protected Object getMethodParam(String methodName, String paramKey) {
        if (CommonUtils.isEmpty(configContext)) {
            return null;
        }
        Object o = configContext.get(buildMethodKey(methodName, paramKey));
        return o == null ? configContext.get(paramKey) : o;
    }
Buildmkey string.

@param methodName the method name
@param key        the key
@return the string
core/api/src/main/java/com/alipay/sofa/rpc/filter/FilterInvoker.java