Exemplo n.º 1
0
  /** Servlet GET request: handles event requests. */
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    Event event = null;

    try {
      // Event parm identifies event type from the client
      String eventType = Servlets.getParameter(request, P_EVENT);

      // Always must have an event type
      if (eventType == null) {
        Log.warn("Pushlet.doGet(): bad request, no event specified");
        response.sendError(HttpServletResponse.SC_BAD_REQUEST, "No eventType specified");
        return;
      }
      // Create Event and set attributes from parameters
      event = new Event(eventType);
      for (Enumeration e = request.getParameterNames(); e.hasMoreElements(); ) {
        String nextAttribute = (String) e.nextElement();
        event.setField(nextAttribute, request.getParameter(nextAttribute));
      }
    } catch (Throwable t) {
      // Error creating event
      Log.warn("Pushlet: Error creating event in doGet(): ", t);
      response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
      return;
    }
    // Handle parsed request
    doRequest(event, request, response);
  }
Exemplo n.º 2
0
 /** Generic request handler (GET+POST). */
 protected void doRequest(
     Event anEvent, HttpServletRequest request, HttpServletResponse response) {
   // Must have valid event type.
   String eventType = anEvent.getEventType();
   try {
     // Get Session: either by creating (on Join eventType)
     // or by id (any other eventType, since client is supposed to have
     // joined).
     Session session = null;
     if (eventType.startsWith(Protocol.E_JOIN)) {
       // Join request: create new subscriber
       session = SessionManager.getInstance().createSession(anEvent);
       String userAgent = request.getHeader("User-Agent");
       if (userAgent != null) {
         userAgent = userAgent.toLowerCase();
       } else {
         userAgent = "unknown";
       }
       session.setUserAgent(userAgent);
     } else {
       // Must be a request for existing Session
       // Get id
       String id = anEvent.getField(P_ID);
       // We must have an id value
       if (id == null) {
         response.sendError(HttpServletResponse.SC_BAD_REQUEST, "No id specified");
         Log.warn("Pushlet: bad request, no id specified event=" + eventType);
         return;
       }
       // We have an id: get the session object
       session = SessionManager.getInstance().getSession(id);
       // Check for invalid id
       if (session == null) {
         response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Invalid or expired id: " + id);
         Log.warn("Pushlet:  bad request, no session found id=" + id + " event=" + eventType);
         return;
       }
     }
     // ASSERTION: we have a valid Session
     // Let Controller handle request further
     // including exceptions
     Command command = Command.create(session, anEvent, request, response);
     session.getController().doCommand(command);
   } catch (Throwable t) {
     // Hmm we should never ever get here
     Log.warn("Pushlet:  Exception in doRequest() event=" + eventType, t);
     t.printStackTrace();
     response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
   }
 }
Exemplo n.º 3
0
 /** Servlet POST request: extracts event data from body. */
 public void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
   Event event = null;
   try {
     // Create Event by parsing XML from input stream.
     event = EventParser.parse(new InputStreamReader(request.getInputStream()));
     // Always must have an event type
     if (event.getEventType() == null) {
       Log.warn("Pushlet.doPost(): bad request, no event specified");
       response.sendError(HttpServletResponse.SC_BAD_REQUEST, "No eventType specified");
       return;
     }
   } catch (Throwable t) {
     // Error creating event
     Log.warn("Pushlet:  Error creating event in doPost(): ", t);
     response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
     return;
   }
   // Handle parsed request
   doRequest(event, request, response);
 }