1 files changed, 15 insertions, 0 deletions
diff --git a/includes/filerepo/ForeignDBViaLBRepo.php b/includes/filerepo/ForeignDBViaLBRepo.php
index 13c9f434..80325752 100644
--- a/includes/filerepo/ForeignDBViaLBRepo.php
+++ b/includes/filerepo/ForeignDBViaLBRepo.php
@@ -27,6 +27,21 @@ class ForeignDBViaLBRepo extends LocalRepo {
 		return $this->hasSharedCache;
 	}
 
+	/**
+	 * Get a key on the primary cache for this repository.
+	 * Returns false if the repository's cache is not accessible at this site. 
+	 * The parameters are the parts of the key, as for wfMemcKey().
+	 */
+	function getSharedCacheKey( /*...*/ ) {
+		if ( $this->hasSharedCache() ) {
+			$args = func_get_args();
+			array_unshift( $args, $this->wiki );
+			return implode( ':', $args );
+		} else {
+			return false;
+		}
+	}
+
 	function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 		throw new MWException( get_class($this) . ': write operations are not supported' );
 	}