关注重连事件

Because reconnect is primarily under the covers, many libraries provide an event listener you can use to be notified of reconnect events. This event can be especially important for applications sending a lot of messages.

Go

// 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.DisconnectErrHandler(func(nc *nats.Conn, err error) {
        // handle disconnect error event
    }),
    nats.ReconnectHandler(func(nc *nats.Conn) {
        // handle reconnect event
    }))
if err != nil {
    log.Fatal(err)
}
defer nc.Close()

// Do something with the connection

Java

JavaScript

Python

Ruby

C