gistfile1.aw

<?php
// how the session variable is used in the system module.

  if (isset($_SESSION['ignore_slave_server'])) {
    if ($_SESSION['ignore_slave_server'] >= REQUEST_TIME) {
      Database::ignoreTarget('default', 'slave');
    }
    else {
      unset($_SESSION['ignore_slave_server']);
    }
  }

// how it'used in the database class.
if (!empty(self::$ignoreTargets[$key][$target]) || !isset(self::$databaseInfo[$key][$target])) {
  $target = 'default';
}