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Home > Design Patterns > Partial State Deferral

Partial State Deferral (Erl)

How can services be designed to optimize resource consumption while still remaining stateful?

Problem

Service capabilities may be required to store and manage large amounts of state data, resulting in increased memory consumption and reduced scalability.

Solution

Even when services are required to remain stateful, a subset of their state data can be temporarily deferred.

Application

Various state management deferral options exist, depending on the surrounding architecture.

Impacts

Partial state management deferral can add to design complexity and bind a service to the architecture.

Principles

Service Statelessness

Architecture

Inventory, Service

Partial State Deferral: Applying this pattern results in the same amount of concurrent service instances but less overall state-related memory consumption.

Applying this pattern results in the same amount of concurrent service instances but less overall state-related memory consumption.

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.