设计模式 mediator 实现
golang 设计模式 mediator 代码实现
package mediator
import (
"fmt"
"strings"
)
type CDDriver struct {
Data string
}
func (c *CDDriver) ReadData() {
c.Data = "music,image"
fmt.Printf("CDDriver: reading data %s\n", c.Data)
GetMediatorInstance().changed(c)
}
type CPU struct {
Video string
Sound string
}
func (c *CPU) Process(data string) {
sp := strings.Split(data, ",")
c.Sound = sp[0]
c.Video = sp[1]
fmt.Printf("CPU: split data with Sound %s, Video %s\n", c.Sound, c.Video)
GetMediatorInstance().changed(c)
}
type VideoCard struct {
Data string
}
func (v *VideoCard) Display(data string) {
v.Data = data
fmt.Printf("VideoCard: display %s\n", v.Data)
GetMediatorInstance().changed(v)
}
type SoundCard struct {
Data string
}
func (s *SoundCard) Play(data string) {
s.Data = data
fmt.Printf("SoundCard: play %s\n", s.Data)
GetMediatorInstance().changed(s)
}
type Mediator struct {
CD *CDDriver
CPU *CPU
Video *VideoCard
Sound *SoundCard
}
var mediator *Mediator
func GetMediatorInstance() *Mediator {
if mediator == nil {
mediator = &Mediator{}
}
return mediator
}
func (m *Mediator) changed(i interface{}) {
switch inst := i.(type) {
case *CDDriver:
m.CPU.Process(inst.Data)
case *CPU:
m.Sound.Play(inst.Sound)
m.Video.Display(inst.Video)
}
}
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