private void addVNXFailedSubscription(String storageSystemURI){
  if (StringUtils.isNotEmpty(storageSystemURI)) {
    FAILED_VNXFILE_SUBSCRIPTION.add(storageSystemURI);
  }
}

private void addVNXFailedSubscription ( String storageSystemURI ) { if ( StringUtils . isNotEmpty ( storageSystemURI ) ) { FAILED_VNXFILE_SUBSCRIPTION . add ( storageSystemURI ) ; } }
adds vnxfile ' s uri into failed cache . so that subscription will happen through scheduled monitoring
