includes/libs/objectcache/MemcachedPhpBagOStuff.php

   1 <?php
   2 /**
   3  * Object caching using memcached.
   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 wrapper class for the pure-PHP memcached client, exposing a BagOStuff interface.
  26  *
  27  * @ingroup Cache
  28  */
  29 class MemcachedPhpBagOStuff extends MemcachedBagOStuff {
  30         /** @var MemcachedClient */
  31         protected $client;
  32
  33         /**
  34          * Available parameters are:
  35          *   - servers:             The list of IP:port combinations holding the memcached servers.
  36          *   - persistent:          Whether to use a persistent connection
  37          *   - compress_threshold:  The minimum size an object must be before it is compressed
  38          *   - timeout:             The read timeout in microseconds
  39          *   - connect_timeout:     The connect timeout in seconds
  40          *
  41          * @param array $params
  42          */
  43         function __construct( $params ) {
  44                 parent::__construct( $params );
  45
  46                 // Default class-specific parameters
  47                 $params += [
  48                         'compress_threshold' => 1500,
  49                         'connect_timeout' => 0.5
  50                 ];
  51
  52                 $this->client = new MemcachedClient( $params );
  53                 $this->client->set_servers( $params['servers'] );
  54         }
  55
  56         public function setDebug( $debug ) {
  57                 $this->client->set_debug( $debug );
  58         }
  59
  60         protected function doGet( $key, $flags = 0, &$casToken = null ) {
  61                 $casToken = null;
  62
  63                 return $this->client->get( $this->validateKeyEncoding( $key ), $casToken );
  64         }
  65
  66         protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) {
  67                 return $this->client->set(
  68                         $this->validateKeyEncoding( $key ),
  69                         $value,
  70                         $this->fixExpiry( $exptime )
  71                 );
  72         }
  73
  74         protected function doDelete( $key, $flags = 0 ) {
  75                 return $this->client->delete( $this->validateKeyEncoding( $key ) );
  76         }
  77
  78         public function add( $key, $value, $exptime = 0, $flags = 0 ) {
  79                 return $this->client->add(
  80                         $this->validateKeyEncoding( $key ),
  81                         $value,
  82                         $this->fixExpiry( $exptime )
  83                 );
  84         }
  85
  86         protected function cas( $casToken, $key, $value, $exptime = 0, $flags = 0 ) {
  87                 return $this->client->cas(
  88                         $casToken,
  89                         $this->validateKeyEncoding( $key ),
  90                         $value,
  91                         $this->fixExpiry( $exptime )
  92                 );
  93         }
  94
  95         public function incr( $key, $value = 1 ) {
  96                 $n = $this->client->incr( $this->validateKeyEncoding( $key ), $value );
  97
  98                 return ( $n !== false && $n !== null ) ? $n : false;
  99         }
 100
 101         public function decr( $key, $value = 1 ) {
 102                 $n = $this->client->decr( $this->validateKeyEncoding( $key ), $value );
 103
 104                 return ( $n !== false && $n !== null ) ? $n : false;
 105         }
 106
 107         protected function doChangeTTL( $key, $exptime, $flags ) {
 108                 return $this->client->touch(
 109                         $this->validateKeyEncoding( $key ),
 110                         $this->fixExpiry( $exptime )
 111                 );
 112         }
 113
 114         protected function doGetMulti( array $keys, $flags = 0 ) {
 115                 foreach ( $keys as $key ) {
 116                         $this->validateKeyEncoding( $key );
 117                 }
 118
 119                 return $this->client->get_multi( $keys );
 120         }
 121
 122         protected function serialize( $value ) {
 123                 return is_int( $value ) ? $value : $this->client->serialize( $value );
 124         }
 125
 126         protected function unserialize( $value ) {
 127                 return $this->isInteger( $value ) ? (int)$value : $this->client->unserialize( $value );
 128         }
 129 }