public static void shutdown() {
    logger_.info("Shutting down ...");
    synchronized (MessagingService.class) {
      /* Stop listening on any socket */
      for (SelectionKey skey : listenSockets_.values()) {
        SelectorManager.getSelectorManager().cancel(skey);
      }
      listenSockets_.clear();

      /* Shutdown the threads in the EventQueue's */
      messageDeserializationExecutor_.shutdownNow();
      messageSerializerExecutor_.shutdownNow();
      messageDeserializerExecutor_.shutdownNow();
      streamExecutor_.shutdownNow();

      /* shut down the cachetables */
      taskCompletionMap_.shutdown();
      callbackMap_.shutdown();

      /* Interrupt the selector manager thread */
      SelectorManager.getSelectorManager().interrupt();

      poolTable_.clear();
      verbHandlers_.clear();
      bShutdown_ = true;
    }
    logger_.debug("Shutdown invocation complete.");
  }
 public static ConnectionStatistics[] getPoolStatistics() {
   Set<ConnectionStatistics> stats = new HashSet<ConnectionStatistics>();
   Iterator<TcpConnectionManager> it = poolTable_.values().iterator();
   while (it.hasNext()) {
     TcpConnectionManager cp = it.next();
     ConnectionStatistics cs =
         new ConnectionStatistics(
             cp.getLocalEndPoint(),
             cp.getRemoteEndPoint(),
             cp.getPoolSize(),
             cp.getConnectionsInUse());
     stats.add(cs);
   }
   return stats.toArray(new ConnectionStatistics[0]);
 }