54 lines
997 B
Go
54 lines
997 B
Go
package daemons
|
|
|
|
import (
|
|
"log"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/localhots/satan"
|
|
)
|
|
|
|
// NumberPrinter is a daemon that prints numbers once in a while.
|
|
type NumberPrinter struct {
|
|
satan.BaseDaemon
|
|
}
|
|
|
|
// Startup sets up panic handler and starts enqueuing number printing jobs.
|
|
func (n *NumberPrinter) Startup() {
|
|
n.HandlePanics(func() {
|
|
log.Println("Oh, crap!")
|
|
})
|
|
|
|
go n.enqueue()
|
|
}
|
|
|
|
// Shutdown is empty due to the lack of cleanup.
|
|
func (n *NumberPrinter) Shutdown() {}
|
|
|
|
func (n *NumberPrinter) enqueue() {
|
|
for {
|
|
select {
|
|
case <-n.ShutdownRequested():
|
|
return
|
|
default:
|
|
}
|
|
|
|
// Generate a random number between 1000 and 9999 and print it
|
|
num := 1000 + rand.Intn(9000)
|
|
n.Process(n.makeActor(num))
|
|
|
|
// Sleep for a second or less
|
|
time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
|
|
}
|
|
}
|
|
|
|
func (n *NumberPrinter) makeActor(num int) satan.Actor {
|
|
return func() {
|
|
if rand.Intn(20) == 0 {
|
|
panic("Noooooooooo!")
|
|
}
|
|
|
|
log.Println("NumberPrinter says", num)
|
|
}
|
|
}
|