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<?php |
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/** |
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* @author Robin Appelman <[email protected]> |
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* |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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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 Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OC\Cache; |
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use OCP\ICache; |
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/** |
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* In-memory cache with a capacity limit to keep memory usage in check |
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* |
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* Uses a simple FIFO expiry mechanism |
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*/ |
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class CappedMemoryCache implements ICache, \ArrayAccess { |
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private $capacity; |
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private $cache = []; |
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public function __construct($capacity = 512) { |
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$this->capacity = $capacity; |
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} |
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public function hasKey($key) { |
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return isset($this->cache[$key]); |
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} |
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public function get($key) { |
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return isset($this->cache[$key]) ? $this->cache[$key] : null; |
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} |
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public function set($key, $value, $ttl = 0) { |
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$this->cache[$key] = $value; |
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$this->garbageCollect(); |
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} |
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public function remove($key) { |
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unset($this->cache[$key]); |
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return true; |
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} |
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public function clear($prefix = '') { |
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$this->cache = []; |
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return true; |
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} |
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public function offsetExists($offset) { |
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return $this->hasKey($offset); |
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} |
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public function offsetGet($offset) { |
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return $this->get($offset); |
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} |
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public function offsetSet($offset, $value) { |
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$this->set($offset, $value); |
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} |
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public function offsetUnset($offset) { |
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$this->remove($offset); |
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} |
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private function garbageCollect() { |
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while (count($this->cache) > $this->capacity) { |
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reset($this->cache); |
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$key = key($this->cache); |
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$this->remove($key); |
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} |
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} |
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} |
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owncloud /
core
