private void notifyListenersOfSource(final String sourceId) {
   final FoundSourceListener[] lisArr;
   synchronized (this) {
     lisArr = new FoundSourceListener[listeners.size()];
     listeners.toArray(lisArr);
   }
   mina.getExecutor()
       .execute(
           new CatchingRunnable() {
             public void doRun() throws Exception {
               for (FoundSourceListener listener : lisArr) {
                 listener.foundBroadcaster(streamId, sourceId);
               }
             }
           });
 }