Make more room for examples

examples/daemons-kafka/daemons/number_printer.go

@@ -0,0 +1,45 @@
+package daemons
+
+import (
+	"math/rand"
+	"time"
+
+	"github.com/localhots/shezmu"
+)
+
+// NumberPrinter is a daemon that prints numbers once in a while.
+type NumberPrinter struct {
+	shezmu.BaseDaemon
+}
+
+// Startup sets up panic handler and starts enqueuing number printing jobs.
+func (n *NumberPrinter) Startup() {
+	n.HandlePanics(func(err interface{}) {
+		n.Logf("Oh, crap! There was a panic, take a look: %v", err)
+	})
+
+	n.LimitRate(3, time.Second)
+	n.SystemProcess("Random Number Generator", n.generateNumbers)
+}
+
+func (n *NumberPrinter) generateNumbers() {
+	for n.Continue() {
+		if rand.Intn(10) == 0 {
+			panic("Number generator refuses to work right now!")
+		}
+		// Generate a random number between 1000 and 9999 and print it
+		num := 1000 + rand.Intn(9000)
+		n.Process(n.makeActor(num))
+	}
+}
+
+func (n *NumberPrinter) makeActor(num int) shezmu.Actor {
+	return func() {
+		n.Log("Number printer says:", num)
+
+		// Making it crash sometimes
+		if num%10 == 0 {
+			panic("Nooooo! Random number generator returned a multiple of ten!")
+		}
+	}
+}

examples/daemons-kafka/daemons/price_consumer.go

@@ -0,0 +1,26 @@
+package daemons
+
+import (
+	"time"
+
+	"github.com/localhots/shezmu"
+)
+
+// PriceConsumer consumes price update messages and prints them to the console.
+type PriceConsumer struct {
+	shezmu.BaseDaemon
+}
+
+// PriceUpdate describes a price update message.
+type PriceUpdate struct {
+	Product string  `json:"product"`
+	Amount  float64 `json:"amount"`
+}
+
+// Startup creates a new subscription for ProductPriceUpdates topic.
+func (p *PriceConsumer) Startup() {
+	p.Subscribe("ProductPriceUpdates", func(u PriceUpdate) {
+		p.Logf("Price for %q is now $%.2f", u.Product, u.Amount)
+	})
+	p.LimitRate(5, time.Second)
+}