public void sendMessageOnChannel(
HttpServletRequest request,
final String message,
final String channel,
final String... excludeUsers) {
// get the application scoped model, and copy the list of subscribers, so that the
// long running task of publishing doesnt interfere with new logins
// final AsyncContext publisherAsyncCtx = request.startAsync();
ServletContext appScope = request.getServletContext();
@SuppressWarnings("unchecked")
final Map<String, List<Subscriber>> clients =
(Map<String, List<Subscriber>>) appScope.getAttribute(Keys.CLIENTS);
final List<Subscriber> subscribers = new ArrayList<Subscriber>(clients.get(channel));
// here is the logic for publishing - it will be passed to the container
// for execution sometime in the future
// Runnable r = new Runnable() {
// @Override
// public void run() {
System.out.println("updating games channel for " + subscribers.size() + " subscribers...");
long start = System.currentTimeMillis();
// keep a list of failed subscribers so we can remove them at
// the end
List<Subscriber> toRemove = new ArrayList<Subscriber>();
for (Subscriber s : subscribers) {
if (null != excludeUsers
&& excludeUsers.length > 0
&& Arrays.asList(excludeUsers).contains(s.getUser().getUserName())) {
continue;
}
synchronized (s) {
AsyncContext aCtx = s.getaCtx();
try {
aCtx.getResponse().getOutputStream().print(message);
aCtx.complete();
} catch (Exception e) {
System.err.println(
"failed to send to client - removing from list of subscribers on this channel");
toRemove.add(s);
}
}
}
// remove the failed subscribers from the model in app scope,
// not our copy of them
synchronized (clients) {
clients.get(channel).removeAll(toRemove);
}
// log success
long ms = System.currentTimeMillis() - start;
String ok = "finished updating games channel " + channel + " in " + ms + " ms.";
System.out.println(ok);
// publisherAsyncCtx.complete(); // we are done, the connection can
// // be closed now
// }
// };
//
// // start the async processing (using a pool controlled by the container)
// publisherAsyncCtx.start(r);
}
