-<?
-# Cache for article titles and ids linked from one source
-
-# These are used in incrementalSetup()
-define ('LINKCACHE_GOOD', 0);
-define ('LINKCACHE_BAD', 1);
-define ('LINKCACHE_IMAGE', 2);
-
-class LinkCache {
+<?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 = 1;
+ /* private */ var $mClassVer = 3;
+
+ /* private */ var $mPageLinks;
+ /* private */ var $mGoodLinks, $mBadLinks;
+ /* private */ var $mForUpdate;
+
+ /**
+ * Get an instance of this class
+ */
+ 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 */ var $mGoodLinks, $mBadLinks, $mActive;
- /* private */ var $mImageLinks;
- /* private */ var $mPreFilled, $mOldGoodLinks, $mOldBadLinks;
-
/* private */ function getKey( $title ) {
global $wgDBname;
- return "$wgDBname:lc:title:$title";
+ return $wgDBname.':lc:title:'.$title;
}
-
- function LinkCache()
- {
- $this->mActive = true;
- $this->mPreFilled = false;
- $this->mGoodLinks = array();
- $this->mBadLinks = array();
- $this->mImageLinks = array();
- $this->mOldGoodLinks = array();
- $this->mOldBadLinks = array();
+
+ /**
+ * General accessor to get/set whether SELECT FOR UPDATE should be used
+ */
+ function forUpdate( $update = NULL ) {
+ return wfSetVar( $this->mForUpdate, $update );
}
- function getGoodLinkID( $title )
- {
+ function getGoodLinkID( $title ) {
if ( array_key_exists( $title, $this->mGoodLinks ) ) {
return $this->mGoodLinks[$title];
} else {
}
}
- function isBadLink( $title )
- {
- return array_key_exists( $title, $this->mBadLinks );
+ function isBadLink( $title ) {
+ return array_key_exists( $title, $this->mBadLinks );
}
- function addGoodLink( $id, $title )
- {
- if ( $this->mActive ) {
- $this->mGoodLinks[$title] = $id;
- }
+ function addGoodLinkObj( $id, $title ) {
+ $dbkey = $title->getPrefixedDbKey();
+ $this->mGoodLinks[$dbkey] = $id;
+ $this->mPageLinks[$dbkey] = $title;
}
- function addBadLink( $title )
- {
- if ( $this->mActive && ( ! $this->isBadLink( $title ) ) ) {
- $this->mBadLinks[$title] = 1;
+ function addBadLinkObj( $title ) {
+ $dbkey = $title->getPrefixedDbKey();
+ if ( ! $this->isBadLink( $dbkey ) ) {
+ $this->mBadLinks[$dbkey] = 1;
+ $this->mPageLinks[$dbkey] = $title;
}
}
- function addImageLink( $title )
- {
- if ( $this->mActive ) { $this->mImageLinks[$title] = 1; }
- }
-
- function addImageLinkObj( $nt )
- {
- if ( $this->mActive ) { $this->mImageLinks[$nt->getDBkey()] = 1; }
- }
-
- function clearBadLink( $title )
- {
+ function clearBadLink( $title ) {
unset( $this->mBadLinks[$title] );
$this->clearLink( $title );
}
-
- function clearLink( $title )
- {
+
+ function clearLink( $title ) {
global $wgMemc, $wgLinkCacheMemcached;
if( $wgLinkCacheMemcached )
$wgMemc->delete( $this->getKey( $title ) );
}
- function suspend() { $this->mActive = false; }
- function resume() { $this->mActive = true; }
+ function getPageLinks() { return $this->mPageLinks; }
function getGoodLinks() { return $this->mGoodLinks; }
function getBadLinks() { return array_keys( $this->mBadLinks ); }
- function getImageLinks() { return $this->mImageLinks; }
- function addLink( $title )
- {
+ /**
+ * Add a title to the link cache, return the page_id or zero if non-existent
+ * @param string $title Title to add
