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<?php |
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/* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* The software is based on the Axon Framework project which is |
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* licensed under the Apache 2.0 license. For more information on the Axon Framework |
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* see <http://www.axonframework.org/>. |
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* |
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* This software consists of voluntary contributions made by many individuals |
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* and is licensed under the MIT license. For more information, see |
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* <http://www.governor-framework.org/>. |
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*/ |
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namespace Governor\Framework\Repository; |
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use Governor\Framework\Domain\AggregateRootInterface; |
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/** |
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* Description of OptimitsticLockManager |
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* |
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* @author "David Kalosi" <[email protected]> |
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* @license <a href="http://www.opensource.org/licenses/mit-license.php">MIT License</a> |
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*/ |
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// TODO this should be moved to the redis extension since this cannot occur without workers |
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class OptimisticLockManager implements LockManagerInterface |
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{ |
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private $locks = array(); |
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2 |
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public function obtainLock($aggregateIdentifier) |
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{ |
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2 |
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if (!array_key_exists($aggregateIdentifier, $this->locks)) { |
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2 |
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$this->locks[$aggregateIdentifier] = new OptimisticLock(); |
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} |
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2 |
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$lock = $this->locks[$aggregateIdentifier]; |
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if (!$lock->lock()) { |
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unset($this->locks[$aggregateIdentifier]); |
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} |
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} |
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public function releaseLock($aggregateIdentifier) |
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{ |
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if (array_key_exists($aggregateIdentifier, $this->locks)) { |
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$lock = $this->locks[$aggregateIdentifier]; |
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1 |
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$lock->unlock($aggregateIdentifier, $this->locks); |
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} |
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1 |
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} |
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1 |
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public function validateLock(AggregateRootInterface $aggregate) |
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{ |
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1 |
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if (array_key_exists($aggregate->getIdentifier(), $this->locks)) { |
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1 |
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$lock = $this->locks[$aggregate->getIdentifier()]; |
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return $lock->validate($aggregate); |
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} |
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return true; |
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} |
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} |
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class OptimisticLock |
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{ |
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private $versionNumber; |
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private $lockCount = 0; |
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private $closed = false; |
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public function validate(AggregateRootInterface $aggregate) |
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{ |
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1 |
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$lastCommitedScn = $aggregate->getVersion(); |
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1 |
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if (null === $this->versionNumber || $this->versionNumber === $lastCommitedScn) { |
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$last = (null === $lastCommitedScn) ? 0 : $lastCommitedScn; |
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$this->versionNumber = $last; |
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return true; |
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} |
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return false; |
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} |
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2 |
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public function lock() |
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{ |
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if ($this->closed) { |
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return false; |
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} |
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$this->lockCount++; |
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return true; |
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} |
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public function unlock($aggregateIdentifier, &$locks) |
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{ |
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1 |
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if ($this->lockCount !== 0) { |
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$this->lockCount--; |
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1 |
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} |
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1 |
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if ($this->lockCount === 0) { |
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1 |
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$this->closed = true; |
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unset($locks[$aggregateIdentifier]); |
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1 |
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} |
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1 |
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} |
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} |
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SmartGecko /
GovernorFramework
Having each class in a dedicated file usually plays nice with PSR autoloaders and is therefore a well established practice. If you use other autoloaders, you might not want to follow this rule.