This class contains the cache operations for GridJs. User shall implement his own business logic for storage based on it..
public class GridCacheForStream
|Implements this method to get the file url from the cache.
|Checks whether the cache with uid is existed
|Implements this method to load cache with the key uid,return the stream from the cache.
|virtual SaveStream(Stream, string)
|Implements this method to save cache,save the stream to the cache with the key uid.