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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' );
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