+ * @return integer
+ */
+ function addLink( $title ) {
$nt = Title::newFromDBkey( $title );
if( $nt ) {
return $this->addLinkObj( $nt );
return 0;
}
}
-
- function addLinkObj( &$nt )
- {
+
+ /**
+ * Add a title to the link cache, return the page_id or zero if non-existent
+ * @param Title $nt Title to add
+ * @return integer
+ */
+ function addLinkObj( &$nt ) {
+ global $wgMemc, $wgLinkCacheMemcached, $wgAntiLockFlags;
$title = $nt->getPrefixedDBkey();
- if ( $this->isBadLink( $title ) ) { return 0; }
+ if ( $this->isBadLink( $title ) ) { return 0; }
$id = $this->getGoodLinkID( $title );
if ( 0 != $id ) { return $id; }
- global $wgMemc;
- $fname = "LinkCache::addLinkObj";
+ $fname = 'LinkCache::addLinkObj';
+ global $wgProfiling, $wgProfiler;
+ if ( $wgProfiling && isset( $wgProfiler ) ) {
+ $fname .= ' (' . $wgProfiler->getCurrentSection() . ')';
+ }
+
wfProfileIn( $fname );
$ns = $nt->getNamespace();
$t = $nt->getDBkey();
- if ( "" == $title ) {
+ if ( '' == $title ) {
wfProfileOut( $fname );
- return 0;
+ return 0;
}
-
- $id = FALSE;
+
+ $id = NULL;
if( $wgLinkCacheMemcached )
$id = $wgMemc->get( $key = $this->getKey( $title ) );
- if( $id === FALSE ) {
- $sql = "SELECT cur_id FROM cur WHERE cur_namespace=" .
- "{$ns} AND cur_title='" . wfStrencode( $t ) . "'";
- $res = wfQuery( $sql, DB_READ, "LinkCache::addLink" );
+ 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();
+ }
- if ( 0 == wfNumRows( $res ) ) {
+ $id = $db->selectField( 'page', 'page_id',
+ array( 'page_namespace' => $ns, 'page_title' => $t ),
+ $fname, $options );
+ if ( !$id ) {
$id = 0;
- } else {
- $s = wfFetchObject( $res );
- $id = $s->cur_id;
}
if( $wgLinkCacheMemcached )
- $wgMemc->add( $key, $id, time()+3600 );
+ $wgMemc->add( $key, $id, 3600*24 );
}
-
- if ( 0 == $id ) { $this->addBadLink( $title ); }
- else { $this->addGoodLink( $id, $title ); }
- wfProfileOut( $fname );
- return $id;
- }
-
- function preFill( &$fromtitle )
- {
- global $wgEnablePersistentLC, $wgCompressedPersistentLC;
-
- $fname = "LinkCache::preFill";
- wfProfileIn( $fname );
- # Note -- $fromtitle is a Title *object*
- $dbkeyfrom = wfStrencode( $fromtitle->getPrefixedDBKey() );
-
- if ( $wgEnablePersistentLC ) {
- $cc =& $this->getFromLinkscc( $dbkeyfrom );
- if( $cc != FALSE ){
- $this->mOldGoodLinks = $this->mGoodLinks = $cc->mGoodLinks;
- $this->mOldBadLinks = $this->mBadLinks = $cc->mBadLinks;
- $this->mPreFilled = true;
- wfProfileOut( $fname );
- wfDebug( "LinkCache::preFill - got from linkscc\n" );
- return;
- }
- }
-
- $sql = "SELECT cur_id,cur_namespace,cur_title
- FROM cur,links
- WHERE cur_id=l_to AND l_from='{$dbkeyfrom}'";
- $res = wfQuery( $sql, DB_READ, $fname );
- while( $s = wfFetchObject( $res ) ) {
- $this->addGoodLink( $s->cur_id,
- Title::makeName( $s->cur_namespace, $s->cur_title )
- );
- }
-
- $this->suspend();
- $id = $fromtitle->getArticleID();
- $this->resume();
-
- $sql = "SELECT bl_to
- FROM brokenlinks
- WHERE bl_from='{$id}'";
- $res = wfQuery( $sql, DB_READ, "LinkCache::preFill" );
- while( $s = wfFetchObject( $res ) ) {
- $this->addBadLink( $s->bl_to );
- }
-
- $this->mOldBadLinks = $this->mBadLinks;
- $this->mOldGoodLinks = $this->mGoodLinks;
