code: String computeCacheKey(Class cls, String methodName, String argpart) {
  		String cachekey = keyMaker.getMd5(cls.getName() + "." + methodName);
  		if (!argpart.isEmpty()) {
  			cachekey += "_" + keyMaker.getMd5(argpart);
  		}
  		logger.debug("CACHEID : {}.{}_{} = {}", cls.getName(), methodName, argpart, cachekey);
  		return cachekey;
  	}
docs: Compute the cache key from classname, methodname, and args
  
  @param cls
  @param methodName
  @param argpart
  @return