チャネルは共有マップを使用して Go の同時実行性をどのように強化できますか?

<code class="go">// key retrieval logic remains the same
values := make(map[string]int)

var valueCh = make(chan string)
var setCh = make(chan map[string]int)

// Handler for GET requests
http.HandleFunc("/get", func(w http.ResponseWriter, r *http.Request) {
  key := getKey(r)
  valueCh <- key
  fmt.Fprint(w, <-valueCh)
})

// Handler for SET requests
http.HandleFunc("/set", func(w http.ResponseWriter, r *http.Request) {
  key := getKey(r)
  tmp := make(map[string]int)
  tmp[key] = rand.Int()
  setCh <- tmp
})

// Map update goroutine
go func() {
  for {
    select {
    case key := <-valueCh:
      valueCh <- values[key]
    case updatedMap := <-setCh:
      for k, v := range updatedMap {
        values[k] = v
      }
    }
  }
}()</code>