Go workers example

GoWorkers.go

package main

import (
	"fmt"
	"time"
)

func printWorker(name string, days int) {
	weeks := days / 7
    	restDays := days % 7
	if restDays == 0 {
		fmt.Printf("%s ha trabajando en la empresa %d semanas\n", name, weeks)
	} else {
		fmt.Printf("%s ha trabajando en la empresa %d semanas y %d días\n", name, weeks, restDays)
	}

}

// @link: https://tour.golang.org/concurrency/4
func worker(id int, jobs <-chan int, results chan<- int, items map[string]int, keysItems []string) {
	for j := range jobs {
		//fmt.Println("worker", id, "processing job", j)
		index := keysItems[j-1]
		printWorker(index, items[index])
		time.Sleep(time.Second)
		results <- j * 2
	}
}

func getKeys(mymap map[string]int) []string {
	keys := make([]string, len(mymap))
	i := 0
	for k := range mymap {
		keys[i] = k
		i++
	}
	return keys
}

func main() {
	numWorkers := 2
	items := map[string]int{"Robert": 30, "John": 475, "Elly": 1022, "Bob": 99}
	lenItems := len(items)
	keysItems := getKeys(items)
	job := make(chan int, 10)
	result := make(chan int, 10)
	for w := 1; w <= numWorkers; w++ {
		go worker(w, job, result, items, keysItems)
	}
	for j := 1; j <= lenItems; j++ {
		job <- j
	}
	close(job)
	for a := 1; a <= lenItems; a++ {
		<-result
	}
}