public static <T> T load(Class<T> clazz, Config config, String configKey) {
        String dynamicServiceName = config.getParameter(configKey);
        String identity = config.getIdentity();
        if(StringUtils.isEmpty(identity)){
            throw new IllegalArgumentException("config.identity should not be null");
        }
        return load(clazz, dynamicServiceName, identity);
    }
@author Robert HG (254963746@qq.com)on 12/23/15.
lts-core/src/main/java/com/github/ltsopensource/core/spi/ServiceLoader.java