objectcache: use INTERIM_KEY_TTL constant in WANObjectCache for readability

Change-Id: I13936397def11a13849fe14491b752dd797f6759

diff --git a/includes/libs/objectcache/WANObjectCache.php b/includes/libs/objectcache/WANObjectCache.php
index 727e3c1..db27e42 100644 (file)
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -111,6 +111,9 @@ class WANObjectCache implements IExpiringStore, LoggerAwareInterface {
 
        /** Seconds to keep dependency purge keys around */
        const CHECK_KEY_TTL = self::TTL_YEAR;
+       /** Seconds to keep interim value keys for tombstoned keys around */
+       const INTERIM_KEY_TTL = 1;
+
        /** Seconds to keep lock keys around */
        const LOCK_TTL = 10;
        /** Default remaining TTL at which to consider pre-emptive regeneration */
@@ -1009,7 +1012,7 @@ class WANObjectCache implements IExpiringStore, LoggerAwareInterface {
                $isTombstone = ( $curTTL !== null && $value === false );
                if ( $isTombstone && $lockTSE <= 0 ) {
                        // Use the INTERIM value for tombstoned keys to reduce regeneration load
-                       $lockTSE = 1;
+                       $lockTSE = self::INTERIM_KEY_TTL;
                }
                // Assume a key is hot if requested soon after invalidation
                $isHot = ( $curTTL !== null && $curTTL <= 0 && abs( $curTTL ) <= $lockTSE );