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<?php |
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/** |
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* Copyright (c) 2017 Constantin Galbenu <[email protected]> |
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*/ |
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namespace Gica\Cqrs\Saga; |
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use Gica\CodeAnalysis\MethodListenerDiscovery; |
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use Gica\CodeAnalysis\MethodListenerDiscovery\ListenerClassValidator\AnyPhpClassIsAccepted; |
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use Gica\CodeAnalysis\MethodListenerDiscovery\ListenerMethod; |
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use Gica\CodeAnalysis\Shared\ClassSorter\ByConstructorDependencySorter; |
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use Gica\Cqrs\Command\CodeAnalysis\WriteSideEventHandlerDetector; |
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use Gica\Cqrs\Event\EventWithMetaData; |
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use Gica\Cqrs\EventProcessing\ConcurentEventProcessingException; |
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use Gica\Cqrs\EventStore; |
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use Gica\Cqrs\ProgressReporting\TaskProgressCalculator; |
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use Gica\Cqrs\ProgressReporting\TaskProgressReporter; |
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use Gica\Cqrs\Saga\SagaRunner\EventProcessingHasStalled; |
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use Psr\Log\LoggerInterface; |
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/** |
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* This class can be run in background to feed a saga with events |
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*/ |
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class SagaRunner |
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{ |
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/** |
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* @var EventStore |
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*/ |
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private $eventStore; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @var SagaEventTrackerRepository |
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*/ |
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private $sagaRepository; |
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/** |
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* @var TaskProgressReporter|null |
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*/ |
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private $taskProgressReporter; |
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public function __construct( |
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EventStore $eventStore, |
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LoggerInterface $logger, |
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SagaEventTrackerRepository $sagaRepository |
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) |
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{ |
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$this->eventStore = $eventStore; |
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$this->logger = $logger; |
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$this->sagaRepository = $sagaRepository; |
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} |
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public function setTaskProgressReporter(?TaskProgressReporter $taskProgressReporter) |
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{ |
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$this->taskProgressReporter = $taskProgressReporter; |
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} |
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public function feedSagaWithEvents($saga, ?int $afterSequence = null) |
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{ |
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$discoverer = new MethodListenerDiscovery( |
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new WriteSideEventHandlerDetector(), |
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new AnyPhpClassIsAccepted(), |
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new ByConstructorDependencySorter() |
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); |
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$allMethods = $discoverer->findListenerMethodsInClass(get_class($saga)); |
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$eventClasses = $this->getEventClassesFromMethods($allMethods); |
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$this->logger->info(print_r($eventClasses, true)); |
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$this->logger->info("loading events..."); |
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$allEvents = $this->eventStore->loadEventsByClassNames($eventClasses); |
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if (null !== $afterSequence) { |
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$allEvents->afterSequence($afterSequence); |
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} |
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$this->logger->info("processing events..."); |
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$taskProgress = null; |
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if ($this->taskProgressReporter) { |
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$taskProgress = new TaskProgressCalculator($allEvents->countCommits()); |
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} |
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foreach ($allEvents->fetchCommits() as $eventsCommit) { |
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$eventsCommit = $eventsCommit->filterEventsByClass($eventClasses); |
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foreach ($eventsCommit->getEventsWithMetadata() as $eventWithMetadata) { |
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$this->processEvent($saga, $eventWithMetadata, $allMethods); |
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} |
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if ($this->taskProgressReporter) { |
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$taskProgress->increment(); |
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$this->taskProgressReporter->reportProgressUpdate($taskProgress->getStep(), $taskProgress->getTotalSteps(), $taskProgress->calculateSpeed(), $taskProgress->calculateEta()); |
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} |
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} |
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} |
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/** |
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* @param ListenerMethod[] $methods |
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* @return array |
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*/ |
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private function getEventClassesFromMethods($methods) |
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{ |
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$eventClasses = []; |
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foreach ($methods as $listenerMethod) { |
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$eventClasses[] = $listenerMethod->getEventClassName(); |
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} |
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return $eventClasses; |
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} |
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/** |
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* @param string $eventClass |
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* @param ListenerMethod[] $allMethods |
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* @return ListenerMethod[] |
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*/ |
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private function findMethodsByEventClass(string $eventClass, $allMethods) |
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{ |
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$result = []; |
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foreach ($allMethods as $listenerMethod) { |
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if ($listenerMethod->getEventClassName() == $eventClass) { |
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$result[] = $listenerMethod; |
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} |
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} |
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return $result; |
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} |
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private function processEvent($saga, EventWithMetaData $eventWithMetadata, $allMethods): void |
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{ |
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/** @var EventWithMetaData $eventWithMetadata */ |
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$methods = $this->findMethodsByEventClass(get_class($eventWithMetadata->getEvent()), $allMethods); |
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$metaData = $eventWithMetadata->getMetaData(); |
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$sagaId = get_class($saga); |
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foreach ($methods as $method) { |
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try { |
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if ($this->sagaRepository->isEventProcessingAlreadyStarted($sagaId, $metaData->getEventId())) { |
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if (!$this->sagaRepository->isEventProcessingAlreadyEnded($sagaId, $metaData->getEventId())) { |
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throw new EventProcessingHasStalled($eventWithMetadata); |
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} |
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} else { |
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$this->sagaRepository->startProcessingEvent($sagaId, $metaData->getEventId()); |
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call_user_func([$saga, $method->getMethodName()], $eventWithMetadata->getEvent(), $eventWithMetadata->getMetaData()); |
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$this->sagaRepository->endProcessingEvent($sagaId, $metaData->getEventId()); |
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} |
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} catch (ConcurentEventProcessingException $exception) { |
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$this->logger->info("concurent event processing exception, skipping..."); |
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continue; |
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} |
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} |
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} |
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} |
xprt64 /
cqrs-es
