SOA Patterns | Design Patterns | Service Layers

SOA Patterns > Foundational Inventory Patterns > Service Layers
Home > Design Patterns > Service Layers

Service Layers (Erl)

How can the services in an inventory be organized based on functional commonality?

Service Layers


Arbitrarily defining services delivered and governed by different project teams can lead to design inconsistency and inadvertent functional redundancy across a service inventory.


The inventory is structured into two or more logical service layers, each of which is responsible for abstracting logic based on a common functional type.


Service models are chosen and then form the basis for service layers that establish modeling and design standards.  See the Service Models and Layers page for more details.


The common costs and impacts associated with design standards and up-front analysis need to be accepted.


Inventory, Service

Related services are designed according to service models, thereby establishing logical service layers. In this case, the service inventory is structured with three service layers that correspond to the three abstraction patterns described in Chapter 7. (Note the pipe symbol is used to represent a service layer in this book.) SOA Certified Professional (SOACP) Module 4: Fundamental SOA Analysis & Modeling with Services & Microservices

This pattern is covered in SOACP Module 4: Fundamental SOA Analysis & Modeling with Services & Microservices.

For more information regarding the SOA Certified Pofessional (SOACP) curriculum,

SOA Design Patterns

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