依存性注入(Golang)

package main

import (
	"fmt"
)

func main() {
    lightOne := new(Incandescent) 	// only change these lines if new lighting is introduced
    lightTwo := new(LedLight)		//

    myRoom := NewRoom(lightOne, lightTwo) // DI or object Injection

    myRoom.SwitchOnOne()
    myRoom.SwitchOnTwo()
}

type LightSocket interface {
    LightUp() string
}

// room has two sokets
type Room struct {
    LightOne LightSocket		// prepare only socket, not bulb
    LightTwo LightSocket
}

// define switch on method of the two sockets
func (r *Room) SwitchOnOne() {
    fmt.Println("1番照明:", r.LightOne.LightUp())
}
func (r *Room) SwitchOnTwo() {
    fmt.Println("2番照明:", r.LightTwo.LightUp())
}

// Constructor Injection
func NewRoom(lightOne, lightTwo LightSocket) *Room {
    room := &Room{
        LightOne: lightOne,
        LightTwo: lightTwo,
    }
    return room
}

// Led light
type LedLight struct{}

func (*LedLight) LightUp() string {
    return "LEDが光るよ!"
}

// Filament bulb
type Incandescent struct{}

func (*Incandescent) LightUp() string {
    return "フィラメントが光るよ!"
}