Golang如何实现工厂方法模式封装对象创建_Golang Factory Method模式实践

type PaymentProcessor interface {
    Process(amount float64) error
}

type Alipay struct{}

func (a *Alipay) Process(amount float64) error {
    fmt.Printf("使用支付宝支付 %.2f 元\n", amount)
    return nil
}

type WeChatPay struct{}

func (w *WeChatPay) Process(amount float64) error {
    fmt.Printf("使用微信支付 %.2f 元\n", amount)
    return nil
}

func NewPaymentProcessor(typ string) PaymentProcessor {
    switch typ {
    case "alipay":
        return &Alipay{}
    case "wechat":
        return &WeChatPay{}
    default:
        panic("不支持的支付方式")
    }
}

processor := NewPaymentProcessor("alipay")
processor.Process(99.9)

var processors = make(map[string]func() PaymentProcessor)

func Register(name string, creator func() PaymentProcessor) {
    processors[name] = creator
}

func CreatePaymentProcessor(name string) PaymentProcessor {
    creator, exists := processors[name]
    if !exists {
        panic("未知的支付处理器: " + name)
    }
    return creator()
}

func init() {
    Register("alipay", func() PaymentProcessor { return &Alipay{} })
    Register("wechat", func() PaymentProcessor { return &WeChatPay{} })
}

processor := CreatePaymentProcessor("alipay")
processor.Process(100)