code: public Future<UpdateItemResult> updateItemAsync(final UpdateItemRequest updateItemRequest) 
              throws AmazonServiceException, AmazonClientException {
          return executorService.submit(new Callable<UpdateItemResult>() {
              public UpdateItemResult call() throws Exception {
                  return updateItem(updateItemRequest);
  		    }
  		});
      }
docs: <p>
  Edits an existing item's attributes.
  </p>
  <p>
  You can perform a conditional update (insert a new attribute
  name-value pair if it doesn't exist, or replace an existing name-value
  pair if it has certain expected attribute values).
  </p>
  
  @param updateItemRequest Container for the necessary parameters to
  execute the UpdateItem operation on AmazonDynamoDB.
  
  @return A Java Future object containing the response from the
  UpdateItem service method, as returned by AmazonDynamoDB.
  
  @throws AmazonClientException
  If any internal errors are encountered inside the client while
  attempting to make the request or handle the response.  For example
  if a network connection is not available.
  @throws AmazonServiceException
  If an error response is returned by AmazonDynamoDB indicating
  either a problem with the data in the request, or a server side issue.