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Stateful Services (Erl)


Home > Inventory Implementataion Patterns > Stateful Services
How can service state data be persisted and managed without consuming service runtime resources?  

Problem

State data associated with a particular service activity can impose a great deal of runtime state management responsibility upon service compositions, thereby
reducing their scalability.

Solution

State data is managed and stored by intentionally stateful utility services.

Application

Stateful utility services provide in-memory state data storage and/or can maintain service activity context data.
Impacts

If not properly implemented, stateful
utility services can become a
performance bottleneck.

Principles

Service Statelessnes

Architecture

Inventory, Service




With the use of stateful utility services, state management responsibilities are deferred.


Related Patterns in This Catalog

Logic Centralization (Erl), Message Metadata (Erl), Partial State Deferral (Erl), Service Grid (Chappell), Service Messaging (Erl), State Messaging (Karmarkar), State Repository (Erl), Utility Abstraction (Erl)


Related Patterns in Other Catalogs

Server Session State (Fowler)


Related Service-Oriented Computing Goals

Increased Intrinsic Interoperability, Increased ROI, 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
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