From 183851b06bd6c52f3cae5375f433da720d410447 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 11 Oct 2006 18:12:39 +0000
Subject: MediaWiki 1.7.1 wiederhergestellt

---
 includes/LinkCache.php | 178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 includes/LinkCache.php

(limited to 'includes/LinkCache.php')

diff --git a/includes/LinkCache.php b/includes/LinkCache.php
new file mode 100644
index 00000000..451b3f0c
--- /dev/null
+++ b/includes/LinkCache.php
@@ -0,0 +1,178 @@
+<?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
+	 */
+	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 ) {
+		global $wgDBname;
+		return $wgDBname.':lc:title:'.$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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