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<?php |
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/* |
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* event-sourcing (https://github.com/phpgears/event-sourcing). |
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* Event Sourcing base. |
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* |
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* @license MIT |
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* @link https://github.com/phpgears/event-sourcing |
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* @author Julián Gutiérrez <[email protected]> |
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*/ |
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declare(strict_types=1); |
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namespace Gears\EventSourcing\Store\Event; |
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use Gears\EventSourcing\Aggregate\AggregateVersion; |
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use Gears\EventSourcing\Event\AggregateEventEmptyStream; |
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use Gears\EventSourcing\Event\AggregateEventStream; |
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use Gears\EventSourcing\Store\Event\Exception\ConcurrencyException; |
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use Gears\EventSourcing\Store\Event\Exception\EventStoreException; |
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use Gears\EventSourcing\Store\StoreStream; |
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/** |
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* In memory Event Store implementation. |
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*/ |
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abstract class AbstractEventStore implements EventStore |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function loadFrom( |
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StoreStream $stream, |
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AggregateVersion $fromVersion, |
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?int $count = null |
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): AggregateEventStream { |
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if ($fromVersion->getValue() < 1) { |
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throw new EventStoreException( |
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\sprintf('Event store load from version must be at least 1, "%s" given', $fromVersion->getValue()) |
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); |
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} |
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if ($count !== null && $count < 1) { |
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throw new EventStoreException(\sprintf('Event store load count must be at least 1, "%s" given', $count)); |
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} |
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if (!$this->streamExists($stream)) { |
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$this->createStream($stream); |
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return new AggregateEventEmptyStream(); |
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} |
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return $this->loadEventsFrom($stream, $fromVersion, $count); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function loadTo( |
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StoreStream $stream, |
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AggregateVersion $toVersion, |
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?AggregateVersion $fromVersion = null |
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): AggregateEventStream { |
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if ($toVersion->getValue() < 1) { |
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throw new EventStoreException( |
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\sprintf('Event store load to version must be at least 1, "%s" given', $toVersion->getValue()) |
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); |
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} |
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$fromVersion = $fromVersion ?? new AggregateVersion(1); |
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if ($fromVersion->getValue() < 1) { |
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throw new EventStoreException( |
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\sprintf('Event store load from version must be at least 1, "%s" given', $fromVersion->getValue()) |
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); |
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} |
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if ($fromVersion->getValue() > $toVersion->getValue()) { |
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throw new EventStoreException(\sprintf( |
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'Event store load to version "%s" must be greater than from version "%s"', |
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$toVersion->getValue(), |
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$fromVersion->getValue() |
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)); |
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} |
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if (!$this->streamExists($stream)) { |
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$this->createStream($stream); |
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return new AggregateEventEmptyStream(); |
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} |
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return $this->loadEventsTo($stream, $toVersion, $fromVersion); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function store( |
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StoreStream $stream, |
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AggregateEventStream $eventStream, |
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AggregateVersion $expectedVersion |
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): void { |
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if ($eventStream->count() === 0) { |
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return; |
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} |
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$eventStream->rewind(); |
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if (!$this->streamExists($stream)) { |
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$this->createStream($stream); |
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} |
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$startVersion = $this->getStreamVersion($stream); |
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if (!$startVersion->isEqualTo($expectedVersion)) { |
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throw new ConcurrencyException(\sprintf( |
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'Expected stream version "%s" does not match current version "%s"', |
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$expectedVersion->getValue(), |
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$startVersion->getValue() |
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)); |
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} |
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$this->storeEvents($stream, $eventStream, $expectedVersion); |
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$eventStream->rewind(); |
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$events = \iterator_to_array($eventStream); |
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/** @var AggregateVersion $finalVersion */ |
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$finalVersion = \end($events)->getAggregateVersion(); |
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$endVersion = $this->getStreamVersion($stream); |
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if (!$endVersion->isEqualTo($finalVersion)) { |
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throw new ConcurrencyException(\sprintf( |
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'Expected final stream version "%s" does not match current version "%s"', |
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$finalVersion->getValue(), |
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$endVersion->getValue() |
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)); |
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} |
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} |
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/** |
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* Check stream existence. |
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* |
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* @param StoreStream $stream |
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* |
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* @return bool |
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*/ |
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abstract protected function streamExists(StoreStream $stream): bool; |
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/** |
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* Create stream. |
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* |
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* @param StoreStream $stream |
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*/ |
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abstract protected function createStream(StoreStream $stream): void; |
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/** |
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* Load aggregate events from a version. |
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* |
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* @param StoreStream $stream |
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* @param AggregateVersion $fromVersion |
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* @param int|null $count |
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* |
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* @return AggregateEventStream |
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*/ |
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abstract protected function loadEventsFrom( |
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StoreStream $stream, |
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AggregateVersion $fromVersion, |
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?int $count = null |
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): AggregateEventStream; |
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/** |
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* Load aggregate events up to a version. |
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* |
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* @param StoreStream $stream |
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* @param AggregateVersion $toVersion |
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* @param AggregateVersion $fromVersion |
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* |
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* @return AggregateEventStream |
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*/ |
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abstract protected function loadEventsTo( |
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StoreStream $stream, |
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AggregateVersion $toVersion, |
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AggregateVersion $fromVersion |
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): AggregateEventStream; |
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/** |
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* Append events to store. |
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* |
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* @param StoreStream $stream |
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* @param AggregateEventStream $eventStream |
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* @param AggregateVersion $expectedVersion |
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*/ |
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abstract protected function storeEvents( |
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StoreStream $stream, |
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AggregateEventStream $eventStream, |
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AggregateVersion $expectedVersion |
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): void; |
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/** |
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* Get current stream version. |
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* |
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* @param StoreStream $stream |
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* |
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* @return AggregateVersion |
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*/ |
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abstract protected function getStreamVersion(StoreStream $stream): AggregateVersion; |
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} |
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phpgears /
event-sourcing
