Generic callback interface used by RestTemplate's retrieval methods Implementations of this interfac
e perform the actual work of extracting data from a ClientHttpResponse, but don't need to worry about exception handling or closing resources.
Used internally by the RestTemplate, but also useful for application code. There is one available factory method, see RestTemplate#responseEntityExtractor(Type). @author Arjen Poutsma @since 3.0 @param the data type @see RestTemplate#execute