🐘🎯 Hexagonal Architecture, DDD & CQRS in PHP

Librarify is a PHP application using Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) principles keeping the code as simple as possible.

🚀 Environment Setup

🐳 Needed tools

1. Install Docker
2. Clone this project: git clone https://github.com/serodas/librarify-php-ddd.git
3. Move to the project folder: cd librarify-php-ddd

🛠️ Environment configuration

1. Create a local environment file (cp .env .env.local) if you want to modify any parameter

🔥 Application execution

1. Install all the dependencies and bring up the project with Docker executing: make build
2. Then you'll have 2 apps available (2 APIs):
   1. Librarify Backend: http://localhost:8030/health-check
   2. Backoffice Backend: http://localhost:8040/health-check

✅ Tests execution

1. Install the dependencies if you haven't done it previously: make deps
2. Execute PHPUnit and Behat tests: make test

👩‍💻 Project explanation

This project tries to be a library platform. It's decoupled from any framework, but it has some Symfony implementation.

⛱️ Bounded Contexts

• Librarify: Place to look in if you wanna see some code 🙂. Library platform with books, authors, categories, and so on.

• Backoffice: Here you will find a projection of books stored in Elasticsearch.

🎯 Hexagonal Architecture

This repository follows the Hexagonal Architecture pattern. Also, it's structured using modules. With this, we can see that the current structure of a Bounded Context is:

$ tree -L 4 src

src
|-- Librarify // Company subdomain / Bounded Context: Features related to one of the company business lines / products
|   `-- Books // Some Module inside the Librarify context
|       |-- Application
|       |   |-- Create // Inside the application layer all is structured by actions
|       |   |   |-- BookCreator.php
|       |   |   |-- CreateBookCommand.php
|       |   |   `-- CreateBookCommandHandler.php
|       |   `-- Find
|       |-- Domain
|       |   |-- Book.php // The Aggregate of the Module
|       |   |-- BookCreatedDomainEvent.php // A Domain Event
|       |   |-- BookDescription.php
|       |   |-- BookNotFound.php
|       |   |-- BookRepository.php // The `Interface` of the repository is inside Domain
|       |   |-- BookScore.php
|       |   `-- BookTitle.php
|       `-- Infrastructure // The infrastructure of our module
|           |-- DependencyInjection
|           `-- Persistence
|               `--DoctrineBookRepository.php // An implementation of the repository
`-- Shared // Shared Kernel: Common infrastructure and domain shared between the different Bounded Contexts
    |-- Domain
    `-- Infrastructure

Repository pattern

Our repositories try to be as simple as possible usually only containing 2 methods search and save. If we need some query with more filters we use the Specification pattern also known as Criteria pattern. So we add a searchByCriteria method.

Command Bus

There is 1 implementations of the command bus.

1. Sync using the Symfony Message Bus

Query Bus

The Query Bus uses the Symfony Message Bus.

Event Bus

The Event Bus uses the Symfony Message Bus. The MySql Bus uses a MySql+Pulling as a bus. The RabbitMQ Bus uses RabbitMQ C extension.

• Rabbit Management: :8090

Reference

Based on course DDD in PHP by CodelyTV