BaseDump Class Reference

Readahead helper for making large MediaWiki data dumps; reads in a previous XML dump to sequentially prefetch text records already normalized and decompressed. More...

Public Member Functions
	__construct ( $infile)
	close ()
	debug ( $str)
	nextPage ()
	nextRev ()
	nextText ()
	nodeContents ()
	Shouldn't something like this be built-in to XMLReader? Fetches text contents of the current element, assuming no sub-elements or such scary things.
	prefetch ( $page, $rev)
	Attempts to fetch the text of a particular page revision from the dump stream.
	skipTo ( $name, $parent='page')

Protected Attributes
	$atEnd = false
	$atPageEnd = false
	$infiles = null
	$lastPage = 0
	$lastRev = 0
	$reader = null

Detailed Description

Readahead helper for making large MediaWiki data dumps; reads in a previous XML dump to sequentially prefetch text records already normalized and decompressed.

This can save load on the external database servers, hopefully.

Assumes that dumps will be recorded in the canonical order:

• ascending by page_id
• ascending by rev_id within each page
• text contents are immutable and should not change once recorded, so the previous dump is a reliable source

Definition at line 42 of file backupPrefetch.inc.

Constructor & Destructor Documentation

__construct()

BaseDump::__construct

(

$infile

)

Definition at line 50 of file backupPrefetch.inc.

Member Function Documentation

close()

BaseDump::close

(

)

Access:\n private

Returns

null

Definition at line 212 of file backupPrefetch.inc.

Referenced by nextPage(), nodeContents(), and skipTo().

debug()

BaseDump::debug

(

$str

)

Definition at line 100 of file backupPrefetch.inc.

References wfDebug().

Referenced by prefetch(), and skipTo().

nextPage()

BaseDump::nextPage

(

)

Access:\n private

Definition at line 109 of file backupPrefetch.inc.

References close(), nodeContents(), and skipTo().

Referenced by prefetch().

nextRev()

BaseDump::nextRev

(

)

Access:\n private

Definition at line 129 of file backupPrefetch.inc.

References nodeContents(), and skipTo().

Referenced by prefetch().

nextText()

BaseDump::nextText

(

)

Access:\n private

Returns

string

Definition at line 143 of file backupPrefetch.inc.

References nodeContents(), and skipTo().

Referenced by prefetch().

nodeContents()

BaseDump::nodeContents

(

)

Shouldn't something like this be built-in to XMLReader? Fetches text contents of the current element, assuming no sub-elements or such scary things.

Returns

string

Access:\n private

Definition at line 185 of file backupPrefetch.inc.

References $buffer, and close().

Referenced by nextPage(), nextRev(), and nextText().

prefetch()

BaseDump::prefetch	(		$page,
			$rev
	)

Attempts to fetch the text of a particular page revision from the dump stream.

May return null if the page is unavailable.

Parameters

int	$page	ID number of page to read
int	$rev	ID number of revision to read

Returns

string|null

Definition at line 70 of file backupPrefetch.inc.

References $page, $rev, debug(), nextPage(), nextRev(), and nextText().

skipTo()

BaseDump::skipTo	(		$name,
			$parent = 'page'
	)

Access:\n private

Parameters

string	$name
string	$parent

Returns

bool|null

Definition at line 155 of file backupPrefetch.inc.

References $name, close(), and debug().

Referenced by nextPage(), nextRev(), and nextText().

Member Data Documentation

$atEnd

BaseDump::$atEnd = false

protected

Definition at line 44 of file backupPrefetch.inc.

$atPageEnd

BaseDump::$atPageEnd = false

protected

Definition at line 45 of file backupPrefetch.inc.

$infiles

BaseDump::$infiles = null

protected

Definition at line 48 of file backupPrefetch.inc.

$lastPage

BaseDump::$lastPage = 0

protected

Definition at line 46 of file backupPrefetch.inc.

$lastRev

BaseDump::$lastRev = 0

protected

Definition at line 47 of file backupPrefetch.inc.

$reader

BaseDump::$reader = null

protected

Definition at line 43 of file backupPrefetch.inc.

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

• maintenance/backupPrefetch.inc