meta::index::chunk< PrimaryKey, SecondaryKey > Class Template Reference

Represents a portion of a disk_index's postings file. More...

#include <chunk.h>

Public Member Functions
	chunk (const std::string &path)
bool	operator< (const chunk &other) const
uint64_t	size () const
std::string	path () const
void	merge_with (const chunk &other)
	After this function ends, the current chunk file will contain information from both chunks, and the "other" chunk file will be deleted. More...
template<class Container >
void	memory_merge_with (Container &pdata)

Private Member Functions
void	set_size ()
	Calculates the size of the file this chunk represents in bytes.

Private Attributes
std::string	path_
	The path to this chunk file on disk.
uint64_t	size_
	The number of bytes this chunk takes up.

Detailed Description

template<class PrimaryKey, class SecondaryKey>
class meta::index::chunk< PrimaryKey, SecondaryKey >

Represents a portion of a disk_index's postings file.

It is an intermediate file mapping primary keys to secondary keys. The chunks are sorted to enable efficient merging, and define an operator< to allow them to be sorted or stored in a priority queue.

Constructor & Destructor Documentation

template<class PrimaryKey , class SecondaryKey >

meta::index::chunk< PrimaryKey, SecondaryKey >::chunk

(

const std::string &

path

)

Parameters

path	The path to this chunk file on disk

Member Function Documentation

template<class PrimaryKey , class SecondaryKey >

bool meta::index::chunk< PrimaryKey, SecondaryKey >::operator<

(

const chunk< PrimaryKey, SecondaryKey > &

other

)

const

Parameters

other

The other chunk to compare with this one

Returns

whether this chunk is less than (has a smaller size than) the parameter

template<class PrimaryKey , class SecondaryKey >

uint64_t meta::index::chunk< PrimaryKey, SecondaryKey >::size

(

)

const

Returns

the size of this postings file chunk in bytes

template<class PrimaryKey , class SecondaryKey >

std::string meta::index::chunk< PrimaryKey, SecondaryKey >::path

(

)

const

Returns

the path to this chunk

template<class PrimaryKey , class SecondaryKey >

void meta::index::chunk< PrimaryKey, SecondaryKey >::merge_with

(

const chunk< PrimaryKey, SecondaryKey > &

other

)

After this function ends, the current chunk file will contain information from both chunks, and the "other" chunk file will be deleted.

Parameters

other

The other chunk to merge merge_with

template<class PrimaryKey , class SecondaryKey >

template<class Container >

void meta::index::chunk< PrimaryKey, SecondaryKey >::memory_merge_with

(

Container &

pdata

)

Parameters

pdata

A collection of postings data to combine with this chunk pdata must: support iteration in sorted order dereferenced type must be a postings_data<PrimaryKey, SecondaryKey> object implement the clear() function

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

• /home/chase/projects/meta/include/index/chunk.h
• /home/chase/projects/meta/include/index/chunk.tcc