Network::FileCache Class Reference

Inheritance diagram for Network::FileCache:

Classes
class	Block

Public Types
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

Public Member Functions
virtual	~FileCache ()
FileSizeType	size () const
bool	isEmpty () const
virtual void	clearData ()=0
virtual void	setMinCacheSize (FileSizeType)=0
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

Static Public Member Functions
static FilePosType	blockStart (BlockIdxType)

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

Protected Attributes
ObjectSet< Block >	blocks_
const BlockSizeType	lastblocksz_
const FileSizeType	knownfilesize_

Detailed Description

< Cache for files in blocks of a couple of MBs. Not MT protected. Read Cache.

When reading, we need some buffering to avoid lots of HTTP requests. The idea if to stuff data into blocks, and keep track of the 'oldest' blocks so we can dump them as we go (we'll haveto, otherwise we end up holding the entire file in memory). As headers and trailers are often revisited, we will always keep the first and last block.

Member Typedef Documentation

typedef ObjectSet<Block>::size_type Network::FileCache::BlockIdxType

typedef Block::SizeType Network::FileCache::BlockSizeType

typedef unsigned char Network::FileCache::BufType

typedef int Network::FileCache::ChunkSizeType

typedef TypeSet<FileChunkType> Network::FileCache::FileChunkSetType

typedef Interval<FilePosType> Network::FileCache::FileChunkType

typedef od_stream_Pos Network::FileCache::FilePosType

typedef od_stream_Count Network::FileCache::FileSizeType

Constructor & Destructor Documentation

virtual Network::FileCache::~FileCache ( )

virtual

Network::FileCache::FileCache ( FileSizeType  )

protected

Member Function Documentation

BlockIdxType Network::FileCache::blockIdx

(

FilePosType

)

const

BlockSizeType Network::FileCache::blockSize

(

BlockIdxType

)

const

static FilePosType Network::FileCache::blockStart ( BlockIdxType  )

static

void Network::FileCache::clearBlocks ( )

protected

virtual void Network::FileCache::clearData ( )

pure virtual

Implemented in Network::WriteCache, and Network::ReadCache.

void Network::FileCache::dismissBlock ( BlockIdxType  )

protected

BufType* Network::FileCache::getBlock

(

BlockIdxType

)

const BufType* Network::FileCache::getBlock

(

BlockIdxType

)

const

Block* Network::FileCache::gtBlk ( BlockIdxType  ) const

protected

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

inlineprotectedvirtual

Reimplemented in Network::WriteCache, and Network::ReadCache.

bool Network::FileCache::isEmpty ( ) const

inline

bool Network::FileCache::isLiveBlock

(

BlockIdxType

)

const

FilePosType Network::FileCache::lastBlockPos ( ) const

inlineprotected

FilePosType Network::FileCache::lastFilePos ( ) const

inlineprotected

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

pure virtual

Implemented in Network::WriteCache, and Network::ReadCache.

FileSizeType Network::FileCache::size

(

)

const

bool Network::FileCache::validBlockIdx ( BlockIdxType  bidx ) const

inline

Member Data Documentation

ObjectSet<Block> Network::FileCache::blocks_

protected

const FileSizeType Network::FileCache::knownfilesize_

protected

const BlockSizeType Network::FileCache::lastblocksz_

protected