IDBAccessObject.php

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<?php
interface IDBAccessObject {
    const READ_NORMAL = 0;
 
    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)
 
    const READ_EXCLUSIVE = self::READ_LOCKING | 4; // READ_LOCKING (3) and "FOR UPDATE" (4)
 
    const READ_LATEST_IMMUTABLE = 8;
 
    // Convenience constant for tracking how data was loaded (higher => higher QoS)
    const READ_NONE = -1; // not loaded yet (or the object was cleared)
}