boring go concurrency pattern

boring.go

package main

/**
 * simple go concurrency pattern
 * generator + fanIn
 */

import (
	"fmt"
	"math/rand"
	"time"
)

/**
 * fanIn listens to both channel and send the message to main goroutine.
 */
func fanIn(i, j <-chan string) <-chan string {
	c := make(chan string)
	go func() { for { c <- <-i }}()
	go func() { for { c <- <-j }}()
	return c
}

/**
 * boring returns `receive` chan of string and constantly put string into the channel
 */
func boring(s string) <-chan string {
	c := make(chan string)
	go func() {
		for i := 0; ; i++ {
			c <- fmt.Sprintf("%s %d", s, i)
			time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
		}
	}()
	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")
}