// Connection event handlers are invoked asynchronously
// and the state of the connection may have changed when
// the callback is invoked.
nc, err := nats.Connect("demo.nats.io",
	nats.DisconnectHandler(func(nc *nats.Conn) {
		// handle disconnect event
	}),
	nats.ReconnectHandler(func(nc *nats.Conn) {
		// handle reconnect event
	}))
if err != nil {
	log.Fatal(err)
}
defer nc.Close()

// Do something with the connection

Options options = new Options.Builder().
                            server("nats://demo.nats.io:4222").
                            connectionListener((conn, type) -> {
                                if (type == Events.RECONNECTED) {
                                    // handle reconnected
                                } else if (type == Events.DISCONNECTED) {
                                    // handle disconnected, wait for reconnect
                                }
                            }).
                            build();
Connection nc = Nats.connect(options);

// Do something with the connection

nc.close();

let nc = NATS.connect({
    maxReconnectAttempts: 10,
    servers: ["nats://demo.nats.io:4222"]
});

nc.on('reconnect', (c) => {
    console.log('reconnected');
});

nc = NATS()

async def disconnected_cb():
   print("Got disconnected!")

async def reconnected_cb():
   # See who we are connected to on reconnect.
   print("Got reconnected to {url}".format(url=nc.connected_url.netloc))

await nc.connect(
   servers=["nats://demo.nats.io:4222"],
   reconnect_time_wait=10,
   reconnected_cb=reconnected_cb,
   disconnected_cb=disconnected_cb,
   )

# Do something with the connection.

require 'nats/client'

NATS.start(servers: ["nats://127.0.0.1:1222", "nats://127.0.0.1:1223", "nats://127.0.0.1:1224"]) do |nc|
   # Do something with the connection
   nc.on_reconnect do
    puts "Got reconnected to #{nc.connected_server}"
  end

  nc.on_disconnect do |reason|
    puts "Got disconnected! #{reason}"
  end
end

// will throw an exception if connection fails
let nc = await connect({
    maxReconnectAttempts: 10,
    servers: ["nats://demo.nats.io:4222"]
});
// first argument is the connection (same as nc in this case)
// second argument is the url of the server where the client
// connected
nc.on('reconnect', (conn, server) => {
    console.log('reconnected to', server);
});
nc.close();