Function First

12-google3.0/main.go:30–39

How do we avoid discarding result from the slow server. We duplicates to many instance, and perform parallel request.

(query string, replicas ...Search)

// How do we avoid discarding result from the slow server.
// We duplicates to many instance, and perform parallel request.
func First(query string, replicas ...Search) Result {
	c := make(chan Result)
	for i := range replicas {
		go func(idx int) {
			c <- replicas[idx](query)
		}(i)
	}
	// the magic is here. First function always waits for 1 time after receiving the result
	return <-c
}

// I don't want to wait for slow server
func Google(query string) []Result {