Merge "Define $wgAlwaysUseTidy to false where needed in unit tests"

[lhc/web/wiklou.git] / includes / BacklinkCache.php

diff --git a/includes/BacklinkCache.php b/includes/BacklinkCache.php
index 2aba29f..ba8691b 100644 (file)
--- a/includes/BacklinkCache.php
+++ b/includes/BacklinkCache.php
@@ -41,6 +41,8 @@
  * @internal documentation reviewed on 18 Mar 2011 by hashar
  */
 class BacklinkCache {
+       /** @var ProcessCacheLRU */
+       protected static $cache;
 
        /**
         * Multi dimensions array representing batches. Keys are:
@@ -81,12 +83,32 @@ class BacklinkCache {
 
        /**
         * Create a new BacklinkCache
-        * @param Title $title : Title object to create a backlink cache for.
+        *
+        * @param Title $title : Title object to create a backlink cache for
         */
-       function __construct( $title ) {
+       public function __construct( Title $title ) {
                $this->title = $title;
        }
 
+       /**
+        * Create a new BacklinkCache or reuse any existing one.
+        * Currently, only one cache instance can exist; callers that
+        * need multiple backlink cache objects should keep them in scope.
+        *
+        * @param Title $title : Title object to get a backlink cache for
+        * @return BacklinkCache
+        */
+       public static function get( Title $title ) {
+               if ( !self::$cache ) { // init cache
+                       self::$cache = new ProcessCacheLRU( 1 );
+               }
+               $dbKey = $title->getPrefixedDBkey();
+               if ( !self::$cache->has( $dbKey, 'obj' ) ) {
+                       self::$cache->set( $dbKey, 'obj', new self( $title ) );
+               }
+               return self::$cache->get( $dbKey, 'obj' );
+       }
+
        /**
         * Serialization handler, diasallows to serialize the database to prevent
         * failures after this class is deserialized from cache with dead DB
@@ -195,6 +217,7 @@ class BacklinkCache {
        /**
         * Get the field name prefix for a given table
         * @param $table String
+        * @throws MWException
         * @return null|string
         */
        protected function getPrefix( $table ) {
@@ -223,6 +246,7 @@ class BacklinkCache {
         * Get the SQL condition array for selecting backlinks, with a join
         * on the page table.
         * @param $table String
+        * @throws MWException
         * @return array|null
         */
        protected function getConditions( $table ) {
@@ -265,8 +289,9 @@ class BacklinkCache {
                        default:
                                $conds = null;
                                wfRunHooks( 'BacklinkCacheGetConditions', array( $table, $this->title, &$conds ) );
-                               if( !$conds )
+                               if( !$conds ) {
                                        throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
+                               }
                }
 
                return $conds;
@@ -303,7 +328,7 @@ class BacklinkCache {
         */
        public function partition( $table, $batchSize ) {
 
-               // 1) try partition cache ... 
+               // 1) try partition cache ...
 
                if ( isset( $this->partitionCache[$table][$batchSize] ) ) {
                        wfDebug( __METHOD__ . ": got from partition cache\n" );
@@ -358,7 +383,8 @@ class BacklinkCache {
         * Partition a DB result with backlinks in it into batches
         * @param $res ResultWrapper database result
         * @param $batchSize integer
-        * @return array @see 
+        * @throws MWException
+        * @return array @see
         */
        protected function partitionResult( $res, $batchSize ) {
                $batches = array();