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<?php
/**
* Cache for article titles (prefixed DB keys) and ids linked from one source
* @package MediaWiki
* @subpackage Cache
*/
/**
* @package MediaWiki
* @subpackage Cache
*/
class LinkCache {
// Increment $mClassVer whenever old serialized versions of this class
// becomes incompatible with the new version.
/* private */ var $mClassVer = 3;
/* private */ var $mPageLinks;
/* private */ var $mGoodLinks, $mBadLinks;
/* private */ var $mForUpdate;
/**
* Get an instance of this class
*/
static function &singleton() {
static $instance;
if ( !isset( $instance ) ) {
$instance = new LinkCache;
}
return $instance;
}
function LinkCache() {
$this->mForUpdate = false;
$this->mPageLinks = array();
$this->mGoodLinks = array();
$this->mBadLinks = array();
}
/* private */ function getKey( $title ) {
return wfMemcKey( 'lc', 'title', $title );
}
/**
* General accessor to get/set whether SELECT FOR UPDATE should be used
*/
function forUpdate( $update = NULL ) {
return wfSetVar( $this->mForUpdate, $update );
}
function getGoodLinkID( $title ) {
if ( array_key_exists( $title, $this->mGoodLinks ) ) {
return $this->mGoodLinks[$title];
} else {
return 0;
}
}
function isBadLink( $title ) {
return array_key_exists( $title, $this->mBadLinks );
}
function addGoodLinkObj( $id, $title ) {
$dbkey = $title->getPrefixedDbKey();
$this->mGoodLinks[$dbkey] = $id;
$this->mPageLinks[$dbkey] = $title;
}
function addBadLinkObj( $title ) {
$dbkey = $title->getPrefixedDbKey();
if ( ! $this->isBadLink( $dbkey ) ) {
$this->mBadLinks[$dbkey] = 1;
$this->mPageLinks[$dbkey] = $title;
}
}
function clearBadLink( $title ) {
unset( $this->mBadLinks[$title] );
$this->clearLink( $title );
}
function clearLink( $title ) {
global $wgMemc, $wgLinkCacheMemcached;
if( $wgLinkCacheMemcached )
$wgMemc->delete( $this->getKey( $title ) );
}
function getPageLinks() { return $this->mPageLinks; }
function getGoodLinks() { return $this->mGoodLinks; }
function getBadLinks() { return array_keys( $this->mBadLinks ); }
/**
* Add a title to the link cache, return the page_id or zero if non-existent
* @param $title String: title to add
* @return integer
*/
function addLink( $title ) {
$nt = Title::newFromDBkey( $title );
if( $nt ) {
return $this->addLinkObj( $nt );
} else {
return 0;
}
}
/**
* Add a title to the link cache, return the page_id or zero if non-existent
* @param $nt Title to add.
* @return integer
*/
function addLinkObj( &$nt ) {
global $wgMemc, $wgLinkCacheMemcached, $wgAntiLockFlags;
$title = $nt->getPrefixedDBkey();
if ( $this->isBadLink( $title ) ) { return 0; }
$id = $this->getGoodLinkID( $title );
if ( 0 != $id ) { return $id; }
$fname = 'LinkCache::addLinkObj';
global $wgProfiling, $wgProfiler;
if ( $wgProfiling && isset( $wgProfiler ) ) {
$fname .= ' (' . $wgProfiler->getCurrentSection() . ')';
}
wfProfileIn( $fname );
$ns = $nt->getNamespace();
$t = $nt->getDBkey();
if ( '' == $title ) {
wfProfileOut( $fname );
return 0;
}
$id = NULL;
if( $wgLinkCacheMemcached )
$id = $wgMemc->get( $key = $this->getKey( $title ) );
if( ! is_integer( $id ) ) {
if ( $this->mForUpdate ) {
$db =& wfGetDB( DB_MASTER );
if ( !( $wgAntiLockFlags & ALF_NO_LINK_LOCK ) ) {
$options = array( 'FOR UPDATE' );
} else {
$options = array();
}
} else {
$db =& wfGetDB( DB_SLAVE );
$options = array();
}
$id = $db->selectField( 'page', 'page_id',
array( 'page_namespace' => $ns, 'page_title' => $t ),
$fname, $options );
if ( !$id ) {
$id = 0;
}
if( $wgLinkCacheMemcached )
$wgMemc->add( $key, $id, 3600*24 );
}
if( 0 == $id ) {
$this->addBadLinkObj( $nt );
} else {
$this->addGoodLinkObj( $id, $nt );
}
wfProfileOut( $fname );
return $id;
}
/**
* Clears cache
*/
function clear() {
$this->mPageLinks = array();
$this->mGoodLinks = array();
$this->mBadLinks = array();
}
}
?>
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