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<?php |
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/** |
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* This file is part of the daikon-cqrs/cqrs project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Daikon\EventSourcing\EventStore; |
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use Daikon\EventSourcing\Aggregate\AggregateIdInterface; |
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use Daikon\EventSourcing\Aggregate\AggregateRevision; |
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use Daikon\EventSourcing\Aggregate\AggregateRootInterface; |
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use Daikon\EventSourcing\Aggregate\DomainEventSequence; |
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use Daikon\MessageBus\Metadata\Metadata; |
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final class UnitOfWork implements UnitOfWorkInterface |
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{ |
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private const MAX_RESOLUTION_ATTEMPTS = 5; |
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/** @var string */ |
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private $aggregateRootType; |
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/** @var StreamStoreInterface */ |
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private $streamStore; |
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/** @var StreamProcessorInterface */ |
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private $streamProcessor; |
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/** @var string */ |
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private $streamImplementor; |
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/** @var StreamMap */ |
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private $trackedCommitStreams; |
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public function __construct( |
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string $aggregateRootType, |
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StreamStoreInterface $streamStore, |
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StreamProcessorInterface $streamProcessor = null, |
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string $streamImplementor = Stream::class |
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) { |
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$this->aggregateRootType = $aggregateRootType; |
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$this->streamStore = $streamStore; |
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$this->streamProcessor = $streamProcessor; |
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$this->streamImplementor = $streamImplementor; |
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$this->trackedCommitStreams = StreamMap::makeEmpty(); |
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} |
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public function commit(AggregateRootInterface $aggregateRoot, Metadata $metadata): CommitSequence |
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{ |
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$prevStream = $this->getTrackedStream($aggregateRoot); |
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$updatedStream = $prevStream->appendEvents($aggregateRoot->getTrackedEvents(), $metadata); |
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$result = $this->streamStore->commit($updatedStream, $prevStream->getStreamRevision()); |
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$resolutionAttempts = 0; |
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while ($result instanceof PossibleConflict) { |
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$conflictingStream = $this->streamStore->checkout($updatedStream->getStreamId()); |
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$conflictingEvents = $this->detectConflictingEvents($aggregateRoot, $conflictingStream); |
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if (!$conflictingEvents->isEmpty()) { |
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throw new UnresolvableConflict($conflictingStream->getStreamId(), $conflictingEvents); |
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} |
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$resolvedStream = $conflictingStream->appendEvents($aggregateRoot->getTrackedEvents()); |
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$result = $this->streamStore->commit($resolvedStream, $conflictingStream->getStreamRevision()); |
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if (++$resolutionAttempts >= self::MAX_RESOLUTION_ATTEMPTS) { |
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throw new ConcurrencyRaceLost($conflictingStream->getStreamId(), $aggregateRoot->getTrackedEvents()); |
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} |
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} |
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$this->trackedCommitStreams = $this->trackedCommitStreams->unregister($prevStream); |
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return $updatedStream->getCommitRange($prevStream->getStreamRevision(), $updatedStream->getStreamRevision()); |
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} |
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public function checkout(AggregateIdInterface $aggregateId, AggregateRevision $revision): AggregateRootInterface |
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{ |
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$streamId = StreamId::fromNative($aggregateId->toNative()); |
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$stream = $this->streamStore->checkout($streamId, $revision); |
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$aggregateRoot = call_user_func( |
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[ $this->aggregateRootType, 'reconstituteFromHistory' ], |
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$aggregateId, |
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$this->buildEventHistory($stream) |
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); |
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$this->trackedCommitStreams = $this->trackedCommitStreams->register($stream); |
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return $aggregateRoot; |
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} |
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private function getTrackedStream(AggregateRootInterface $aggregateRoot): StreamInterface |
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{ |
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$streamId = StreamId::fromNative((string)$aggregateRoot->getIdentifier()); |
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$tailRevision = $aggregateRoot->getTrackedEvents()->getTailRevision(); |
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if ($this->trackedCommitStreams->has((string)$streamId)) { |
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$stream = $this->trackedCommitStreams->get((string)$streamId); |
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} elseif ($tailRevision->isInitial()) { |
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$stream = call_user_func([ $this->streamImplementor, 'fromStreamId' ], $streamId); |
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$this->trackedCommitStreams = $this->trackedCommitStreams->register($stream); |
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} else { |
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throw new \Exception("Existing aggregate-roots must be checked out before they may be comitted."); |
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} |
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return $stream; |
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} |
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private function buildEventHistory(StreamInterface $stream, AggregateRevision $to): DomainEventSequence |
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{ |
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$history = DomainEventSequence::makeEmpty(); |
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if ($this->streamProcessor) { |
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$stream = $this->streamProcessor->process($stream); |
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} |
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foreach ($stream as $commit) { |
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if (!$to->isEmpty() && $commit->getAggregateRevision()->isGreaterThan($to)) { |
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break; |
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} |
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foreach ($commit->getEventLog() as $event) { |
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$history = $history->push($event); |
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} |
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} |
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return $history; |
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} |
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private function detectConflictingEvents(AggregateRootInterface $aggregateRoot, StreamInterface $stream): array |
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{ |
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$conflictingEvents = []; |
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foreach ($newEvents as $newEvent) { |
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foreach ($stream->findCommitsSince($aggregateRoot->getRevision()) as $previousCommit) { |
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foreach ($previousCommit->getEventLog() as $previousEvent) { |
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if ($newEvent->conflictsWith($previousEvent)) { |
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$conflictingEvents[] = [ $previousEvent, $newEvent ]; |
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} |
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} |
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} |
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} |
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return $conflictingEvents; |
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} |
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} |
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daikon-cqrs /
event-sourcing
Loading history...
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..