that can invoke other capabilities from other services.
Impacts

Carrying out composition logic requires external invocation, which adds performance overhead and decreases service autonomy.

Principles

Standardized Service Contract, Service Loose Coupling, Service Abstraction, Service Reusability, Service Autonomy, Service Statelessnes, Service Discoverability, Service Composability
Architecture

Inventory, Composition, Service




The individual capabilities of services can be aggregated to collectively help solve the large problem from which they were originally derived.


Related Patterns in This Catalog

Agnostic Capability (Erl), Capability Recomposition (Erl), Logic Centralization (Erl), Non Agnostic Context (Erl), Process Abstraction (Erl), Process Centralization (Erl), Service Normalization (Erl)


Related Patterns in Other Catalogs

Composite (Gamma, Helm, Johnson, Vlissides)


Related Service-Oriented Computing Goals

Increased Intrinsic Interoperability, Reduced IT Burden

SOA Design Patterns 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.soabooks.com.
The Prentice Hall Service-Oriented Computing Series from Thomas Erl
Home    SOA Books    SOA Magazine    What is SOA?    SOA Principles    SOASchool.com    SOA Glossary Copyright © 2007-2009
SOA Systems Inc.