- // Constants for object loading bitfield flags (higher => higher QoS)
- const READ_LATEST = 1; // read from the master
- const READ_LOCKING = 3; // READ_LATEST (1) and "LOCK IN SHARE MODE" (2)
- const READ_EXCLUSIVE = 7; // READ_LOCKING (3) and "FOR UPDATE" (4)
+ /** Constants for object loading bitfield flags (higher => higher QoS) */
+ /** @var int Read from a replica DB/non-quorum */
+ const READ_NORMAL = 0;
+ /** @var int Read from the master/quorum */
+ const READ_LATEST = 1;
+ /* @var int Read from the master/quorum and lock out other writers */
+ const READ_LOCKING = self::READ_LATEST | 2; // READ_LATEST (1) and "LOCK IN SHARE MODE" (2)
+ /** @var int Read from the master/quorum and lock out other writers and locking readers */
+ const READ_EXCLUSIVE = self::READ_LOCKING | 4; // READ_LOCKING (3) and "FOR UPDATE" (4)