Make shutdown handling predictable

example/daemons/number_printer.go

@@ -15,12 +15,12 @@ type NumberPrinter struct {
 
 // Startup sets up panic handler and starts enqueuing number printing jobs.
 func (n *NumberPrinter) Startup() {
-	n.HandlePanics(func() {
-		log.Println("Oh, crap! There was a panic, take a look:")
+	n.HandlePanics(func(err interface{}) {
+		log.Printf("Oh, crap! There was a panic, take a look: %v", err)
 	})
 
-	n.SystemProcess("Random Number Generator", n.generateNumbers)
 	n.LimitRate(1, 2*time.Second)
+	n.SystemProcess("Random Number Generator", n.generateNumbers)
 }
 
 // Shutdown is empty due to the lack of cleanup.

example/daemons/price_consumer.go

@@ -19,10 +19,10 @@ type PriceUpdate struct {
 
 // Startup creates a new subscription for ProductPriceUpdates topic.
 func (p *PriceConsumer) Startup() {
+	p.LimitRate(1, 500*time.Millisecond)
 	b.Subscribe("ProductPriceUpdates", func(u PriceUpdate) {
 		log.Printf("Price for %q is now $%.2f", u.Product, u.Amount)
 	})
-	p.LimitRate(1, 500*time.Millisecond)
 }
 
 // Shutdown is empty because PriceConsumer requires no cleanup upon exiting.