How to detect if RSocket connection is successfull? - spring-boot

Question

I have the following program through which I can detect the connection failure i.e doBeforeRetry.
Can someone tell me how to detect the successful connection or reconnection. I want to integrate a Health Check program that monitors this connection, but I am unable to capture the event that informs the connections is successfull.
Thanks
requester = RSocketRequester.builder()
.rsocketConnector(connector -> {
connector.reconnect(Retry
.fixedDelay(Integer.MAX_VALUE,Duration.ofSeconds(1))
.doBeforeRetry(e-> System.out.println("doBeforeRetry===>"+e))
.doAfterRetry(e-> System.out.println("doAfterRetry===>"+e))
);
connector.payloadDecoder(PayloadDecoder.ZERO_COPY);
}
).dataMimeType(MediaType.APPLICATION_CBOR)
.rsocketStrategies(strategies)
.tcp("localhost", 7999);

Answer 1

I achieved the detection of successful connection or reconnection with the following approach.
Client Side (Connection initialization)
Mono<RSocketRequester> requester = Mono.just(RSocketRequester.builder()
.rsocketConnector(
// connector configuration goes here
)
.dataMimeType(MediaType.APPLICATION_CBOR)
.setupRoute("client-handshake")
.setupData("caller-name")
.tcp("localhost", 7999)));
One the server side
#ConnectMapping("client-handshake")
public void connect(RSocketRequester requester, #Payload String callerName) {
LOG.info("Client Connection Handshake: [{}]", callerName);
requester
.route("server-handshake")
.data("I am server")
.retrieveMono(Void.class)
.subscribe();
}
On the client side, when I receive the callback on the below method, I detect the connection is successfull.
#MessageMapping("server-handshake")
public Mono<ConsumerPreference> handshake(final String response){
LOG.info("Server Connection Handshake received : Server message [{}]", response.getCallerName());
connectionSuccess.set(true);
return Mono.empty();
}else{
throw new InitializationException("Invalid response message received from Server");
}
}
Additionally, created a application level heartbeat to ensure, the liveliness of the connection.

Answer 2

If you want to know if it's actually healthy, you should probably have a side task that is polling the health of the RSocket, by sending something like a custom ping protocol to your backend. You could time that and confirm that you have a healthy connection, record latencies and success/failures.