gistfile1.txt

package main

import (
  "fmt"
  "time"
)


type Client struct {
  name string
}

func barber() chan <- Client {
  clients := make(chan Client, 1)
  go func() {
    for client := range clients {
      fmt.Printf("Cliente %q sendo cortado\n", client.name)
      time.Sleep(1)
      fmt.Printf("Cliente %q satisfeito\n", client.name)
    }
  }()
  return clients
}

func chair(barber chan<-Client) chan <- Client {
  clients := make(chan Client, 3)
  go func() {
    for client := range clients {
      fmt.Printf("Cliente %q aguardando\n", client.name)
      time.Sleep(1)
      select {
      case barber <- client:
      }
    }
  }()
  return clients
}

func main() {
  clients := []Client{
    {name: "Bob"},
    {name: "Zeca"},
    {name: "Mary"},
    {name: "Oz"},
  }

  barber := barber()
  chair := chair(barber)

    for _, client := range clients {
      fmt.Printf("Cliente %q entra na barbearia\n", client.name)
      select {
        case barber <- client:
        default:
          select {
          case chair <- client:
          default: fmt.Printf("Cliente %q desiste\n", client.name)
        }
      }
    }

    time.Sleep(1e9)

}