Go Select and Channels Using select with timeouts
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Example
So here, I have removed the for loops, and made a timeout by adding a second case to the select that returns after 3 seconds. Because the select just waits until ANY case is true, the second case fires, and then our script ends, and chatter() never even gets a chance to finish.
// Use of the select statement with channels, for timeouts, etc.
package main
import (
"fmt"
"time"
)
// Function that is "chatty"
//Takes a single parameter a channel to send messages down
func chatter(chatChannel chan<- string) {
// loop ten times and die
time.Sleep(5 * time.Second) // sleep for 5 seconds
chatChannel<- fmt.Sprintf("This is pass number %d of chatter", 1)
}
// out main function
func main() {
// Create the channel, it will be taking only strings, no need for a buffer on this project
chatChannel := make(chan string)
// Clean up our channel when we are done
defer close(chatChannel)
// start a go routine with chatter (separate, no blocking)
go chatter(chatChannel)
// select statement will block this thread until one of the two conditions below is met
// because we have a default, we will hit default any time the chatter isn't chatting
select {
// anytime the chatter chats, we'll catch it and output it
case spam := <-chatChannel:
fmt.Println(spam)
// if the chatter takes more than 3 seconds to chat, stop waiting
case <-time.After(3 * time.Second):
fmt.Println("Ain't no time for that!")
}
}
