blob: fc609c2d54a2b812194ad258df49df502e6f3f5c [file] [log] [blame]
package main
import (
"fmt"
"math/rand"
"time"
)
// START1 OMIT
func main() {
c := fanIn(boring("Joe"), boring("Ann")) // HL
for i := 0; i < 10; i++ {
fmt.Println(<-c) // HL
}
fmt.Println("You're both boring; I'm leaving.")
}
// STOP1 OMIT
// START2 OMIT
func boring(msg string) <-chan string { // Returns receive-only channel of strings. // HL
c := make(chan string)
go func() { // We launch the goroutine from inside the function. // HL
for i := 0; ; i++ {
c <- fmt.Sprintf("%s: %d", msg, i)
time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
}
}()
return c // Return the channel to the caller. // HL
}
// STOP2 OMIT
// START3 OMIT
func fanIn(input1, input2 <-chan string) <-chan string { // HL
c := make(chan string)
go func() { // HL
for {
select { // HL
case s := <-input1: c <- s // HL
case s := <-input2: c <- s // HL
} // HL
}
}()
return c
}
// STOP3 OMIT