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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\Command\CommandDispatcher; |
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use Gica\Cqrs\Aggregate\AggregateRepository; |
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use Gica\Cqrs\Command; |
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use Gica\Cqrs\Command\CommandApplier; |
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use Gica\Cqrs\Command\CommandDispatcher; |
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use Gica\Cqrs\Command\CommandSubscriber; |
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use Gica\Cqrs\Command\CommandWithMetadata; |
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use Gica\Cqrs\Command\MetadataWrapper as CommandMetadataFactory; |
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use Gica\Cqrs\Command\ValueObject\CommandHandlerAndAggregate; |
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use Gica\Cqrs\Event\EventDispatcher; |
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use Gica\Cqrs\Event\EventsApplier\EventsApplierOnAggregate; |
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use Gica\Cqrs\Event\EventWithMetaData; |
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use Gica\Cqrs\Event\MetaData; |
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use Gica\Cqrs\Event\MetadataFactory as EventMetadataFactory; |
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use Gica\Cqrs\Event\ScheduledEvent; |
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use Gica\Cqrs\FutureEventsStore; |
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use Gica\Cqrs\Scheduling\CommandScheduler; |
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use Gica\Cqrs\Scheduling\ScheduledCommand; |
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use Gica\Types\Guid; |
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class DefaultCommandDispatcher implements CommandDispatcher |
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{ |
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const MAXIMUM_SAVE_RETRIES = 50; |
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/** |
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* @var CommandSubscriber |
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*/ |
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private $commandSubscriber; |
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/** |
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* @var EventDispatcher |
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*/ |
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private $eventDispatcher; |
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/** |
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* @var CommandApplier |
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*/ |
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private $commandApplier; |
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/** |
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* @var AggregateRepository |
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*/ |
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private $aggregateRepository; |
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/** |
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* @var ConcurrentProofFunctionCaller |
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*/ |
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private $concurrentProofFunctionCaller; |
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/** |
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* @var FutureEventsStore|null |
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*/ |
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private $futureEventsStore; |
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/** |
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* @var EventsApplierOnAggregate |
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*/ |
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private $eventsApplierOnAggregate; |
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/** |
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* @var CommandScheduler|null |
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*/ |
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private $commandScheduler; |
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/** |
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* @var EventMetadataFactory |
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*/ |
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private $eventMetadataFactory; |
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/** |
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* @var CommandMetadataFactory |
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*/ |
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private $commandMetadataFactory; |
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public function __construct( |
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CommandSubscriber $commandSubscriber, |
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EventDispatcher $eventDispatcher, |
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CommandApplier $commandApplier, |
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AggregateRepository $aggregateRepository, |
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ConcurrentProofFunctionCaller $functionCaller, |
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EventsApplierOnAggregate $eventsApplier, |
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EventMetadataFactory $eventMetadataFactory, |
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CommandMetadataFactory $commandMetadataFactory, |
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?FutureEventsStore $futureEventsStore = null, |
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?CommandScheduler $commandScheduler = null |
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) |
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{ |
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$this->commandSubscriber = $commandSubscriber; |
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$this->eventDispatcher = $eventDispatcher; |
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$this->commandApplier = $commandApplier; |
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$this->aggregateRepository = $aggregateRepository; |
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$this->concurrentProofFunctionCaller = $functionCaller; |
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$this->futureEventsStore = $futureEventsStore; |
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$this->eventsApplierOnAggregate = $eventsApplier; |
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$this->commandScheduler = $commandScheduler; |
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$this->eventMetadataFactory = $eventMetadataFactory; |
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$this->commandMetadataFactory = $commandMetadataFactory; |
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} |
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public function dispatchCommand(Command $command, $metadata = null) |
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{ |
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$command = $this->commandMetadataFactory->wrapCommandWithMetadata($command, $metadata); |
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/** @var EventWithMetaData[] $eventsWithMetaData */ |
