ddd-springboot-kata

This repo is to leverage spring boot sample project to refactor to ddd tactical design, way to point out the key steps in implementing function codes from test.

Architecture design follow Onion Architecture

At beginning, we defined the layered architecture for separating responsibility, in order to better guide new-comers to know each layer's responsibility and mapping classic clean-architecture layers, design conventions, and DDD tactical design patterns, the following layers explained detail:

folders under Bounded Context name -

Anti-corruption Layer as translator in each layer

From traditional design, there is always a database-table-like entity pass through-out to client, it leads to huge impact when modifying entities then each layer updates is a need.

In order to well protect inner layers object not being impacted, when receiving external layer pass-in argument objects, translate it into inner layer objects for further instructions.

Models

AggregateRoot
Aggregate
Entity
Value Object
Interfaces
Repository (interface only)
Services

Infrastructure

Data access implementation
Migrations
Cache
Logging
All the infra-specific services

Interfaces (User Interface)

Controllers
Views
ViewModels
GUI project

Configurations (aka.Framework and Drivers)

Framework configurations
Database Driver configurations
Middleware settings

DDD Patterns

(In Spring boot framework, all of these configurations could be place here)

Kata objectives

This kata guide DDD practitioners to refactor legacy code into Clean Architecture design, and by adding tests to make sure all of these modifications still satisfied business requirements.

1 - Add test for inquiry all tutorials

2 - Extract I/O object types to DTO

3 - Add test for creating tutorial

How to run sample app

There are a few default sample data loaded while starting application, spring boot will load data from /resources/data.sql :

insert into tutorials values (1,'test1','yes','kimtest');
insert into tutorials values (2,'test2','yes','fongtest');
insert into tutorials values (3,'test3','yes','arthurtest');
insert into tutorials values (4,'test4','yes','rivertest');

To start the sample app, you need to build first and run :

cd $sourceCodeFolder/

//check there is a build.gradle file in current folder, then : 

gradle build

gradle bootRun

To check the data insertions runs well, just open browser and visit :

http://localhost:8080/h2-ui

modify the jdbc url to :

jdbc:h2:mem:testdb

then login :D

Test application by simplify using curl command :

curl http://localhost:8080/api/tutorials | jq '.'

Sample data output

[
  {
    "id": 1,
    "title": "kimtest",
    "description": "test1",
    "published": true
  },
  {
    "id": 2,
    "title": "fongtest",
    "description": "test2",
    "published": true
  },
  {
    "id": 3,
    "title": "arthurtest",
    "description": "test3",
    "published": true
  },
  {
    "id": 4,
    "title": "rivertest",
    "description": "test4",
    "published": true
  }
]