Go设计模式9：外观模式（Facade Pattern）的应用

package main

import "fmt"

// Subsystem 1
type AudioMixer struct{}

func (a *AudioMixer) Fix(result string) string {
  return fmt.Sprintf("%s (audio fixed)", result)
}

// Subsystem 2
type VideoMixer struct{}

func (v *VideoMixer) Fix(result string) string {
  return fmt.Sprintf("%s (video fixed)", result)
}

// Facade
type MediaMixer struct {
  audio *AudioMixer
  video *VideoMixer
}

func NewMediaMixer() *MediaMixer {
  return &MediaMixer{
    audio: &AudioMixer{},
    video: &VideoMixer{},
  }
}

func (m *MediaMixer) FixAudioAndVideo(result string) string {
  result = m.audio.Fix(result)
  result = m.video.Fix(result)
  return result
}

func main() {
  mixer := NewMediaMixer()
  result := mixer.FixAudioAndVideo("media")
  fmt.Println(result)
}