type Observer interface {

    Update(message string)

}

type Subject interface {

    Register(Observer)

    Deregister(Observer)

    Notify(message string)

}

type EventNotifier struct {

    observers []Observer

}

func (e *EventNotifier) Register(o Observer) {

    e.observers = append(e.observers, o)

}

func (e *EventNotifier) Deregister(o Observer) {

    for i, obs := range e.observers {

        if obs == o {

            e.observers = append(e.observers[:i], e.observers[i+1:]...)

            break

        }

    }

}

func (e *EventNotifier) Notify(message string) {

    for _, observer := range e.observers {

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        observer.Update(message)

    }

}

type Logger struct{}

func (l *Logger) Update(msg string) {

    fmt.Println("日志记录:", msg)

}

type Emailer struct{}

func (e *Emailer) Update(msg string) {

    fmt.Println("发送邮件:", msg)

}

notifier := &EventNotifier{}

logger := &Logger{}

emailer := &Emailer{}

notifier.Register(logger)

notifier.Register(emailer)

notifier.Notify("系统发生异常")

日志记录: 系统发生异常

发送邮件: 系统发生异常