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README.md

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English | 中文README

Overview

DDD Firework is a framework that supports the implementation of DDD (Domain-Driven Design). It provides a complete lifecycle wrapper for domain entities, including creation, modification, persistence, event sending, event listening, and integration with components such as locks, databases, and eventbuses.

Features

  1. Providing a unified application-level interface ICommand to encapsulate the entire lifecycle (build, behavior, persistence, event sending, etc.) management of domain layer entities.
  2. Automatic detection of changes to domain entities and persistence, without the need for users to handle complex storage logic.
  3. Support for rapid rebuild of complex aggregations (multiple levels of entity combinations), without the need to write specific query statements.
  4. Support for domain events, including domain event sending, registration of listener functions, and event callbacks.
  5. Hexagonal architecture with abstract definitions of each underlying component (locks, persistence, event buses, etc.) allows for flexible pluggable components.

Architecture

img.png

Usage

  1. Define domain entities

     import ddd "github.com/bytedance/dddfirework"
    
     type Order struct {
         ddd.BaseEntity
     
         UserID      string
         TotalAmount int64
         Remark      string
     }
    
  2. Register persistence models

     import ddd "github.com/bytedance/dddfirework"
     import "github.com/bytedance/dddfirework/executor/mysql"
     
     func init() {
         mysql.RegisterEntity2Model(&domain.Order{}, func(entity, parent ddd.IEntity, op ddd.OpType) (mysql.IModel, error) {
             do := entity.(*domain.Order)
             return &po.OrderPO{
                 ID:          do.GetID(),
                 User:        do.UserID,
                 TotalAmount: do.TotalAmount,
                 Remark:      do.Remark,
             }, nil
         }, func(m mysql.IModel, do ddd.IEntity) error {
             orderPO, order := m.(*po.OrderPO), do.(*domain.Order)
             order.UserID = orderPO.User
             order.TotalAmount = orderPO.TotalAmount
             order.Remark = orderPO.Remark
             return nil
         }
     }
    
  3. Define Command

     type UpdateOrderOpt struct {
         Remark *string
     }
     
     type UpdateOrderCommand struct {
         ddd.Command
     
         orderID string
         opt     UpdateOrderOpt
     }
     
     func NewUpdateOrderCommand(orderID string, opt UpdateOrderOpt) *UpdateOrderCommand {
         return &UpdateOrderCommand{
             orderID: orderID,
             opt:     opt,
         }
     }
     
     func (c *UpdateOrderCommand) Init(ctx context.Context) (lockIDs []string, err error) {
         return []string{c.orderID}, nil
     }
     
     func (c *UpdateOrderCommand) Build(ctx context.Context, builder dddfirework.DomainBuilder) (roots []dddfirework.IEntity, err error) {
         order := &domain.Order{
             ID:      id,
             Items:   []*domain.SaleItem{},
             Coupons: []*domain.Coupon{},
         }
         if err := builder.Build(ctx, order, &order.Items, &order.Coupons); err != nil {
             return nil, err
         }
         return []dddfirework.IEntity{order}, nil
     }
     
     func (c *UpdateOrderCommand) Act(ctx context.Context, container dddfirework.RootContainer, roots ...dddfirework.IEntity) error {
         order := roots[0].(*domain.Order)
         if c.opt.Remark != nil {
             order.Remark = *c.opt.Remark
             order.Dirty()
         }
     
         return nil
     }
    
  4. Execute command

     import (
         ddd "github.com/bytedance/dddfirework" 
         db_executor "github.com/bytedance/dddfirework/executor/mysql"
         db_eventbus "github.com/bytedance/dddfirework/eventbus/mysql"
         db_lock "github.com/bytedance/dddfirework/lock/db"
         "gorm.io/driver/mysql"
         "gorm.io/gorm"
     )
    
     func main() {
         lock := db_lock.NewDBLock(db, time.Second*10)
         executor := db_executor.NewExecutor(db)
         eventBus := db_eventbus.NewEventBus("svc_example", db)
         engine := dddfirework.NewEngine(lock, executor, eventBus.Options()...)
         engine.RunCommand(ctx, command.NewUpdateOrderCommand(
             req.ID, command.UpdateOrderOpt{Remark: req.Remark},
         ))
     }
    

More Example

ref: example/main.go