includes/objectcache/HashBagOStuff.php

   1 <?php
   2 /**
   3  * Object caching using PHP arrays.
   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  * This is a test of the interface, mainly. It stores things in an associative
  26  * array, which is not going to persist between program runs.
  27  *
  28  * @ingroup Cache
  29  */
  30 class HashBagOStuff extends BagOStuff {
  31         /** @var array */
  32         protected $bag;
  33
  34         function __construct() {
  35                 $this->bag = array();
  36         }
  37
  38         /**
  39          * @param string $key
  40          * @return bool
  41          */
  42         protected function expire( $key ) {
  43                 $et = $this->bag[$key][1];
  44
  45                 if ( ( $et == 0 ) || ( $et > time() ) ) {
  46                         return false;
  47                 }
  48
  49                 $this->delete( $key );
  50
  51                 return true;
  52         }
  53
  54         /**
  55          * @param string $key
  56          * @param mixed $casToken [optional]
  57          * @return bool|mixed
  58          */
  59         function get( $key, &$casToken = null ) {
  60                 if ( !isset( $this->bag[$key] ) ) {
  61                         return false;
  62                 }
  63
  64                 if ( $this->expire( $key ) ) {
  65                         return false;
  66                 }
  67
  68                 $casToken = serialize( $this->bag[$key][0] );
  69
  70                 return $this->bag[$key][0];
  71         }
  72
  73         /**
  74          * @param string $key
  75          * @param mixed $value
  76          * @param int $exptime
  77          * @return bool
  78          */
  79         function set( $key, $value, $exptime = 0 ) {
  80                 $this->bag[$key] = array( $value, $this->convertExpiry( $exptime ) );
  81                 return true;
  82         }
  83
  84         /**
  85          * @param mixed $casToken
  86          * @param string $key
  87          * @param mixed $value
  88          * @param int $exptime
  89          * @return bool
  90          */
  91         function cas( $casToken, $key, $value, $exptime = 0 ) {
  92                 if ( serialize( $this->get( $key ) ) === $casToken ) {
  93                         return $this->set( $key, $value, $exptime );
  94                 }
  95
  96                 return false;
  97         }
  98
  99         /**
 100          * @param string $key
 101          * @param int $time
 102          * @return bool
 103          */
 104         function delete( $key, $time = 0 ) {
 105                 if ( !isset( $this->bag[$key] ) ) {
 106                         return false;
 107                 }
 108
 109                 unset( $this->bag[$key] );
 110
 111                 return true;
 112         }
 113 }