public ClusterSessionListener() 
{
    //--Constructor---------------------------------------------
}

 public boolean accept(ClusterMessage msg) 
{
        return (msg instanceof SessionMessage);
}

Accept only SessionMessage

 public String getInfo() 
{
        return (info);
}

Return descriptive information about this implementation.

 public  void messageReceived(ClusterMessage myobj) 
{
        if (myobj != null && myobj instanceof SessionMessage) {
            SessionMessage msg = (SessionMessage) myobj;
            String ctxname = msg.getContextName();
            //check if the message is a EVT_GET_ALL_SESSIONS,
            //if so, wait until we are fully started up
            Map managers = cluster.getManagers() ;
            if (ctxname == null) {
                java.util.Iterator i = managers.keySet().iterator();
                while (i.hasNext()) {
                    String key = (String) i.next();
                    ClusterManager mgr = (ClusterManager) managers.get(key);
                    if (mgr != null)
                        mgr.messageDataReceived(msg);
                    else {
                        //this happens a lot before the system has started
                        // up
                        if (log.isDebugEnabled())
                            log.debug("Context manager doesn't exist:"
                                    + key);
                    }
                }
            } else {
                ClusterManager mgr = (ClusterManager) managers.get(ctxname);
                if (mgr != null)
                    mgr.messageDataReceived(msg);
                else if (log.isWarnEnabled())
                    log.warn("Context manager doesn't exist:" + ctxname);
            }
        }
}

Callback from the cluster, when a message is received, The cluster will broadcast it invoking the messageReceived on the receiver.