// Shows different ways to create a Conn
func ExampleConnect() {
nats.Connect(nats.DefaultURL)
nats.Connect("nats://*****:*****@nats.apcera.com:421")
opts := nats.Options{
AllowReconnect: true,
MaxReconnect: 10,
ReconnectWait: 5 * time.Second,
Timeout: 1 * time.Second,
}
nc, _ := opts.Connect()
nc.Close()
}
func ExampleConn_PublishMsg() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
msg := &nats.Msg{Subject: "foo", Reply: "bar", Data: []byte("Hello World!")}
nc.PublishMsg(msg)
}
func ExampleSubscription_Unsubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
sub, _ := nc.SubscribeSync("foo")
// ...
sub.Unsubscribe()
}
// This Example shows an asynchronous subscriber.
func ExampleConn_Subscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Subscribe("foo", func(m *nats.Msg) {
fmt.Printf("Received a message: %s\n", string(m.Data))
})
}
func ExampleConn_Request() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Subscribe("foo", func(m *nats.Msg) {
nc.Publish(m.Reply, []byte("I will help you"))
})
nc.Request("foo", []byte("help"), 50*time.Millisecond)
}
func ExampleConn_QueueSubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
received := 0
nc.QueueSubscribe("foo", "worker_group", func(_ *nats.Msg) {
received += 1
})
}
func ExampleSubscription_NextMsg() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
sub, _ := nc.SubscribeSync("foo")
m, err := sub.NextMsg(1 * time.Second)
if err == nil {
fmt.Printf("Received a message: %s\n", string(m.Data))
} else {
fmt.Println("NextMsg timed out.")
}
}
func ExampleConn_Flush() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
msg := &nats.Msg{Subject: "foo", Reply: "bar", Data: []byte("Hello World!")}
for i := 0; i < 1000; i++ {
nc.PublishMsg(msg)
}
err := nc.Flush()
if err == nil {
// Everything has been processed by the server for nc *Conn.
}
}
// EncodedConn can publish virtually anything just
// by passing it in. The encoder will be used to properly
// encode the raw Go type
func ExampleEncodedConn_Publish() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
}
// BindSendChan() allows binding of a Go channel to a nats
// subject for publish operations. The Encoder attached to the
// EncodedConn will be used for marshalling.
func ExampleEncodedConn_BindSendChan() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
ch := make(chan *person)
c.BindSendChan("hello", ch)
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
ch <- me
}
func ExampleSubscription_AutoUnsubscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
received, wanted, total := 0, 10, 100
sub, _ := nc.Subscribe("foo", func(_ *nats.Msg) {
received += 1
})
sub.AutoUnsubscribe(wanted)
for i := 0; i < total; i++ {
nc.Publish("foo", []byte("Hello"))
}
nc.Flush()
fmt.Printf("Received = %d", received)
}
// BindRecvChan() allows binding of a Go channel to a nats
// subject for subscribe operations. The Encoder attached to the
// EncodedConn will be used for un-marshalling.
func ExampleEncodedConn_BindRecvChan() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
ch := make(chan *person)
c.BindRecvChan("hello", ch)
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
// Receive the publish directly on a channel
who := <-ch
fmt.Printf("%v says hello!\n", who)
}
// EncodedConn's subscribers will automatically decode the
// wire data into the requested Go type using the Decode()
// method of the registered Encoder. The callback signature
// can also vary to include additional data, such as subject
// and reply subjects.
func ExampleEncodedConn_Subscribe() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
defer c.Close()
type person struct {
Name string
Address string
Age int
}
c.Subscribe("hello", func(p *person) {
fmt.Printf("Received a person! %+v\n", p)
})
c.Subscribe("hello", func(subj, reply string, p *person) {
fmt.Printf("Received a person on subject %s! %+v\n", subj, p)
})
me := &person{Name: "derek", Age: 22, Address: "85 Second St"}
c.Publish("hello", me)
}
func ExampleConn_Publish() {
nc, _ := nats.Connect(nats.DefaultURL)
defer nc.Close()
nc.Publish("foo", []byte("Hello World!"))
}
// Shows how to wrap a Conn into an EncodedConn
func ExampleNewEncodedConn() {
nc, _ := nats.Connect(nats.DefaultURL)
c, _ := nats.NewEncodedConn(nc, "json")
c.Close()
}
func ExampleConn_Close() {
nc, _ := nats.Connect(nats.DefaultURL)
nc.Close()
}