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<?php |
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/** |
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* Event Sourcing implementation. |
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* |
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* @author Maksim Masiukevich <[email protected]> |
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* @license MIT |
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* @license https://opensource.org/licenses/MIT |
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*/ |
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declare(strict_types = 1); |
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namespace ServiceBus\EventSourcing\Snapshots; |
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use function Amp\call; |
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use Amp\Promise; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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use ServiceBus\EventSourcing\Aggregate; |
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use ServiceBus\EventSourcing\AggregateId; |
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use ServiceBus\EventSourcing\Snapshots\Store\SnapshotStore; |
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use ServiceBus\EventSourcing\Snapshots\Triggers\SnapshotTrigger; |
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/** |
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* |
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*/ |
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final class Snapshotter |
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{ |
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/** @var SnapshotStore */ |
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private $store; |
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/** |
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* Snapshot generation trigger. |
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* |
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* @var SnapshotTrigger |
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*/ |
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private $trigger; |
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/** @var LoggerInterface */ |
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private $logger; |
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public function __construct( |
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SnapshotStore $store, |
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SnapshotTrigger $trigger, |
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LoggerInterface $logger = null |
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) { |
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$this->store = $store; |
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$this->trigger = $trigger; |
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$this->logger = $logger ?? new NullLogger(); |
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} |
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/** |
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* Load snapshot for aggregate. |
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* |
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* Returns \ServiceBus\EventSourcing\Snapshots\Snapshot|null |
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*/ |
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public function load(AggregateId $id): Promise |
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{ |
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return call( |
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function() use ($id): \Generator |
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{ |
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$snapshot = null; |
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try |
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{ |
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/** @var Snapshot|null $snapshot */ |
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$snapshot = yield $this->store->load($id); |
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} |
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catch (\Throwable $throwable) |
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{ |
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$this->logger->error( |
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'Error loading snapshot of aggregate with identifier "{aggregateIdClass}:{aggregateId}"', |
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[ |
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'aggregateIdClass' => \get_class($id), |
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'aggregateId' => $id->toString(), |
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'throwableMessage' => $throwable->getMessage(), |
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'throwablePoint' => \sprintf('%s:%d', $throwable->getFile(), $throwable->getLine()), |
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] |
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); |
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} |
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return $snapshot; |
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} |
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); |
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} |
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/** |
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* Store new snapshot. |
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*/ |
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public function store(Snapshot $snapshot): Promise |
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{ |
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return call( |
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function() use ($snapshot): \Generator |
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{ |
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$id = $snapshot->aggregate->id(); |
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try |
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{ |
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yield $this->store->remove($id); |
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yield $this->store->save($snapshot); |
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} |
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catch (\Throwable $throwable) |
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{ |
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$this->logger->error( |
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'Error saving snapshot of aggregate with identifier "{aggregateIdClass}:{aggregateId}"', |
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[ |
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'aggregateIdClass' => \get_class($id), |
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'aggregateId' => $id->toString(), |
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'throwableMessage' => $throwable->getMessage(), |
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'throwablePoint' => \sprintf('%s:%d', $throwable->getFile(), $throwable->getLine()), |
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] |
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); |
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} |
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finally |
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{ |
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unset($id); |
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} |
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} |
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); |
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} |
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/** |
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* A snapshot must be created. |
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*/ |
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7 |
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public function snapshotMustBeCreated(Aggregate $aggregate, Snapshot $previousSnapshot = null): bool |
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{ |
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return $this->trigger->snapshotMustBeCreated($aggregate, $previousSnapshot); |
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} |
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} |
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php-service-bus /
event-sourcing
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