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<?php
/**
* Per-process memory cache for storing items.
*
* 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
*/
use Wikimedia\Assert\Assert;
/**
* Simple store for keeping values in an associative array for the current process.
*
* Data will not persist and is not shared with other processes.
*
* @ingroup Cache
*/
class HashBagOStuff extends BagOStuff {
/** @var mixed[] */
protected $bag = [];
/** @var integer Max entries allowed */
protected $maxCacheKeys;
const KEY_VAL = 0;
const KEY_EXP = 1;
/**
* @param array $params Additional parameters include:
* - maxKeys : only allow this many keys (using oldest-first eviction)
*/
function __construct( $params = [] ) {
parent::__construct( $params );
$this->maxCacheKeys = isset( $params['maxKeys'] ) ? $params['maxKeys'] : INF;
Assert::parameter( $this->maxCacheKeys > 0, 'maxKeys', 'must be above zero' );
}
protected function expire( $key ) {
$et = $this->bag[$key][self::KEY_EXP];
if ( $et == self::TTL_INDEFINITE || $et > time() ) {
return false;
}
$this->delete( $key );
return true;
}
/**
* Does this bag have a non-null value for the given key?
*
* @param string $key
* @return bool
* @since 1.27
*/
protected function hasKey( $key ) {
return isset( $this->bag[$key] );
}
protected function doGet( $key, $flags = 0 ) {
if ( !$this->hasKey( $key ) ) {
return false;
}
if ( $this->expire( $key ) ) {
return false;
}
// Refresh key position for maxCacheKeys eviction
$temp = $this->bag[$key];
unset( $this->bag[$key] );
$this->bag[$key] = $temp;
return $this->bag[$key][self::KEY_VAL];
}
public function set( $key, $value, $exptime = 0, $flags = 0 ) {
// Refresh key position for maxCacheKeys eviction
unset( $this->bag[$key] );
$this->bag[$key] = [
self::KEY_VAL => $value,
self::KEY_EXP => $this->convertExpiry( $exptime )
];
if ( count( $this->bag ) > $this->maxCacheKeys ) {
reset( $this->bag );
$evictKey = key( $this->bag );
unset( $this->bag[$evictKey] );
}
return true;
}
public function delete( $key ) {
unset( $this->bag[$key] );
return true;
}
public function clear() {
$this->bag = [];
}
}
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