code: @Override
    public MessageRepresentation getMessage(int commandCode, long applicationId, boolean isRequest) {
      if (!this.configured) {
        return null;
      }
      MessageRepresentation key = new MessageRepresentationImpl(commandCode, applicationId, isRequest);
      return this.commandMap.get(key);
    }
docs: /*
  (non-Javadoc)
  
  @see org.jdiameter.api.validation.Dictionary#getMessage(int, long, boolean)