Network::ReadCache Class Reference

Inheritance diagram for Network::ReadCache:

Public Member Functions
	ReadCache (FileSizeType knownsize=0)
	~ReadCache ()
virtual void	clearData ()
virtual void	setMinCacheSize (FileSizeType)
bool	isAvailable (FilePosType, FileSizeType) const
FileSizeType	getAt (FilePosType, BufType *, FileSizeType) const
FileChunkSetType	stillNeededDataFor (FilePosType, ChunkSizeType) const
bool	setData (FileChunkType, const BufType *)
	if fail, memory was full; now the cache is cleared More...
Public Member Functions inherited from Network::FileCache
virtual	~FileCache ()
FileSizeType	size () const
bool	isEmpty () const
BlockIdxType	blockIdx (FilePosType) const
BlockSizeType	blockSize (BlockIdxType) const
bool	validBlockIdx (BlockIdxType bidx) const
bool	isLiveBlock (BlockIdxType) const
BufType *	getBlock (BlockIdxType)
const BufType *	getBlock (BlockIdxType) const

Protected Member Functions
virtual void	handleNewLiveBlock (BlockIdxType)
Protected Member Functions inherited from Network::FileCache
	FileCache (FileSizeType)
Block *	gtBlk (BlockIdxType) const
void	dismissBlock (BlockIdxType)
void	clearBlocks ()
FilePosType	lastBlockPos () const
FilePosType	lastFilePos () const

Protected Attributes
TypeSet< BlockIdxType >	liveblockidxs_
BlockIdxType	maxnrliveblocks_
Protected Attributes inherited from Network::FileCache
ObjectSet< Block >	blocks_
const BlockSizeType	lastblocksz_
const FileSizeType	knownfilesize_

Additional Inherited Members
Public Types inherited from Network::FileCache
typedef unsigned char	BufType
typedef int	ChunkSizeType
typedef od_stream_Count	FileSizeType
typedef od_stream_Pos	FilePosType
typedef Interval< FilePosType >	FileChunkType
typedef TypeSet< FileChunkType >	FileChunkSetType
typedef ObjectSet< Block >::size_type	BlockIdxType
typedef Block::SizeType	BlockSizeType
Static Public Member Functions inherited from Network::FileCache
static FilePosType	blockStart (BlockIdxType)

Detailed Description

Write Cache.

When writing, we need a buffer to write data to. To allow jumping around a bit, we'll have to retain the first block (so a header can be updated later), and a couple of blocks before the last block. Therefore, the cache assumes writing steadily on, with maybe going back to the first block, or one of the near previous ones. Random jumping around may lead to bad stuff.

Constructor & Destructor Documentation

Network::ReadCache::ReadCache

(

FileSizeType

knownsize = 0

)

Network::ReadCache::~ReadCache

(

)

Member Function Documentation

virtual void Network::ReadCache::clearData ( )

virtual

Implements Network::FileCache.

FileSizeType Network::ReadCache::getAt	(	FilePosType	,
		BufType *	,
		FileSizeType
	)		const

virtual void Network::ReadCache::handleNewLiveBlock ( BlockIdxType  )

protectedvirtual

Reimplemented from Network::FileCache.

bool Network::ReadCache::isAvailable	(	FilePosType	,
		FileSizeType
	)		const

bool Network::ReadCache::setData	(	FileChunkType	,
		const BufType *
	)

if fail, memory was full; now the cache is cleared

virtual void Network::ReadCache::setMinCacheSize ( FileSizeType  )

virtual

Implements Network::FileCache.

FileChunkSetType Network::ReadCache::stillNeededDataFor	(	FilePosType	,
		ChunkSizeType
	)		const

Member Data Documentation

TypeSet<BlockIdxType> Network::ReadCache::liveblockidxs_

protected

BlockIdxType Network::ReadCache::maxnrliveblocks_

protected