The basis of cluster support for Presents servers. All servers in a cluster

make connections to other servers in the cluster and can exchange events (in a
limited fashion).

This is different than Liz's project wherein servers share an oid space and one
can interchangably work with distributed objects from any server. This package
provides a means by which certain services (by default, presence and chat) can
be communicated between servers to allow communication between players
scattered around a bunch of otherwise independent server instances.

This is less general purpose but also less likely to encourage people to write
code that tightly couples multiple servers and then falls over because it
generates gobs of network traffic as events are flung willy nilly behind the
scenes.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4238 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/client/Client.java

@@ -342,6 +342,16 @@ public class Client
         return stamp - _serverDelta;
     }
 
+    /**
+     * Returns true if we are in active communication (we may not yet be logged
+     * on, but we could be trying to log on).
+     */
+    public synchronized boolean isActive ()
+    {
+        // if we have a communicator, we're doing something
+        return (_comm != null);
+    }
+
     /**
      * Returns true if we are logged on, false if we're not.
      */