Aggregates are all about persistence and transactions. In fact, you can't design Aggregates without thinking about how they're going to be persisted. The basic rules to design proper Aggregates are: make them small, find true business invariants, push for eventual consistency using Domain Events, reference other Aggregates by Identity, and modify one Aggregate per request. Review how the code changes if two Entities form a single Aggregate or not. Use factories to enrich your Entities. Finally, relax. In most of the PHP applications we've seen, only five percent of the Entities were Aggregates formed by two Entities or more. Discuss with your workmates when designing and implementing Aggregates.
Domain-Driven Design in PHP
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Domain-Driven Design in PHP
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Overview of this book
Domain-Driven Design (DDD) has arrived in the PHP community, but for all the talk, there is very little real code. Without being in a training session and with no PHP real examples, learning DDD can be challenging. This book changes all that. It details how to implement tactical DDD patterns and gives full examples of topics such as integrating Bounded Contexts with REST, and DDD messaging strategies. In this book, the authors show you, with tons of details and examples, how to properly design Entities, Value Objects, Services, Domain Events, Aggregates, Factories, Repositories, Services, and Application Services with PHP. They show how to apply Hexagonal Architecture within your application whether you use an open source framework or your own.
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Current Title:
Domain-Driven Design in PHP
Table of Contents (24 chapters)
Title Page
Credits
Foreword
About the Authors
Acknowledgments
www.PacktPub.com
Customer Feedback
Dedication
Preface
Free Chapter
Getting Started with Domain-Driven Design
Architectural Styles
Value Objects
Entities
Services
Domain-Events
Modules
Aggregates
Repositories
Application
Integrating Bounded Contexts
Hexagonal Architecture with PHP
Bibliography
The End
Customer Reviews