/**
* Construct.
*
* @param location The key identifying the client window to which this courier delivers updates.
* @param elementId The key identifying the element on the Portal Page that would need a courier
* delivered message when things change.
*/
public ObservingCourier(String location, String elementId) {
m_deliveryId = SessionManager.getCurrentSession().getId() + location;
m_elementId = elementId;
m_location = location;
// "inject" a CourierService
m_courierService = org.sakaiproject.courier.cover.CourierService.getInstance();
}
/**
* Respond to access requests.
*
* @param req The servlet request.
* @param res The servlet response.
* @throws ServletException.
* @throws IOException.
*/
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// support two "/" separated parameters [1] and [2]) - both get presence updated, the first is
// the address for delivery (second optional)
String[] parts = req.getPathInfo().split("/");
if ((parts.length == 2) || (parts.length == 3)) {
String placementId = parts[1];
// if we are in a newly created session where we had an invalid (presumed timed out) session
// in the request,
// send script to cause a sakai top level redirect
if (ThreadLocalManager.get(SessionManager.CURRENT_INVALID_SESSION) != null) {
String loggedOutUrl = ServerConfigurationService.getLoggedOutUrl();
if (M_log.isDebugEnabled())
M_log.debug("sending top redirect: " + placementId + " : " + loggedOutUrl);
sendTopRedirect(res, loggedOutUrl);
} else {
String requestUserId = req.getParameter("userId");
Session session = sessionManager.getCurrentSession();
if (requestUserId == null || requestUserId.equals(session.getUserId())) {
// compute our courier delivery address: this placement in this session
String deliveryId = session.getId() + placementId;
// find all deliveries for the requested deivery address
List deliveries = CourierService.getDeliveries(deliveryId);
// see if any DeliveryProviders have deliveries
List<DeliveryProvider> providers = CourierService.getDeliveryProviders();
if (providers != null) {
List<Delivery> moreDeliveries = new ArrayList<Delivery>();
for (DeliveryProvider provider : providers) {
List<Delivery> d = provider.getDeliveries(session.getId(), placementId);
if (d != null && !d.isEmpty()) {
moreDeliveries.addAll(d);
}
}
if (moreDeliveries.isEmpty()) {
// use deliveries
} else if (deliveries.isEmpty()) {
deliveries = moreDeliveries;
} else {
// both lists have deliveries, so add moreDeliveries to deliveries
deliveries.addAll(moreDeliveries);
}
}
// form the reply
sendDeliveries(res, deliveries);
// refresh our presence at the location (placement)
if (M_log.isDebugEnabled()) M_log.debug("setting presence: " + placementId);
PresenceUpdater.setPresence(placementId);
// register another presence if present
if (parts.length == 3) {
String secondPlacementId = parts[2];
if (M_log.isDebugEnabled())
M_log.debug("setting second presence: " + secondPlacementId);
PresenceUpdater.setPresence(secondPlacementId);
}
} else {
// This courier request was not meant for this user (i.e., session), so we won't honour it
M_log.debug(
"out-of-session courier request: requestUserId="
+ requestUserId
+ " session user="******"bad courier request: " + req.getPathInfo());
sendDeliveries(res, new Vector());
}
}