code: public Class getReqClass(String service, String methodName) {
  
          String key = buildMethodKey(service, methodName);
          Class reqClass = requestClassCache.get(key);
          if (reqClass == null) {
              // 读取接口里的方法参数和返回值
              String interfaceClass = ConfigUniqueNameGenerator.getInterfaceName(service);
              Class clazz = ClassUtils.forName(interfaceClass, true);
              loadProtoClassToCache(key, clazz, methodName);
          }
          return requestClassCache.get(key);
      }
docs: 从缓存中获取请求值类
  
  @param service    接口名
  @param methodName 方法名
  @return 请求参数类