cook.go

// play with gorouintes inspired by the Day3 pdf IsReady exmaple
//
// parallel cooking
//
// one cook does not block another
// time ./cook roughly equals to the longest single cook
// instead of sum of the cooks

package main

import "time"

type Cook struct {
	count int
	c     chan string
}

func newCook() *Cook {
	ck := new(Cook)
	ck.c = make(chan string)
	return ck
}

func (ck *Cook) cook(name string, sec int64) {
	ck.count++
	go func() {
		println("cooking", name)
		time.Sleep(sec * 1e9)
		ck.c <- name
	}()
}

func (ck *Cook) wait() {
	for i := 0; i < ck.count; i++ {
		println(<-ck.c, "is ready.")
	}
}

func main() {
	ck := newCook()
	ck.cook("coffee", 5)
	ck.cook("tea", 3)
	ck.cook("cake", 10)
	ck.cook("pie", 8)
	ck.cook("nuts", 2)
	ck.wait()
}