Architecture of complex web applications. Second Edition.
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Architecture of complex web applications. Second Edition.

With examples in Laravel(PHP)

About the Book

I have seen many projects that grew out of a simple "MVC" structure. Developers often explain the MVC pattern: "View is HTML templates, Model is an Active Record class (like Eloquent), and one controller to rule them all!”. Well, not just one, but all additional logic is usually implemented in controller classes. Controllers often contain a lot of code that implements various logic: image uploads, external API calls, database operations, etc. Sometimes some logic is extracted into "base" controllers to reduce code duplication, but they grow into thousands of lines. The same problems arise in both medium-sized projects and large portals with millions of daily visitors. In this book, I will show the most common problems that appear during the growth of a project and how developers usually solve them.

About the Author

Adel F
Adel F

Software developer with 20+ years of experience. "Laravel Idea" plugin creator.

Table of Contents

  • Preface
  • Bad habits
    • Growth issues
    • Extraction the logic
    • The “simplicity” of REST
    • PHP dark magic
    • “Rapid” application development
    • Premature optimization
    • Saving LOC
    • Other sources of pain
  • Dependency Injection
    • Single Responsibility Principle
    • Dependency Injection
    • Inheritance
    • Example with image uploading
    • Extending interfaces
    • Traits
    • Static methods
    • A few words at the end of the chapter
  • Painless refactoring
    • “Static” typing
    • Templates
    • Model fields
    • Laravel Idea
  • Application Layer
    • Passing request data
    • Working with database
    • Service classes or command classes?
    • A few words at the end of the chapter
  • Error handling
    • Exceptions
    • Base exception class
    • Global handler
    • Checked and unchecked exceptions
    • A few words at the end of the chapter
  • Validation
    • Database-related validation
    • Two levels of validation
    • Validation with attributes
    • Value objects
    • Value object as a composition of values
    • Value objects and validation
    • A few words at the end of the chapter
  • Events
    • Database transactions
    • Queues
    • Events
    • Using Eloquent events
    • Entities as event class fields
    • A few words at the end of the chapter
  • Unit testing
    • First steps
    • Testing stateful classes
    • Testing classes with dependencies
    • Types of software testing
    • Testing in Laravel
    • Application layer unit testing
    • Application testing strategy
  • Domain Layer
    • When and why?
    • Domain layer implementation
    • Handling errors in the Domain layer
    • A few words at the end of the chapter
  • CQRS
    • Different nature of data reading and writing
    • A typical service class
    • Command Query Responsibility Segregation
    • A few words at the end of the chapter
  • Event sourcing
    • The game of kings
    • Unit-testing entities
    • A world without magic
    • Implementing ES
    • A few words at the end of the chapter
  • Conclusion
    • Classics
    • Unit testing
    • DDD
    • ES and CQRS

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