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Force.com Enterprise Architecture

You're reading from   Force.com Enterprise Architecture Blend industry best practices to architect and deliver packaged Force.com applications that cater to enterprise business needs

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Product type Paperback
Published in Sep 2014
Publisher
ISBN-13 9781782172994
Length 402 pages
Edition 1st Edition
Languages
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Author (1):
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Andrew Fawcett Andrew Fawcett
Author Profile Icon Andrew Fawcett
Andrew Fawcett
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Toc

Table of Contents (13) Chapters Close

Preface 1. Building, Publishing, and Supporting Your Application FREE CHAPTER 2. Leveraging Platform Features 3. Application Storage 4. Apex Execution and Separation of Concerns 5. Application Service Layer 6. Application Domain Layer 7. Application Selector Layer 8. User Interface 9. Providing Integration and Extensibility 10. Asynchronous Processing and Big Data Volumes 11. Source Control and Continuous Integration Index

Introducing the Service layer pattern

The following is Martin Fowler's definition of the Service layer (http://martinfowler.com/eaaCatalog/serviceLayer.html):

"Defines an application's boundary with a layer of services that establishes a set of available operations and coordinates the application's response in each operation."

The use of the word "boundary" in Martin's definition is interesting, as this literally represents the point of separation or boundary between the concerns of the application's business logic in the Service layer and execution context or caller, be that a Visualforce Controller class or a Batch Apex class, as illustrated in the UML diagrams shown in the previous chapter.

The following illustration shows just some of the types of callers that an Apex Service layer is designed to support. By following the design guidelines given in the next diagram, you can ensure that your Service layer code can be called from any one of these...

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