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<?php
/**
* Object caching using PHP's APC accelerator.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
*/
/**
* This is a wrapper for APC's shared memory functions
*
* @ingroup Cache
*/
class APCBagOStuff extends BagOStuff {
/**
* @var bool If true, trust the APC implementation to serialize and
* deserialize objects correctly. If false, (de-)serialize in PHP.
*/
protected $nativeSerialize;
/**
* @var string String to append to each APC key. This may be changed
* whenever the handling of values is changed, to prevent existing code
* from encountering older values which it cannot handle.
*/
const KEY_SUFFIX = ':2';
/**
* Constructor
*
* Available parameters are:
* - nativeSerialize: If true, pass objects to apc_store(), and trust it
* to serialize them correctly. If false, serialize
* all values in PHP.
*
* @param array $params
*/
public function __construct( array $params = array() ) {
parent::__construct( $params );
if ( isset( $params['nativeSerialize'] ) ) {
$this->nativeSerialize = $params['nativeSerialize'];
} elseif ( extension_loaded( 'apcu' ) && ini_get( 'apc.serializer' ) === 'default' ) {
// APCu has a memory corruption bug when the serializer is set to 'default'.
// See T120267, and upstream bug reports:
// - https://github.com/krakjoe/apcu/issues/38
// - https://github.com/krakjoe/apcu/issues/35
// - https://github.com/krakjoe/apcu/issues/111
$this->logger->warning(
'The APCu extension is loaded and the apc.serializer INI setting ' .
'is set to "default". This can cause memory corruption! ' .
'You should change apc.serializer to "php" instead. ' .
'See <https://github.com/krakjoe/apcu/issues/38>.'
);
$this->nativeSerialize = false;
} else {
$this->nativeSerialize = true;
}
}
public function get( $key, &$casToken = null, $flags = 0 ) {
$val = apc_fetch( $key . self::KEY_SUFFIX );
$casToken = $val;
if ( is_string( $val ) && !$this->nativeSerialize ) {
$val = $this->isInteger( $val )
? intval( $val )
: unserialize( $val );
}
return $val;
}
public function set( $key, $value, $exptime = 0 ) {
if ( !$this->nativeSerialize && !$this->isInteger( $value ) ) {
$value = serialize( $value );
}
apc_store( $key . self::KEY_SUFFIX, $value, $exptime );
return true;
}
public function delete( $key ) {
apc_delete( $key . self::KEY_SUFFIX );
return true;
}
public function incr( $key, $value = 1 ) {
return apc_inc( $key . self::KEY_SUFFIX, $value );
}
public function decr( $key, $value = 1 ) {
return apc_dec( $key . self::KEY_SUFFIX, $value );
}
}
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