Go’s select enable you to wait on multiple channel operations.
Combining goroutines and channels with select is a powerful feature of Go Language
package main
import "time"
import "fmt"
func main() {
// For our example we’ll select across two channels.
c1 := make(chan string)
c2 := make(chan string)
// Each channel will receive a value after some amount of time, to simulate e.g. blocking RPC operations executing in concurrent goroutines.
go func() {
time.Sleep(time.Second * 1)
c1 <- "one"
}()
go func() {
time.Sleep(time.Second * 2)
c2 <- "two"
}()
// We’ll use select to await both of these values simultaneously, printing each one as it arrives.
for i := 0; i < 2; i++ {
select {
case msg1 := <-c1:
fmt.Println("received", msg1)
case msg2 := <-c2:
fmt.Println("received", msg2)
}
}
}
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Output for the above go language program
//We receive the values "one" and then "two" as expected.
$ time go run select.go
received one
received two
Note that the total execution time is only ~2 seconds since both the 1 and 2 second Sleeps execute concurrently.
real 0m2.245s
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