拡張性の高いシステムアーキテクチャの構築：Golang Facadeパターンの詳細解説

package main

import "fmt"

// 用户管理子系统
type UserSubSystem struct{}

func (u *UserSubSystem) Register(username, password string) {
    fmt.Printf("用户 %s 注册成功
", username)
}

func (u *UserSubSystem) Login(username, password string) {
    fmt.Printf("用户 %s 登录成功
", username)
}

// 订单管理子系统
type OrderSubSystem struct{}

func (o *OrderSubSystem) CreateOrder(orderID string) {
    fmt.Printf("订单 %s 创建成功
", orderID)
}

func (o *OrderSubSystem) QueryOrder(orderID string) {
    fmt.Printf("查询订单 %s
", orderID)
}

// 支付接口子系统
type PaymentSubSystem struct{}

func (p *PaymentSubSystem) Pay(orderID string, amount float64) {
    fmt.Printf("订单 %s 支付成功，支付金额：%f
", orderID, amount)
}

// Facade类
type PaymentFacade struct {
    UserSubSystem    *UserSubSystem
    OrderSubSystem   *OrderSubSystem
    PaymentSubSystem *PaymentSubSystem
}

func (f *PaymentFacade) Register(username, password string) {
    f.UserSubSystem.Register(username, password)
}

func (f *PaymentFacade) Login(username, password string) {
    f.UserSubSystem.Login(username, password)
}

func (f *PaymentFacade) CreateOrder(orderID string) {
    f.OrderSubSystem.CreateOrder(orderID)
}

func (f *PaymentFacade) QueryOrder(orderID string) {
    f.OrderSubSystem.QueryOrder(orderID)
}

func (f *PaymentFacade) Pay(orderID string, amount float64) {
    f.PaymentSubSystem.Pay(orderID, amount)
}

func main() {
    // 创建Facade对象
    paymentFacade := &PaymentFacade{
        UserSubSystem:    &UserSubSystem{},
        OrderSubSystem:   &OrderSubSystem{},
        PaymentSubSystem: &PaymentSubSystem{},
    }

    // 客户端通过Facade对象访问子系统
    paymentFacade.Register("user1", "password1")
    paymentFacade.Login("user1", "password1")
    paymentFacade.CreateOrder("order123")
    paymentFacade.QueryOrder("order123")
    paymentFacade.Pay("order123", 100.0)
}

用户 user1 注册成功
用户 user1 登录成功
订单 order123 创建成功
查询订单 order123
订单 order123 支付成功，支付金额：100.000000