Golang Facadeモデルを活用した事業開発効率向上手法

package main

import "fmt"

type Product struct {
    ID         int
    Name       string
    Price      float64
    StockCount int
}

type Order struct {
    ID       int
    Products []Product
    Total    float64
}

type User struct {
    ID      int
    Name    string
    Address string
}

type ProductManager struct {
    products []Product
}

func (p *ProductManager) AddProduct(product Product) {
    p.products = append(p.products, product)
    fmt.Println("Product added:", product.Name)
}

func (p *ProductManager) GetProductCount() int {
    return len(p.products)
}

type OrderManager struct {
    orders []Order
}

func (o *OrderManager) PlaceOrder(order Order) {
    o.orders = append(o.orders, order)
    fmt.Println("Order placed:", order.ID)
}

func (o *OrderManager) GetOrderCount() int {
    return len(o.orders)
}

type UserManager struct {
    users []User
}

func (u *UserManager) AddUser(user User) {
    u.users = append(u.users, user)
    fmt.Println("User added:", user.Name)
}

func (u *UserManager) GetUserCount() int {
    return len(u.users)
}

type Facade struct {
    productManager *ProductManager
    orderManager   *OrderManager
    userManager    *UserManager
}

func (f *Facade) AddProduct(product Product) {
    f.productManager.AddProduct(product)
}

func (f *Facade) GetProductCount() int {
    return f.productManager.GetProductCount()
}

func (f *Facade) PlaceOrder(order Order) {
    f.orderManager.PlaceOrder(order)
}

func (f *Facade) GetOrderCount() int {
    return f.orderManager.GetOrderCount()
}

func (f *Facade) AddUser(user User) {
    f.userManager.AddUser(user)
}

func (f *Facade) GetUserCount() int {
    return f.userManager.GetUserCount()
}

func main() {
    facade := &Facade{
        productManager: &ProductManager{},
        orderManager:   &OrderManager{},
        userManager:    &UserManager{},
    }

    facade.AddProduct(Product{
        ID:         1,
        Name:       "iPhone",
        Price:      999.99,
        StockCount: 10,
    })

    facade.AddUser(User{
        ID:      1,
        Name:    "John",
        Address: "123 Main St",
    })

    fmt.Println("Product count:", facade.GetProductCount())
    fmt.Println("User count:", facade.GetUserCount())
    fmt.Println("Order count:", facade.GetOrderCount())
}