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57 lines
1.4 KiB
57 lines
1.4 KiB
<?php |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Robin Appelman <robin@icewind.nl> |
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* |
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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\Memcache; |
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trait CASTrait { |
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abstract public function get($key); |
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abstract public function set($key, $value, $ttl = 0); |
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abstract public function remove($key); |
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abstract public function add($key, $value, $ttl = 0); |
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/** |
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* Compare and set |
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* |
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* @param string $key |
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* @param mixed $old |
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* @param mixed $new |
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* @return bool |
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*/ |
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public function cas($key, $old, $new) { |
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//no native cas, emulate with locking |
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if ($this->add($key . '_lock', true)) { |
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if ($this->get($key) === $old) { |
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$this->set($key, $new); |
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$this->remove($key . '_lock'); |
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return true; |
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} else { |
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$this->remove($key . '_lock'); |
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return false; |
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} |
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} else { |
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return false; |
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} |
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} |
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}
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