@Override
    public void joinedCluster(byte[] nodeID) {
        // Another node joined a cluster that we're already part of. It is expected that
        // the implementation of #joinedCluster() as executed on the cluster node that just
        // joined will synchronize all relevant data. This method need not do anything.
    }
Checks if the packet is a presence stanza that intends to reflect an update back to the client from which the update originated.

@param packet The stanza (cannot be null.
@return true if the packet is presence reflection, otherwise false.
xmppserver/src/main/java/org/jivesoftware/openfire/handler/PresenceUpdateHandler.java