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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) 2015, 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\Lock; |
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use OCP\IMemcacheTTL; |
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use OCP\Lock\LockedException; |
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use OCP\IMemcache; |
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class MemcacheLockingProvider extends AbstractLockingProvider { |
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/** |
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* @var \OCP\IMemcache |
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*/ |
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private $memcache; |
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/** |
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* @param \OCP\IMemcache $memcache |
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*/ |
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public function __construct(IMemcache $memcache) { |
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$this->memcache = $memcache; |
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} |
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894 |
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private function setTTL($path) { |
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894 |
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if ($this->memcache instanceof IMemcacheTTL) { |
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$this->memcache->setTTL($path, self::TTL); |
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} |
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} |
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/** |
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* @param string $path |
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* @param int $type self::LOCK_SHARED or self::LOCK_EXCLUSIVE |
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* @return bool |
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*/ |
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public function isLocked($path, $type) { |
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$lockValue = $this->memcache->get($path); |
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if ($type === self::LOCK_SHARED) { |
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return $lockValue > 0; |
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} else if ($type === self::LOCK_EXCLUSIVE) { |
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return $lockValue === 'exclusive'; |
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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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* @param string $path |
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* @param int $type self::LOCK_SHARED or self::LOCK_EXCLUSIVE |
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* @throws \OCP\Lock\LockedException |
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*/ |
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public function acquireLock($path, $type) { |
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894 |
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if (strlen($path) > 64) { // max length in file_locks |
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throw new \InvalidArgumentException("Lock key length too long"); |
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} |
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if ($type === self::LOCK_SHARED) { |
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if (!$this->memcache->inc($path)) { |
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throw new LockedException($path); |
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} |
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} else { |
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$this->memcache->add($path, 0); |
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if (!$this->memcache->cas($path, 0, 'exclusive')) { |
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throw new LockedException($path); |
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} |
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} |
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$this->setTTL($path); |
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$this->markAcquire($path, $type); |
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} |
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/** |
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* @param string $path |
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* @param int $type self::LOCK_SHARED or self::LOCK_EXCLUSIVE |
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*/ |
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public function releaseLock($path, $type) { |
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if ($type === self::LOCK_SHARED) { |
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if (isset($this->acquiredLocks['shared'][$path]) and $this->acquiredLocks['shared'][$path] > 0) { |
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$this->memcache->dec($path); |
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$this->memcache->cad($path, 0); |
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} |
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} else if ($type === self::LOCK_EXCLUSIVE) { |
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$this->memcache->cad($path, 'exclusive'); |
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} |
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$this->markRelease($path, $type); |
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} |
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/** |
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* Change the type of an existing lock |
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* |
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* @param string $path |
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* @param int $targetType self::LOCK_SHARED or self::LOCK_EXCLUSIVE |
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* @throws \OCP\Lock\LockedException |
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*/ |
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public function changeLock($path, $targetType) { |
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if ($targetType === self::LOCK_SHARED) { |
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if (!$this->memcache->cas($path, 'exclusive', 1)) { |
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throw new LockedException($path); |
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} |
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} else if ($targetType === self::LOCK_EXCLUSIVE) { |
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// we can only change a shared lock to an exclusive if there's only a single owner of the shared lock |
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if (!$this->memcache->cas($path, 1, 'exclusive')) { |
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throw new LockedException($path); |
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} |
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} |
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$this->setTTL($path); |
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$this->markChange($path, $targetType); |
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} |
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} |
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owncloud /
core
