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Force.com Enterprise Architecture

You're reading from   Force.com Enterprise Architecture Architect and deliver packaged Force.com applications that cater to enterprise business needs

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781786463685
Length 504 pages
Edition 2nd 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 (15) 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. Lightning 10. Providing Integration and Extensibility 11. Asynchronous Processing and Big Data Volumes 12. Unit Testing 13. Source Control and Continuous Integration Index

Introducing the Selector layer pattern


The following is Martin Fowler's definition of the Data Mapper layer on which the Selector layer pattern is based (http://martinfowler.com/eaaCatalog/dataMapper.html):

"A layer of Mappers (473) that moves data between objects and a database while keeping them independent of each other and the Mapper itself."

In Martin's definition, he is referring to objects as those resulting from the instantiation of classes within an OO language such as Java or Apex. Of course, in the Force.com world, this has a slightly ambiguous meaning, but is more commonly thought of as the Standard or Custom Object holding the record data.

One of the great features of the Apex language is that it automatically injects object types into the language that mirror the definition of the Custom Objects you define. These so-called SObjects create a type-safe bond between the code and the database schema, though you can also leverage Dynamic Apex and Dynamic SOQL to change these references...

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