外观模式

   外观模式：提供了一个统一的接口，用来访问子系统中的一群接口。外观定义了一个高层接口，让子系统更容易使用。——《HEAD FIRST 设计模式》

   我的golang代码：

package facade

import "fmt"

type PopcornPopper struct {
}

func (f *PopcornPopper) On() {
    fmt.Println("popper on!")
}

func (f *PopcornPopper) Off() {
    fmt.Println("popper off!")
}

func (f *PopcornPopper) Pop() {
    fmt.Println("popper pop!")
}

type TheaterLights struct {
}

func (f *TheaterLights) Dim() {
    fmt.Println("theaterlights dim!")
}

func (f *TheaterLights) On() {
    fmt.Println("theaterlights on!")
}

type Screen struct {
}

func (f *Screen) Down() {
    fmt.Println("screen down!")
}

func (f *Screen) Up() {
    fmt.Println("screen up!")
}

type Projector struct {
}

func (f *Projector) On() {
    fmt.Println("projector on!")
}

func (f *Projector) Off() {
    fmt.Println("projector off!")
}

func (f *Projector) WideScreenMode() {
    fmt.Println("projector widescreenmode!")
}

type Amplifier struct {
}

func (f *Amplifier) On() {
    fmt.Println("amplifier on!")
}

func (f *Amplifier) Off() {
    fmt.Println("amplifier off!")
}

func (f *Amplifier) SetDvd() {
    fmt.Println("amplifier setdvd!")
}

func (f *Amplifier) SetSurroundSound() {
    fmt.Println("amplifier setsurroundsound!")
}

func (f *Amplifier) SetVolume() {
    fmt.Println("amplifier setvolume!")
}

type DvdPlayer struct {
}

func (f *DvdPlayer) On() {
    fmt.Println("dvd on!")
}

func (f *DvdPlayer) Play() {
    fmt.Println("dvd play!")
}

func (f *DvdPlayer) Stop() {
    fmt.Println("dvd stop!")
}

func (f *DvdPlayer) Eject() {
    fmt.Println("dvd eject!")
}

func (f *DvdPlayer) Off() {
    fmt.Println("dvd off!")
}

type HomeTheaterFacade struct {
    amp       Amplifier
    dvd       DvdPlayer
    projector Projector
    light     TheaterLights
    screen    Screen
    popper    PopcornPopper
}

func NewHomeTheaterFacade(a Amplifier, d DvdPlayer, p Projector, l TheaterLights, s Screen, po PopcornPopper) *HomeTheaterFacade {
    r := new(HomeTheaterFacade)
    r.amp = a
    r.dvd = d
    r.projector = p
    r.light = l
    r.screen = s
    r.popper = po

    return r
}

func (f *HomeTheaterFacade) WatchMovie() {
    fmt.Println("watch movie!")
    f.popper.On()
    f.popper.Pop()
    f.light.Dim()
    f.screen.Down()
    f.projector.On()
    f.projector.WideScreenMode()
    f.amp.On()
    f.amp.SetDvd()
    f.amp.SetSurroundSound()
    f.amp.SetVolume()
    f.dvd.On()
    f.dvd.Play()
}

func (f *HomeTheaterFacade) EndMovie() {
    fmt.Println("end movie!")
    f.popper.Off()
    f.light.On()
    f.screen.Up()
    f.projector.Off()
    f.amp.Off()
    f.dvd.Stop()
    f.dvd.Eject()
    f.dvd.Off()
}

   个人感悟：待留。