if (log.isTraceEnabled()) { log.trace("removing callback handler: " + callbackHandler); }
if (trace) { log.trace("removing callback handler: " + callbackHandler); }
   public void removeListener(InvokerCallbackHandler callbackHandler)   {      if (log.isTraceEnabled()) { log.trace("removing callback handler: " + callbackHandler); }      synchronized(callbackHandlers)      {         for(Iterator i = callbackHandlers.keySet().iterator(); i.hasNext();)         {            Object key = i.next();            if (callbackHandler.equals(callbackHandlers.get(key)))            {               callbackHandlers.remove(key);               return;            }         }      }   }