/** Closes all open sockets and stops the internal server thread that processes messages. */
 public void close() {
   ServerThread st = server;
   if (st != null) {
     st.close();
     try {
       st.join();
     } catch (InterruptedException ex) {
       logger.warn(ex);
     }
     server = null;
     for (Iterator it = sockets.values().iterator(); it.hasNext(); ) {
       SocketEntry entry = (SocketEntry) it.next();
       try {
         synchronized (entry) {
           entry.getSocket().close();
         }
         logger.debug("Socket to " + entry.getPeerAddress() + " closed");
       } catch (IOException iox) {
         // ingore
         logger.debug(iox);
       }
     }
     if (socketCleaner != null) {
       socketCleaner.cancel();
     }
     socketCleaner = null;
   }
 }
 private synchronized void timeoutSocket(SocketEntry entry) {
   if (connectionTimeout > 0) {
     socketCleaner.schedule(new SocketTimeout(entry), connectionTimeout);
   }
 }