code: public ServiceInformation get(String key) {
          ServiceInformation info = null;
          long hash = algorithm.hash(key);
          //Find the first server with a hash key after this one
          final SortedMap<Long, ServiceInformation> tailMap = ring.tailMap(hash);
          //Wrap around to the beginning of the ring, if we went past the last one
          hash = tailMap.isEmpty() ? ring.firstKey() : tailMap.firstKey();
          info = ring.get(hash);
          return info;
      }
docs: Returns the appropriate server for the given key.
  
  Running time: O(1)
  
  @param key
  @throws java.util.NoSuchElementException if the ring is empty
  @return