Add producer/consumer example with use of queue name for distribution of messages

examples/pubsub/consumer.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+
+	log "github.com/golang/glog"
+	"github.com/micro/go-micro/broker"
+	"github.com/micro/go-micro/cmd"
+
+	_ "github.com/micro/go-plugins/broker/rabbitmq"
+)
+
+var (
+	topic = "go.micro.topic.foo"
+)
+
+// Example of a shared subscription which receives a subset of messages
+func sharedSub() {
+	_, err := broker.Subscribe(topic, func(p broker.Publication) error {
+		fmt.Println("[sub] received message:", string(p.Message().Body), "header", p.Message().Header)
+		return nil
+	}, broker.QueueName("consumer"))
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+// Example of a subscription which receives all the messages
+func sub() {
+	_, err := broker.Subscribe(topic, func(p broker.Publication) error {
+		fmt.Println("[sub] received message:", string(p.Message().Body), "header", p.Message().Header)
+		return nil
+	})
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+func main() {
+	cmd.Init()
+
+	if err := broker.Init(); err != nil {
+		log.Fatalf("Broker Init error: %v", err)
+	}
+	if err := broker.Connect(); err != nil {
+		log.Fatalf("Broker Connect error: %v", err)
+	}
+
+	sub()
+	select {}
+}

examples/pubsub/producer.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	log "github.com/golang/glog"
+	"github.com/micro/go-micro/broker"
+	"github.com/micro/go-micro/cmd"
+
+	_ "github.com/micro/go-plugins/broker/rabbitmq"
+)
+
+var (
+	topic = "go.micro.topic.foo"
+)
+
+func pub() {
+	tick := time.NewTicker(time.Second)
+	i := 0
+	for _ = range tick.C {
+		msg := &broker.Message{
+			Header: map[string]string{
+				"id": fmt.Sprintf("%d", i),
+			},
+			Body: []byte(fmt.Sprintf("%d: %s", i, time.Now().String())),
+		}
+		if err := broker.Publish(topic, msg); err != nil {
+			log.Errorf("[pub] failed: %v", err)
+		} else {
+			fmt.Println("[pub] pubbed message:", string(msg.Body))
+		}
+		i++
+	}
+}
+
+func main() {
+	cmd.Init()
+
+	if err := broker.Init(); err != nil {
+		log.Fatalf("Broker Init error: %v", err)
+	}
+
+	if err := broker.Connect(); err != nil {
+		log.Fatalf("Broker Connect error: %v", err)
+	}
+
+	pub()
+}