Merge "Add ILBFactory interface for completeness"

diff --combined includes/libs/rdbms/loadbalancer/ILoadBalancer.php
index cd51e66,54d8203..48c38f1
--- 1/includes/libs/rdbms/loadbalancer/ILoadBalancer.php
--- 2/includes/libs/rdbms/loadbalancer/ILoadBalancer.php
+++ b/includes/libs/rdbms/loadbalancer/ILoadBalancer.php
@@@ -60,9 -60,9 +60,9 @@@
   *   - Read-only archive clones: set 'is static' in the server configuration maps. This will
   *      treat all such DBs as having 0 lag.
   *   - SQL load balancing proxy: any proxy should handle lag checks on its own, so the 'max lag'
-  *     parameter should probably be set to INF in the server configuration maps. This will make
-  *     the load balancer ignore whatever it detects as the lag of the logical replica is (which
-  *     would probably just randomly bounce around).
+  *      parameter should probably be set to INF in the server configuration maps. This will make
+  *      the load balancer ignore whatever it detects as the lag of the logical replica is (which
+  *      would probably just randomly bounce around).
   *
   * If using a SQL proxy service, it would probably be best to have two proxy hosts for the
   * load balancer to talk to. One would be the 'host' of the master server entry and another for
@@@ -73,11 -73,6 +73,11 @@@
   * @ingroup Database
   */
  interface ILoadBalancer {
 +      /** @var integer Request a replica DB connection */
 +      const DB_REPLICA = -1;
 +      /** @var integer Request a master DB connection */
 +      const DB_MASTER = -2;
 +
        /**
         * Construct a manager of IDatabase connection objects
         *