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()
}
}
//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()
}
}
//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
}
}
}