class TFileCacheRead: public TObject

 Default Constructor.

 Creates a TFileCacheRead data structure.

 Destructor.

 Close out any threads or asynchronous fetches used by the underlying
 implementation.
 This is called by TFile::Close to prevent usage of the file handles
 after the closing of the file.

 Add block of length len at position pos in the list of blocks to
 be prefetched. If pos <= 0 the current blocks (if any) are reset.

 Print cache statistics, like
   ******TreeCache statistics for file: cms2.root ******
   Reading............................: 72761843 bytes in 7 transactions
   Readahead..........................: 256000 bytes with overhead = 0 bytes
   Average transaction................: 10394.549000 Kbytes
   Number of blocks in current cache..: 210, total size: 6280352

 if option = "a" the list of blocks in the cache is printed
 NB: this function is automatically called by TTreeCache::Print

 Read buffer at position pos.
 If pos is in the list of prefetched blocks read from fBuffer,
 otherwise need to make a normal read from file. Returns -1 in case of
 read error, 0 in case not in cache, 1 in case read from cache.

prefetch the first block

 Base function for ReadBuffer. Also gives out the position
 of the block in the internal buffer. This helps TTreeCacheUnzip to avoid
 doing twice the binary search

 Set the file using this cache and reset the current blocks (if any).

 Sort buffers to be prefetched in increasing order of positions.
 Merge consecutive blocks if necessary.

 Sort buffers to be prefetched in increasing order of positions.
 Merge consecutive blocks if necessary.
 Sort buffers to be prefetched in increasing order of positions.
 Merge consecutive blocks if necessary.

 Set the prefetching mode of this file.
 if 'setPrefetching', enable the asynchronous prefetching
 (using TFilePrefetch) and if the gEnv and rootrc
 variable Cache.Directory is set, also enable the local
 caching of the prefetched blocks.
 if 'setPrefetching', the old prefetcher is enabled is
 the gEnv and rootrc variable is TFile.AsyncReading

 TFileCacheRead implementation of SetEnablePrefetching.

 This function is called from the constructor and should not be virtual.