log.trace(this + " sending ping to server. Currently managing lease " +
"for following clients:\n" + sb.toString());
}
Map clientsClone = new ConcurrentHashMap(clientSessionIds);
Map requestClients = new ConcurrentHashMap();
requestClients.put(ClientHolder.CLIENT_HOLDER_KEY, clientsClone);
requestClients.put(LeasePinger.LEASE_PINGER_ID, leasePingerId);
requestClients.put(TIME_STAMP, Long.toString(System.currentTimeMillis()));
InvocationRequest ir = new InvocationRequest(invokerSessionID, null, "$PING$", requestClients, null, null);
invoker.invoke(ir);
if(trace) { log.trace(this + " successfully pinged the server"); }