SOA Patterns > Service Messaging Patterns > Messaging Metadata
Messaging Metadata (Erl)
How can services be designed to process activity-specific data at runtime?
Problem
Because messaging does not rely on a persistent connection between service and consumer, it is challenging for a service to gain access to the state data associated with an overall runtime activity.
Solution
Message contents can be supplemented with activity-specific metadata that can be interpreted and processed separately at runtime.
Application
This pattern requires a messaging framework that supports message headers or properties.
Impacts
The interpretation and processing of messaging metadata adds to runtime performance overhead and increases service activity design complexity.
Principles
Architecture
Composition
Messages equipped with metadata reduce the requirements for services to contain embedded, activityspecific solution logic.
Related Patterns in This Catalog
Asynchronous Queuing, Atomic Service Transaction, Canonical Protocol, Compensating Service Transaction, Data Confidentiality, Data Origin Authentication, Intermediate Routing, Reliable Messaging, Rules Centralization, Service Agent, Service Callback, Service Grid, Service Instance Routing, Service Messaging, State Messaging, Stateful Services
Related Service-Oriented Computing Goals
This pattern is covered in SOACP Module 7: Advanced SOA Design & Architecture with Services & Microservices.
For more information regarding the SOA Certified Pofessional (SOACP) curriculum,
visit www.arcitura.com/soa.
This page contains excerpts from:
SOA Design Patterns by Thomas Erl
(ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages)
For more information about this book, visit www.arcitura.com/books.
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
For more information about this book, visit www.arcitura.com/books.