Merge "Fix the cache timestamp for forced updates."

[lhc/web/wiklou.git] / includes / Storage / SqlBlobStore.php

diff --git a/includes/Storage/SqlBlobStore.php b/includes/Storage/SqlBlobStore.php
index 48ffe2c..d7216c5 100644 (file)
--- a/includes/Storage/SqlBlobStore.php
+++ b/includes/Storage/SqlBlobStore.php
@@ -94,7 +94,12 @@ class SqlBlobStore implements IDBAccessObject, BlobStore {
 
        /**
         * @param LoadBalancer $dbLoadBalancer A load balancer for acquiring database connections
-        * @param WANObjectCache $cache A cache manager for caching blobs
+        * @param WANObjectCache $cache A cache manager for caching blobs. This can be the local
+        *        wiki's default instance even if $wikiId refers to a different wiki, since
+        *        makeGlobalKey() is used to constructed a key that allows cached blobs from the
+        *        same database to be re-used between wikis. For example, enwiki and frwiki will
+        *        use the same cache keys for blobs from the wikidatawiki database, regardless of
+        *        the cache's default key space.
         * @param bool|string $wikiId The ID of the target wiki database. Use false for the local wiki.
         */
        public function __construct(