includes/objectcache/EmptyBagOStuff.php

   1 <?php
   2 /**
   3  * Dummy object caching.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Cache
  22  */
  23
  24 /**
  25  * A BagOStuff object with no objects in it. Used to provide a no-op object to calling code.
  26  *
  27  * @ingroup Cache
  28  */
  29 class EmptyBagOStuff extends BagOStuff {
  30
  31         /**
  32          * @param string $key
  33          * @param mixed $casToken [optional]
  34          * @return bool
  35          */
  36         public function get( $key, &$casToken = null ) {
  37                 return false;
  38         }
  39
  40         /**
  41          * @param string $key
  42          * @param mixed $value
  43          * @param int $exp
  44          * @return bool
  45          */
  46         public function set( $key, $value, $exp = 0 ) {
  47                 return true;
  48         }
  49
  50         /**
  51          * @param mixed $casToken
  52          * @param string $key
  53          * @param mixed $value
  54          * @param int $exp
  55          * @return bool
  56          */
  57         protected function cas( $casToken, $key, $value, $exp = 0 ) {
  58                 return true;
  59         }
  60
  61         /**
  62          * @param string $key
  63          * @return bool
  64          */
  65         public function delete( $key ) {
  66                 return true;
  67         }
  68
  69         /**
  70          * @param string $key
  71          * @param callable $callback Callback method to be executed
  72          * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
  73          * @param int $attempts The amount of times to attempt a merge in case of failure
  74          * @return bool Success
  75          */
  76         public function merge( $key, $callback, $exptime = 0, $attempts = 10 ) {
  77                 return true;
  78         }
  79 }