blob: 47bee60a7d1a04d5969d5c6eb9e0e5ce9aca0e2e [file] [log] [blame]
// +build OMIT
package main
import (
"fmt"
"math/rand"
"time"
)
// START1 OMIT
// Search runs query on a backend and returns the result.
type Search func(query string) Result
type Result struct {
Hit string
Err error
}
// First runs query on replicas and returns the first result.
func First(query string, replicas ...Search) Result {
c := make(chan Result, len(replicas))
search := func(replica Search) { c <- replica(query) }
for _, replica := range replicas {
go search(replica)
}
return <-c
}
// STOP1 OMIT
// START2 OMIT
func main() {
rand.Seed(time.Now().UnixNano())
start := time.Now()
result := First("golang",
fakeSearch("replica 1"),
fakeSearch("replica 2"))
elapsed := time.Since(start)
fmt.Printf("%+v\n", result)
fmt.Println(elapsed)
}
// STOP2 OMIT
func fakeSearch(kind string) Search {
return func(query string) Result {
time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
return Result{Hit: fmt.Sprintf("%s result for %q\n", kind, query)}
}
}