Allow extensions to run their own backlink-based updates:

* Introduce new hooks which allow BacklinkCache to handle non-core tables
* Make table name a parameter to RefreshLinks2 job (instead of hardcoded templatelinks)

docs/hooks.txt

@@ -564,6 +564,16 @@ $args: arguments
 $user: user
 $result: result of checking autopromote condition
 
+'BacklinkCacheGetPrefix': allows to set prefix for a spefific link table
+$table: table name
+&$prefix: prefix
+
+'BacklinkCacheGetConditions': allows to set conditions for query when links to certain title
+are fetched
+$table: table name
+$title: title of the page to which backlinks are sought
+&$conds: query conditions
+
 'BadImage': When checking against the bad image list
 $name: Image name being checked
 &$bad: Whether or not the image is "bad"

includes/BacklinkCache.php

@@ -190,7 +190,13 @@ class BacklinkCache {
 		if ( isset( $prefixes[$table] ) ) {
 			return $prefixes[$table];
 		} else {
-			throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
+			$prefix = null;
+			wfRunHooks( 'BacklinkCacheGetPrefix', array( $table, &$prefix ) );
+			if( $prefix ) {
+				return $prefix;
+			} else {
+				throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
+			}
 		}
 	}
 
@@ -237,7 +243,10 @@ class BacklinkCache {
 				);
 				break;
 			default:
-				throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
+				$conds = null;
+				wfRunHooks( 'BacklinkCacheGetConditions', array( $table, $this->title, &$conds ) );
+				if( !$conds )
+					throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
 		}
 
 		return $conds;

includes/LinksUpdate.php

@@ -241,6 +241,7 @@ class LinksUpdate {
 		foreach ( $batches as $batch ) {
 			list( $start, $end ) = $batch;
 			$params = array(
+				'table' => 'templatelinks',
 				'start' => $start,
 				'end' => $end,
 			);

includes/job/RefreshLinksJob.php

@@ -89,7 +89,7 @@ class RefreshLinksJob2 extends Job {
 			return false;
 		}
 		$titles = $this->title->getBacklinkCache()->getLinks( 
-			'templatelinks', $this->params['start'], $this->params['end']);
+			$this->params['table'], $this->params['start'], $this->params['end']);
 		
 		# Not suitable for page load triggered job running!
 		# Gracefully switch to refreshLinks jobs if this happens.