- $this->mPreFilled = true;
-
- if ( $wgEnablePersistentLC ) {
- // put fetched link data into cache
- if( $wgCompressedPersistentLC and function_exists( "gzcompress" ) ) {
- $ser = wfStrencode( gzcompress( serialize( $this ), 3 ));
- } else {
- $ser = wfStrencode( serialize( $this ) );
- }
- wfQuery("REPLACE INTO linkscc VALUES({$id}, '{$dbkeyfrom}', '{$ser}')",
- DB_WRITE);
- wfDebug( "LinkCache::preFill - saved to linkscc\n" );
+ if( 0 == $id ) {
+ $this->addBadLinkObj( $nt );
+ } else {
+ $this->addGoodLinkObj( $id, $nt );
}
-
wfProfileOut( $fname );
+ return $id;
}
- function getGoodAdditions()
- {
- return array_diff( $this->mGoodLinks, $this->mOldGoodLinks );
- }
-
- function getBadAdditions()
- {
- #wfDebug( "mOldBadLinks: " . implode( ', ', array_keys( $this->mOldBadLinks ) ) . "\n" );
- #wfDebug( "mBadLinks: " . implode( ', ', array_keys( $this->mBadLinks ) ) . "\n" );
- return array_values( array_diff( array_keys( $this->mBadLinks ), array_keys( $this->mOldBadLinks ) ) );
- }
-
- function getImageAdditions()
- {
- return array_diff_assoc( $this->mImageLinks, $this->mOldImageLinks );
- }
-
- function getGoodDeletions()
- {
- return array_diff( $this->mOldGoodLinks, $this->mGoodLinks );
- }
-
- function getBadDeletions()
- {
- return array_values( array_diff( array_keys( $this->mOldBadLinks ), array_keys( $this->mBadLinks ) ));
- }
-
- function getImageDeletions()
- {
- return array_diff_assoc( $this->mOldImageLinks, $this->mImageLinks );
- }
-
- # Parameters: $which is one of the LINKCACHE_xxx constants, $del and $add are
- # the incremental update arrays which will be filled. Returns whether or not it's
- # worth doing the incremental version. For example, if [[List of mathematical topics]]
- # was blanked, it would take a long, long time to do incrementally.
- function incrementalSetup( $which, &$del, &$add )
- {
- if ( ! $this->mPreFilled ) {
- return false;
- }
-
- switch ( $which ) {
- case LINKCACHE_GOOD:
- $old =& $this->mOldGoodLinks;
- $cur =& $this->mGoodLinks;
- $del = $this->getGoodDeletions();
- $add = $this->getGoodAdditions();
- break;
- case LINKCACHE_BAD:
- $old =& $this->mOldBadLinks;
- $cur =& $this->mBadLinks;
- $del = $this->getBadDeletions();
- $add = $this->getBadAdditions();
- break;
- default: # LINKCACHE_IMAGE
- return false;
- }
-
- return true;
- }
-
- # Clears cache but leaves old preFill copies alone
- function clear()
- {
+ /**
+ * Clears cache
+ */
+ function clear() {
+ $this->mPageLinks = array();
$this->mGoodLinks = array();
$this->mBadLinks = array();
- $this->mImageLinks = array();
- }
-
-
- function &getFromLinkscc( $dbkeyfrom ){
- $res = wfQuery("SELECT lcc_cacheobj FROM linkscc WHERE lcc_title = '{$dbkeyfrom}'",
- DB_READ);
- $row = wfFetchObject( $res );
- if( $row == FALSE)
- return false;
-
- $cacheobj = false;
- if( function_exists( "gzuncompress" ) )
- $cacheobj = @gzuncompress( $row->lcc_cacheobj );
-
- if($cacheobj == FALSE){
- $cacheobj = $row->lcc_cacheobj;
- }
- $cc = @unserialize( $cacheobj );
- if( isset( $cc->mClassVer ) and ($cc->mClassVer == $this->mClassVer ) ){
- return $cc;
- } else {
- return FALSE;
- }
}
}
?>
dépôts / lhc / web / wiklou.git / blobdiff