[FEATURE] - Handling more than one connection

[kappsegla]

Problem Description

At the moment our code in clientHandler.handleConnections() isn't using threads or async I/O and can therefore not handle multiple clients at the same time. Can be seen as some sort of a bug and will have impacts on future developement.

I propose moving the call to serverSocket.accept() into our start method in Server class and then call ClientHandler handleConnection with the retrieved Socket objekt in a new thread.

Since we are using Java21 i propose using virtual threads.
Code suggestions:

public void start() {
        try {
            System.out.println("Server started on port 1883");
            while (!serverSocket.isClosed()) {
                Socket connection = null;
                connection = serverSocket.accept();
                Thread.ofVirtual(() -> clientHandler.handleConnection(connection));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }