public RegistryConfig setParameter(String key, String value) {
        if (parameters == null) {
            parameters = new ConcurrentHashMap<String, String>();
        }
        parameters.put(key, value);
        return this;
    }
Sets parameter.

@param key   the key
@param value the value
@return the RegistryConfig
core/api/src/main/java/com/alipay/sofa/rpc/config/RegistryConfig.java