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<?php
/**
* 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
*/
namespace Wikimedia\ObjectCache;
use InvalidArgumentException;
/**
* Store data in a memory for the current request/process only.
*
* This keeps values in a simple associative array.
* Data will not persist and is not shared with other requests
* on the same server.
*
* @newable
* @ingroup Cache
*/
class HashBagOStuff extends MediumSpecificBagOStuff {
/** @var mixed[] */
protected $bag = [];
/** @var int|double Max entries allowed, INF for unlimited */
protected $maxCacheKeys;
/** @var string CAS token prefix for this instance */
private $token;
/** @var int CAS token counter */
private static $casCounter = 0;
public const KEY_VAL = 0;
public const KEY_EXP = 1;
public const KEY_CAS = 2;
/**
* @stable to call
*
* @param array $params Additional parameters include:
* - maxKeys : only allow this many keys (using oldest-first eviction)
*
* @phpcs:ignore Generic.Files.LineLength
* @phan-param array{logger?:\Psr\Log\LoggerInterface,asyncHandler?:callable,keyspace?:string,reportDupes?:bool,segmentationSize?:int,segmentedValueMaxSize?:int,maxKeys?:int} $params
*/
public function __construct( $params = [] ) {
$params['segmentationSize'] ??= INF;
parent::__construct( $params );
$this->token = microtime( true ) . ':' . mt_rand();
$maxKeys = $params['maxKeys'] ?? INF;
if ( $maxKeys !== INF && ( !is_int( $maxKeys ) || $maxKeys <= 0 ) ) {
throw new InvalidArgumentException( '$maxKeys parameter must be above zero' );
}
$this->maxCacheKeys = $maxKeys;
$this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_SCRIPT;
}
protected function doGet( $key, $flags = 0, &$casToken = null ) {
$getToken = ( $casToken === self::PASS_BY_REF );
$casToken = null;
if ( !$this->hasKey( $key ) || $this->expire( $key ) ) {
return false;
}
// Refresh key position for maxCacheKeys eviction
$temp = $this->bag[$key];
unset( $this->bag[$key] );
$this->bag[$key] = $temp;
$value = $this->bag[$key][self::KEY_VAL];
if ( $getToken && $value !== false ) {
$casToken = $this->bag[$key][self::KEY_CAS];
}
return $value;
}
protected function doSet( $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->getExpirationAsTimestamp( $exptime ),
self::KEY_CAS => $this->token . ':' . ++self::$casCounter
];
if ( count( $this->bag ) > $this->maxCacheKeys ) {
$evictKey = array_key_first( $this->bag );
unset( $this->bag[$evictKey] );
}
return true;
}
protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) {
if ( $this->hasKey( $key ) && !$this->expire( $key ) ) {
// key already set
return false;
}
return $this->doSet( $key, $value, $exptime, $flags );
}
protected function doDelete( $key, $flags = 0 ) {
unset( $this->bag[$key] );
return true;
}
protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) {
$curValue = $this->doGet( $key );
if ( $curValue === false ) {
$newValue = $this->doSet( $key, $init, $exptime ) ? $init : false;
} elseif ( $this->isInteger( $curValue ) ) {
$newValue = max( $curValue + $step, 0 );
$this->bag[$key][self::KEY_VAL] = $newValue;
} else {
$newValue = false;
}
return $newValue;
}
/**
* Clear all values in cache
*/
public function clear() {
$this->bag = [];
}
/**
* @param string $key
*
* @return bool
*/
protected function expire( $key ) {
$et = $this->bag[$key][self::KEY_EXP];
if ( $et == self::TTL_INDEFINITE || $et > $this->getCurrentTime() ) {
return false;
}
$this->doDelete( $key );
return true;
}
/**
* Does this bag have a non-null value for the given key?
*
* @param string $key
*
* @return bool
* @since 1.27
*/
public function hasKey( $key ) {
return isset( $this->bag[$key] );
}
}
/** @deprecated class alias since 1.43 */
class_alias( HashBagOStuff::class, 'HashBagOStuff' );