FlatFileSeq Class Reference

FlatFileSeq represents a sequence of numbered files storing raw data. More...

#include <flatfile.h>

Collaboration diagram for FlatFileSeq:

Public Member Functions
	FlatFileSeq (fs::path dir, const char *prefix, size_t chunk_size)
	Constructor.
fs::path	FileName (const FlatFilePos &pos) const
	Get the name of the file at the given position.
FILE *	Open (const FlatFilePos &pos, bool read_only=false)
	Open a handle to the file at the given position.
size_t	Allocate (const FlatFilePos &pos, size_t add_size, bool &out_of_space)
	Allocate additional space in a file after the given starting position.
bool	Flush (const FlatFilePos &pos, bool finalize=false)
	Commit a file to disk, and optionally truncate off extra pre-allocated bytes if final.

Private Attributes
const fs::path	m_dir
const char *const	m_prefix
const size_t	m_chunk_size

Detailed Description

FlatFileSeq represents a sequence of numbered files storing raw data.

This class facilitates access to and efficient management of these files.

Definition at line 49 of file flatfile.h.

Constructor & Destructor Documentation

FlatFileSeq()

FlatFileSeq::FlatFileSeq	(	fs::path	dir,
		const char *	prefix,
		size_t	chunk_size
	)

Constructor.

Parameters

dir	The base directory that all files live in.
prefix	A short prefix given to all file names.
chunk_size	Disk space is pre-allocated in multiples of this amount.

Definition at line 13 of file flatfile.cpp.

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Member Function Documentation

Allocate()

size_t FlatFileSeq::Allocate	(	const FlatFilePos &	pos,
		size_t	add_size,
		bool &	out_of_space
	)

Allocate additional space in a file after the given starting position.

The amount allocated will be the minimum multiple of the sequence chunk size greater than add_size.

Parameters

[in]	pos	The starting position that bytes will be allocated after.
[in]	add_size	The minimum number of bytes to be allocated.
[out]	out_of_space	Whether the allocation failed due to insufficient disk space.

Returns

The number of bytes successfully allocated.

Definition at line 51 of file flatfile.cpp.

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FileName()

fs::path FlatFileSeq::FileName

(

const FlatFilePos &

pos

)

const

Get the name of the file at the given position.

Definition at line 24 of file flatfile.cpp.

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Flush()

bool FlatFileSeq::Flush	(	const FlatFilePos &	pos,
		bool	finalize = false
	)

Commit a file to disk, and optionally truncate off extra pre-allocated bytes if final.

Parameters

[in]	pos	The first unwritten position in the file to be flushed.
[in]	finalize	True if no more data will be written to this file.

Returns

true on success, false on failure.

Definition at line 80 of file flatfile.cpp.

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Open()

FILE * FlatFileSeq::Open	(	const FlatFilePos &	pos,
		bool	read_only = false
	)

Open a handle to the file at the given position.

Definition at line 28 of file flatfile.cpp.

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Member Data Documentation

m_chunk_size

const size_t FlatFileSeq::m_chunk_size

private

Definition at line 53 of file flatfile.h.

m_dir

const fs::path FlatFileSeq::m_dir

private

Definition at line 51 of file flatfile.h.

m_prefix

const char* const FlatFileSeq::m_prefix

private

Definition at line 52 of file flatfile.h.

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The documentation for this class was generated from the following files:

• src/flatfile.h
• src/flatfile.cpp