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<?php |
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declare(strict_types=1); |
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/* |
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Copyright (C) 2006-2014 David Négrier - THE CODING MACHINE |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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namespace TheCodingMachine\TDBM; |
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use WeakReference; |
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/** |
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* The NativeWeakrefObjectStorage class is used to reference all beans that have been fetched from the database. |
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* If a bean is requested twice from TDBM, the NativeWeakrefObjectStorage is used to "cache" the bean. |
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* WeakReference have been added in PHP 7.4. |
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* |
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* @author David Negrier |
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*/ |
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class NativeWeakrefObjectStorage implements ObjectStorageInterface |
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{ |
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/** |
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* An array of fetched object, accessible via table name and primary key. |
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* If the primary key is split on several columns, access is done by an array of columns, serialized. |
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* |
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* @var WeakReference[][] |
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*/ |
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private $objects = array(); |
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/** |
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* Every 10000 set in the dataset, we perform a cleanup to ensure the WeakRef instances |
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* are removed if they are no more valid. |
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* This is to avoid having memory used by dangling WeakRef instances. |
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* |
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* @var int |
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*/ |
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private $garbageCollectorCount = 0; |
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/** |
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* Sets an object in the storage. |
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* |
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* @param string $tableName |
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* @param string|int $id |
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* @param DbRow $dbRow |
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*/ |
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public function set(string $tableName, $id, DbRow $dbRow): void |
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{ |
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$this->objects[$tableName][$id] = WeakReference::create($dbRow); |
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++$this->garbageCollectorCount; |
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if ($this->garbageCollectorCount === 10000) { |
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$this->garbageCollectorCount = 0; |
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$this->cleanupDanglingWeakRefs(); |
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} |
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} |
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/** |
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* Returns an object from the storage (or null if no object is set). |
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* |
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* @param string $tableName |
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* @param string|int $id |
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* |
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* @return DbRow|null |
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*/ |
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public function get(string $tableName, $id): ?DbRow |
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{ |
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if (isset($this->objects[$tableName][$id])) { |
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return $this->objects[$tableName][$id]->get(); |
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} |
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return null; |
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} |
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/** |
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* Removes an object from the storage. |
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* |
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* @param string $tableName |
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* @param string|int $id |
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*/ |
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public function remove(string $tableName, $id): void |
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{ |
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unset($this->objects[$tableName][$id]); |
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} |
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/** |
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* Removes all objects from the storage. |
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*/ |
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public function clear(): void |
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{ |
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$this->objects = array(); |
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} |
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private function cleanupDanglingWeakRefs(): void |
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{ |
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foreach ($this->objects as $tableName => $table) { |
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foreach ($table as $id => $obj) { |
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if ($obj->get() === null) { |
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unset($this->objects[$tableName][$id]); |
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} |
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} |
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} |
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} |
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} |
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thecodingmachine /
tdbm
