如房屋中介，买、卖双方通过中介进行交互

package main


// 如房屋中介
// 买、卖双方通过中介进行交互
// 示例中   Ted 通过中介 与 Bill 问询房屋价格


import "fmt"


type Mediator interface {
    Communicate(who string)
}


type WildStallion interface {
    SetMediator(mediator Mediator)
}


type Bill struct {
    mediator Mediator
}


func (b *Bill) SetMediator(mediator Mediator) {
    b.mediator = mediator
}


func (b *Bill) Respond() {
    fmt.Println("Bill: what?")
    b.mediator.Communicate("bill")
}


type Ted struct {
    mediator Mediator
}


func (t *Ted) Talk() {
    fmt.Println("Ted: Bill?")
    t.mediator.Communicate("Ted")
}


func (b *Ted) SetMediator(mediator Mediator) {
    b.mediator = mediator
}


func (t *Ted) Respond() {
    fmt.Println("Ted: how much?")
}


type Concretemediator struct {
    Bill
    Ted
}


func (m *Concretemediator) Communicate(who string) {
    if who == "Ted" {
        m.Bill.Respond()
        return
    }


    m.Ted.Respond()
}


func NewMediator() *Concretemediator {
    m := &Concretemediator{}
    m.Bill.SetMediator(m)
    m.Ted.SetMediator(m)

    return m
}


func main() {
    m := NewMediator()
    m.Ted.Talk()

}