code: protected String getFunctionDescription(String functionName) {
  
      String className = getClass().getSimpleName();
      StringBuilder buffer = new StringBuilder(functionName.length() + className.length() + 4);
      buffer.append(FUNCTION_NAME_PREFIX);
      buffer.append(functionName);
      buffer.append(" [");
      buffer.append(className);
      buffer.append("]");
      return buffer.toString();
    }
docs: This method gets a description of this function.
  
  @param functionName is the name under which this function was invoked.
  @return a string describing this function.