class DynamoDBClientFetcherImpl implements DynamoDBClientFetcher {

    String getAWSRegion(final String settingRegion) {
        if (StringUtil.isEmpty(settingRegion)) {
            if (defaultAwsRegion == null) {
                defaultAwsRegion = EC2MetadataUtils.getEC2InstanceRegion();
            }
            return defaultAwsRegion;
        } else {
            return settingRegion;
        }
    }

    public  DynamoDBClientFetcherImpl();
    public  DynamoDBClientFetcherImpl(String defaultAwsRegion);

}