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Home > Design Patterns > Policy Centralization

Policy Centralization (Erl)

How can policies be normalized and consistently enforced across multiple services?

Problem

Policies that apply to multiple services can introduce redundancy and inconsistency within service logic and contracts.

Solution

Global or domain-specific policies can be isolated and applied to multiple services.

Application

Up-front analysis effort specific to defining and establishing reusable policies is recommended, and an appropriate policy enforcement framework is required.

Impacts

Policy frameworks can introduce performance overhead and may impose dependencies on proprietary technologies. There is also the risk of conflict between centralized and service-specific policies.

Principles

Standardized Service Contract, Service Loose Coupling, Service Abstraction

Architecture

Inventory, Service

Listen to the podcasts that accompany this site
Basic WS-Policy
Advanced WS-Policy

Policy Centralization: A global policy definition (Corporate Policy.xml) is established and applies to all WSDL documents, and a further domain policy (Claims Policy.xml) is created and linked to two WSDL definitions. This new policy structure eliminates redundancy of policy content and ensures consistent policy enforcement.

A global policy definition (Corporate Policy.xml) is established and applies to all WSDL documents, and a further domain policy (Claims Policy.xml) is created and linked to two WSDL definitions. This new policy structure eliminates redundancy of policy content and ensures consistent policy enforcement.

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