Examples with ServerSentEventHandler org.glassfish.sse.api.ServerSentEventHandler used on opensource projects

Example 1 with ServerSentEventHandler

use of org.glassfish.sse.api.ServerSentEventHandler in project Payara by payara.

the class ServerSentEventServlet method doGet.

@Override
@SuppressWarnings("unchecked")
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    // TODO needs to be injected
    if (extension == null) {
        throw new RuntimeException("Enable CDI by including empty WEB-INF/beans.xml");
    }
    Map<String, ServerSentEventApplication> applicationMap = extension.getApplicationMap();
    ServerSentEventApplication sseApp = applicationMap.get(req.getServletPath());
    Class<?> clazz = sseApp.getHandlerClass();
    ServerSentEventHandler sseh;
    CreationalContext cc;
    // Check if SSE handler can be instantiated via CDI
    Iterator<Bean<?>> it = bm.getBeans(clazz).iterator();
    if (it.hasNext()) {
        Bean bean = it.next();
        cc = bm.createCreationalContext(bean);
        sseh = (ServerSentEventHandler) bean.create(cc);
    } else {
        throw new RuntimeException("Cannot create ServerSentEventHandler using CDI");
    }
    ServerSentEventHandler.Status status = sseh.onConnecting(req);
    if (status == ServerSentEventHandler.Status.DONT_RECONNECT) {
        resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
        cc.release();
        return;
    }
    if (status != ServerSentEventHandler.Status.OK) {
        throw new RuntimeException("Internal Error: need to handle status " + status);
    }
    resp.setStatus(HttpServletResponse.SC_OK);
    resp.setContentType("text/event-stream");
    // writes status code and headers
    resp.flushBuffer();
    AsyncContext ac = req.startAsync(req, resp);
    // no timeout. need config ?
    ac.setTimeout(0);
    ServerSentEventConnectionImpl con = sseApp.createConnection(req, sseh, cc, ac);
    ac.addListener(con);
    con.init();
}