Express socket.io to netty socket.io in spring - spring

Question

I need to stream data from my backend (in spring) to my angular frontend.
I cant get the netty socket.io implementation working.
public ConnectListener onUserConnectWithSocket = new ConnectListener() {
#Override
public void onConnect(SocketIOClient socketIOClient) {
log.info("Client connected: " + socketIOClient.getSessionId());
socketIOClient.sendEvent("getAllDashboardData", generateRandomValues());
}
};
public DataListener<String> getAllDashboardData = new DataListener<String>() {
#Override
public void onData(SocketIOClient socketIOClient, String message, AckRequest ackRequest) throws Exception {
log.info("Message received: " + message);
socketIOClient.sendEvent("getAllDashboardData", generateRandomValues().toString());
}
};
when i have something like this, the EventListener never gets called (does not log User requested data). Hence, the onConnect logs that the frontend connected.
I tried out the frontend call using express!
This simple examples works perfect:
module.exports = (io) => {
io.on('connect', (socket) => {
console.log('user connected');
socket.on('getAllDashboardData', (data) => {
//send some data to client back
socket.emit('getAllDashboardData', {data: 'data'});
});
socket.on('disconnect', () => {
console.log('user disconnected');
});
});
}
how could i write this in spring?
I also tested the backend with postman and it works fine!

Answer 1

The answer is:
import { Injectable } from '#angular/core';
const io = require('socket.io-client');
import {Observable} from "rxjs";
#Injectable({
providedIn: 'root'
})
export class SocketService {
socket: any;
readonly uri = 'ws://localhost:8085';
constructor() {
this.socket = io(this.uri);
}
listen(eventName: string) {
return new Observable((resolve) => {
this.socket.on(eventName, (data: any) => {
// this.socket.emit(eventName, data); maybe don't use this produces 1000 of calls
resolve.next(data);
});
});
}
emit(eventName: string, data: any) {
this.socket.emit(eventName, data);
}
}
and use socket.io-client version 2.3.0 to work with netty spring.