Added an extra step to the datagram negotation process. Before

the server starts sending datagrams willy-nilly, it must wait for 
a (reliable) go-ahead from the client.  Otherwise, it's possible 
that the server may be successfully receiving datagrams but not 
sending them.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5792 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/server/PresentsSession.java

@@ -63,6 +63,7 @@ import com.threerings.presents.net.PingRequest;
 import com.threerings.presents.net.PongResponse;
 import com.threerings.presents.net.SubscribeRequest;
 import com.threerings.presents.net.ThrottleUpdatedMessage;
+import com.threerings.presents.net.TransmitDatagramsRequest;
 import com.threerings.presents.net.UnsubscribeRequest;
 import com.threerings.presents.net.UnsubscribeResponse;
 import com.threerings.presents.net.UpdateThrottleMessage;
@@ -1085,6 +1086,18 @@ public class PresentsSession
         }
     }
 
+    /**
+     * Processes datagram transmission requests.
+     */
+    protected static class TransmitDatagramsDispatcher implements MessageDispatcher
+    {
+        public void dispatch (PresentsSession client, Message msg)
+        {
+            log.debug("Client requested datagram transmission", "client", client);
+            client.getConnection().setTransmitDatagrams(true);
+        }
+    }
+
     /**
      * Processes throttle updated messages.
      */
@@ -1158,6 +1171,7 @@ public class PresentsSession
         _disps.put(UnsubscribeRequest.class, new UnsubscribeDispatcher());
         _disps.put(ForwardEventRequest.class, new ForwardEventDispatcher());
         _disps.put(PingRequest.class, new PingDispatcher());
+        _disps.put(TransmitDatagramsRequest.class, new TransmitDatagramsDispatcher());
         _disps.put(ThrottleUpdatedMessage.class, new ThrottleUpdatedDispatcher());
         _disps.put(LogoffRequest.class, new LogoffDispatcher());
     }