Ejemplo n.º 1
0
func main() {
	var est estimation.Estimator
	est = new(estimation.TwomomentsChan)
	var stdin *bufio.Scanner
	stdin = bufio.NewScanner(os.Stdin)
	log.Print("Starting to read\n")
	//setup file reader
	inchan := make(chan float64)
	go utils.CatFloat(stdin, inchan)
	//output print server
	outchan := make(chan string)
	go utils.Print(os.Stdout, outchan)
	//main loop
	var number float64
	var ok bool
	for {
		select {
		case number, ok = <-inchan:
			if ok {
				est.Push(number)
			}
		}

		if !ok {
			//the channel has closed no new data is coming
			break
		}
		outchan <- est.String()
	}
}
Ejemplo n.º 2
0
//Spawn: Start a loop where we read off the in channel update the state and
//output the estimates on the outchan.
func Spawn(est estimation.Estimator,
	inchan chan float64, outchan chan string) {
	var number float64
	var ok bool
	for {
		select {
		case number, ok = <-inchan:
			if ok {
				est.Push(number)
			}
		}
		if !ok {
			//the channel has closed no new data is coming
			break
		}
		outchan <- est.String()
	}
}
Ejemplo n.º 3
0
//TestPeriodicQueryMain: Run a test showing consume a stream of numbers,
//estimating the distribution and and printing out the estimate at regular intervals of time.
func TestPeriodicQueryMain(t *testing.T) {
	var est estimation.Estimator
	est = new(estimation.Twomoments)
	inchan, err := getInput(datafile)
	if err != nil {
		t.Error(err.Error())
	}
	timedch := make(chan string)
	go utils.PeriodicQuery(time.Nanosecond,
		func() string { return est.String() },
		timedch)
	outchan := make(chan string)
	go utils.Print(os.Stdout, outchan)
	var number float64
	var ok bool
	var report string
	for {
		select {
		case number, ok = <-inchan:
			if ok {
				est.Push(number)
			}
		case report, ok = <-timedch:
			if ok {
				outchan <- report
			}
			if !ok {
				t.Logf("not ok in report\n")
			}
		}

		if !ok {
			break
		}
	}
}