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Channels.go
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Channels.go
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package main
import (
"fmt"
"math/rand"
"time"
)
// func main() {
// c := make(chan string)
// go boring("boring!", c)
// for i := 0; i < 5; i++ {
// fmt.Printf("You say: %q\n", <-c) // Receive expression is just a value.
// }
// fmt.Println("You're boring; I'm leaving.")
// }
// func boring(msg string, c chan string) {
// for i := 0; ; i++ {
// c <- fmt.Sprintf("%s %d", msg, i) // Expression to be sent can be any suitable value.
// //time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
// }
// }
// func main() {
// c := boring("boring!") // Function returning a channel.
// for i := 0; i < 6; i++ {
// fmt.Printf("You say: %q\n", <-c)
// }
// fmt.Println("You're boring; I'm leaving.")
// }
func boring(msg string) <-chan string { // Returns receive-only channel of strings.
c := make(chan string)
go func() { // We launch the goroutine from inside the function.
for i := 0; ; i++ {
c <- fmt.Sprintf("%s %d", msg, i)
time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
}
}()
fmt.Println("You're boring; I'm leaving.1111")
return c // Return the channel to the caller.
}
func fanIn(input1, input2 <-chan string) <-chan string {
c := make(chan string)
go func() {
for {
c <- <-input1
}
}()
go func() {
for {
c <- <-input2
}
}()
return c
}
func main() {
c := fanIn(boring("Joe"), boring("Ann"))
for i := 0; i < 10; i++ {
fmt.Println(<-c)
}
fmt.Println("You're both boring; I'm leaving.")
}