code: public StorageService findStorageService(String serviceName) {
          Utils.require(m_bInitialized, "DoradusService has not yet initialized");
          for (StorageService service : m_storageServices) {
              if (service.getClass().getSimpleName().equals(serviceName)) {
                  return service;
              }
          }
          return null;
      }
docs: Find a registered storage service with the given name. If there is no storage
  service with the registered name, null is returned. This method can only be called
  after the DoradusServer has initialized.
  
  @param serviceName   Name of the storage service to find. This is the same as the
  class's "simple" name. For example, if the class name is
  "com.dell.doradus.service.spider.SpiderService", the service
  name is just "SpiderService".
  @return              Singleton instance of the given service name if it is
  registered, otherwise null.