code: public static DoradusClient open(String host, int port, Credentials credentials, String applicationName) {  
          DoradusClient doradusClient = new DoradusClient(host, port, null, credentials, applicationName);    
          doradusClient.setCredentials(credentials);
          String storageService = lookupStorageServiceByApp(doradusClient.getRestClient(), applicationName);
          doradusClient.setStorageService(storageService);
          return doradusClient;
      }
docs: Static factory method to open a 'dory' client session
  @param host Doradus Server host name or IP address.
  @param port Doradus Server port number.
  @param applicationName
  @return the instance of the DoradusClient session