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<?php |
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/* |
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* This file is part of the TYPO3 CMS project. |
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* |
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* It is free software; you can redistribute it and/or modify it under |
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* the terms of the GNU General Public License, either version 2 |
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* of the License, or any later version. |
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* |
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* For the full copyright and license information, please read the |
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* LICENSE.txt file that was distributed with this source code. |
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* |
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* The TYPO3 project - inspiring people to share! |
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*/ |
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namespace TYPO3\CMS\Core\Locking; |
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use TYPO3\CMS\Core\Locking\Exception\LockAcquireException; |
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use TYPO3\CMS\Core\Locking\Exception\LockAcquireWouldBlockException; |
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use TYPO3\CMS\Core\Locking\Exception\LockCreateException; |
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/** |
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* Wrapper for locking API that uses two locks |
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* to not exhaust locking resources and still block properly |
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*/ |
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class ResourceMutex |
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{ |
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/** |
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* @var LockFactory |
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*/ |
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private $lockFactory; |
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/** |
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* Access lock |
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* |
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* @var LockingStrategyInterface[] |
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*/ |
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private $accessLocks = []; |
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/** |
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* Image processing lock |
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* |
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* @var LockingStrategyInterface[] |
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*/ |
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private $workerLocks = []; |
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public function __construct(LockFactory $lockFactory) |
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{ |
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$this->lockFactory = $lockFactory; |
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} |
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/** |
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* Acquire a specific lock for the given scope |
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* @see \TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController::acquireLock |
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* |
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* @param string $scope |
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* @param string $key |
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* @throws LockAcquireException |
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* @throws LockCreateException |
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*/ |
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public function acquireLock(string $scope, string $key): void |
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{ |
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$this->accessLocks[$scope] = $this->lockFactory->createLocker($scope); |
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$this->workerLocks[$scope] = $this->lockFactory->createLocker( |
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$key, |
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LockingStrategyInterface::LOCK_CAPABILITY_EXCLUSIVE | LockingStrategyInterface::LOCK_CAPABILITY_NOBLOCK |
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); |
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do { |
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if (!$this->accessLocks[$scope]->acquire()) { |
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throw new \RuntimeException('Could not acquire access lock for "' . $scope . '"".', 1601923209); |
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} |
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try { |
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$locked = $this->workerLocks[$scope]->acquire( |
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LockingStrategyInterface::LOCK_CAPABILITY_EXCLUSIVE | LockingStrategyInterface::LOCK_CAPABILITY_NOBLOCK |
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); |
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} catch (LockAcquireWouldBlockException $e) { |
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// somebody else has the lock, we keep waiting |
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// first release the access lock |
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$this->accessLocks[$scope]->release(); |
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// now lets make a short break (100ms) until we try again, since |
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// the page generation by the lock owner will take a while anyways |
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usleep(100000); |
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continue; |
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} |
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$this->accessLocks[$scope]->release(); |
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if ($locked) { |
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break; |
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} |
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throw new \RuntimeException('Could not acquire image process lock for ' . $key . '.', 1601923215); |
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} while (true); |
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} |
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/** |
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* Release a worker specific lock |
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* |
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* @param string $scope |
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* @throws LockAcquireException |
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* @throws LockAcquireWouldBlockException |
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*/ |
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public function releaseLock(string $scope): void |
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{ |
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if ($this->accessLocks[$scope] ?? null) { |
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if (!$this->accessLocks[$scope]->acquire()) { |
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throw new \RuntimeException('Could not acquire access lock for "' . $scope . '"".', 1601923319); |
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} |
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$this->workerLocks[$scope]->release(); |
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$this->workerLocks[$scope]->destroy(); |
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$this->workerLocks[$scope] = null; |
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$this->accessLocks[$scope]->release(); |
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$this->accessLocks[$scope] = null; |
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} |
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} |
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} |
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TYPO3 /
TYPO3.CMS