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/** @var ScheduledCommand[] $scheduledCommands */ |
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list($eventsWithMetaData, $futureEventsWithMeta, $scheduledCommands, $aggregateClass) = $this->concurrentProofFunctionCaller->executeFunction(function () use ($command) { |
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return $this->tryDispatchCommandAndSaveAggregate($command); |
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}, $this->getMaximumCommandRetryCount()); |
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foreach ($eventsWithMetaData as $eventWithMetaData) { |
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$this->eventDispatcher->dispatchEvent($eventWithMetaData); |
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} |
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if ($this->futureEventsStore && !empty($futureEventsWithMeta)) { |
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$this->futureEventsStore->scheduleEvents($futureEventsWithMeta); |
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} |
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if ($this->commandScheduler && !empty($scheduledCommands)) { |
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foreach ($scheduledCommands as $scheduledCommand) { |
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$this->commandScheduler->scheduleCommand($scheduledCommand, $aggregateClass, $command->getAggregateId(), $metadata); |
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} |
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} |
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} |
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private function tryDispatchCommandAndSaveAggregate(CommandWithMetadata $command) |
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{ |
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$handlerAndAggregate = $this->loadCommandHandlerAndAggregate($command); |
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list($eventsForNow, $eventsForTheFuture, $scheduledCommands) = $this->applyCommandAndReturnMessages($command, $handlerAndAggregate); |
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$eventsForNow = $this->aggregateRepository->saveAggregate($command->getAggregateId(), $handlerAndAggregate->getAggregate(), $eventsForNow); |
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return [$eventsForNow, $eventsForTheFuture, $scheduledCommands, $handlerAndAggregate->getCommandHandler()->getHandlerClass()]; |
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} |
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private function loadCommandHandlerAndAggregate(CommandWithMetadata $command): CommandHandlerAndAggregate |
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{ |
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$handler = $this->commandSubscriber->getHandlerForCommand($command->getCommand()); |
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$aggregate = $this->aggregateRepository->loadAggregate($handler->getHandlerClass(), $command->getAggregateId()); |
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return new CommandHandlerAndAggregate($handler, $aggregate); |
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} |
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private function decorateEventWithMetaData($event, MetaData $metaData): EventWithMetaData |
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{ |
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return new EventWithMetaData($event, $metaData->withEventId(Guid::generate())); |
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} |
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/** |
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* @param CommandWithMetadata $command |
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* @param CommandHandlerAndAggregate $handlerAndAggregate |
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* @return array |
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*/ |
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private function applyCommandAndReturnMessages(CommandWithMetadata $command, CommandHandlerAndAggregate $handlerAndAggregate) |
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{ |
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$aggregate = $handlerAndAggregate->getAggregate(); |
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$handler = $handlerAndAggregate->getCommandHandler(); |
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$metaData = $this->eventMetadataFactory->factoryEventMetadata($command, $aggregate); |
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$newMessageGenerator = $this->commandApplier->applyCommand($aggregate, $command->getCommand(), $handler->getMethodName()); |
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/** @var EventWithMetaData[] $eventsWithMetaData */ |
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$eventsWithMetaData = []; |
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/** @var EventWithMetaData[] $scheduledEvents */ |
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$scheduledEvents = []; |
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/** @var ScheduledCommand[] $scheduledCommands */ |
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$scheduledCommands = []; |
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foreach ($newMessageGenerator as $message) { |
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if ($this->isScheduledCommand($message)) { |
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$scheduledCommands[] = $message; |
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} else { |
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$eventWithMetaData = $this->decorateEventWithMetaData($message, $metaData); |
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if (!$this->isScheduledEvent($message)) { |
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$this->eventsApplierOnAggregate->applyEventsOnAggregate($aggregate, [$eventWithMetaData]); |
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$eventsWithMetaData[] = $eventWithMetaData; |
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} else { |
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$scheduledEvents[] = $eventWithMetaData; |
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} |
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} |
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} |
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return [$eventsWithMetaData, $scheduledEvents, $scheduledCommands]; |
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} |
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private function isScheduledEvent($event): bool |
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{ |
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return $event instanceof ScheduledEvent; |
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} |
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private function isScheduledCommand($message): bool |
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{ |
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return $message instanceof ScheduledCommand; |
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} |
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protected function getMaximumCommandRetryCount(): int |
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{ |
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return self::MAXIMUM_SAVE_RETRIES; |
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} |
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} |
xprt64 /
cqrs-es
