[jetty-dev] Programmatic WebSocket upgrade on Jetty 10

[Rossen Stoyanchev <rstoyanchev@xxxxxxxxxx>]

Hi,

I need to support WebSocket upgrades on Jetty 10 from within a web framework. Like what JettyWebSocketServlet or WebSocketUpgradeFilter do internally but not actually using them nor relying on their mapping mechanism.

My initial attempt at a minimal custom Servlet to do this:

@SuppressWarnings("serial")

public class MyServlet extends HttpServlet {

    private final Handshaker handshaker = new HandshakerSelector();

    private WebSocketComponents components;

    private JettyServerFrameHandlerFactory frameHandlerFactory;

    @Override

    public void init(ServletConfig config) throws ServletException {

        super.init(config);

        this.components = WebSocketServerComponents.getWebSocketComponents(getServletContext());

        this.frameHandlerFactory = JettyServerFrameHandlerFactory.getFactory(getServletContext());

    }

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        Configuration.Customizer customizer = new Configuration.ConfigurationCustomizer();

        WebSocketCreator creator = (req1, resp1) -> new MyEchoSocket();

        CreatorNegotiator negotiator = new CreatorNegotiator(creator, this.frameHandlerFactory, customizer);

        this.handshaker.upgradeRequest(negotiator, req, resp, this.components, null);

    }

}

 

However, several types are from "internal" packages. Is there a better to do this? It would be very useful to have some basic API for programmatic WebSocket upgrades from a framework or application Servlet.

Thanks,

Rossen