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<?php |
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namespace Spatie\EventProjector; |
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use Exception; |
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use Illuminate\Support\Collection; |
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use Spatie\EventProjector\EventHandlers\EventHandler; |
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use Spatie\EventProjector\EventHandlers\EventHandlerCollection; |
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use Spatie\EventProjector\Events\EventHandlerFailedHandlingEvent; |
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use Spatie\EventProjector\Events\FinishedEventReplay; |
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use Spatie\EventProjector\Events\ProjectorDidNotHandlePriorEvents; |
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use Spatie\EventProjector\Events\StartingEventReplay; |
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use Spatie\EventProjector\Models\StoredEvent; |
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use Spatie\EventProjector\Projectors\Projector; |
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use Illuminate\Contracts\Container\Container; |
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use Spatie\EventProjector\Exceptions\InvalidEventHandler; |
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class Projectionist |
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{ |
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/** @var array */ |
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protected $config; |
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/** @var \Spatie\EventProjector\EventHandlers\EventHandlerCollection */ |
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protected $projectors; |
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/** @var \Spatie\EventProjector\EventHandlers\EventHandlerCollection */ |
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protected $reactors; |
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/** @var bool */ |
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protected $isReplayingEvents = false; |
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public function __construct(array $config) |
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{ |
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$this->projectors = new EventHandlerCollection(); |
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$this->reactors = new EventHandlerCollection(); |
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$this->config = $config; |
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} |
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public function addProjector($projector): Projectionist |
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{ |
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if (is_string($projector)) { |
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$projector = app($projector); |
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} |
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if (! $projector instanceof Projector) { |
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throw InvalidEventHandler::notAProjector($projector); |
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} |
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$this->projectors->add($projector); |
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return $this; |
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} |
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public function addProjectors(array $projectors): Projectionist |
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{ |
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foreach($projectors as $projector) { |
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$this->addProjector($projector); |
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} |
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return $this; |
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} |
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public function getProjectors(): Collection |
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{ |
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return $this->projectors->all(); |
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} |
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public function getProjector(string $name): ?Projector |
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{ |
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return $this->projectors->all()->first(function (Projector $projector) use ($name) { |
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return $projector->getName() === $name; |
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}); |
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} |
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public function addReactor($reactor): Projectionist |
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{ |
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if (is_string($reactor)) { |
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$reactor = app($reactor); |
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} |
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if (! $reactor instanceof EventHandler) { |
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throw InvalidEventHandler::notAnEventHandler($reactor); |
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} |
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$this->reactors->add($reactor); |
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return $this; |
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} |
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public function addReactors(array $reactors): Projectionist |
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{ |
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foreach ($reactors as $reactor) { |
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$this->addReactor($reactor); |
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} |
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return $this; |
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} |
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public function getReactors(): Collection |
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{ |
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return $this->reactors->all(); |
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} |
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public function storeEvent(ShouldBeStored $event) |
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{ |
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$storedEvent = $this->config['stored_event_model']::createForEvent($event); |
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$this->handleImmediately($storedEvent); |
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dispatch(new HandleStoredEventJob($storedEvent)) |
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->onQueue($this->config['queue']); |
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} |
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public function handle(StoredEvent $storedEvent) |
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{ |
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$this->applyStoredEventToProjectors( |
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$storedEvent, |
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$this->projectors->forEvent($storedEvent) |
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); |
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$this->applyStoredEventToReactors( |
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$storedEvent, |
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$this->reactors->forEvent($storedEvent) |
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); |
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} |
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public function handleImmediately(StoredEvent $storedEvent) |
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{ |
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$projectors = $this->projectors |
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->forEvent($storedEvent) |
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->filter(function (Projector $projector) { |
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return $projector->shouldBeCalledImmediately(); |
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}); |
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$this->applyStoredEventToProjectors($storedEvent, $projectors); |
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} |
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protected function applyStoredEventToProjectors(StoredEvent $storedEvent, Collection $projectors) |
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{ |
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foreach ($projectors as $projector) { |
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if ($projector->hasAlreadyReceivedEvent($storedEvent)) { |
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continue; |
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} |
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if (! $projector->hasReceivedAllPriorEvents($storedEvent)) { |
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event(new ProjectorDidNotHandlePriorEvents($projector, $storedEvent)); |
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$projector->markAsNotUpToDate($storedEvent); |
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continue; |
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} |
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if (! $this->callEventHandler($projector, $storedEvent)) { |
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continue; |
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} |
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$projector->rememberReceivedEvent($storedEvent); |
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} |
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} |
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protected function applyStoredEventToReactors(StoredEvent $storedEvent, Collection $reactors) |
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{ |
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foreach ($reactors as $reactor) { |
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$this->callEventHandler($reactor, $storedEvent); |
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} |
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} |
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protected function callEventHandler(EventHandler $eventHandler, StoredEvent $storedEvent): bool |
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{ |
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try { |
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$eventHandler->handle($storedEvent); |
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} catch (Exception $exception) { |
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if (! $this->config['catch_exceptions']) { |
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throw $exception; |
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} |
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$eventHandler->handleException($exception); |
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event(new EventHandlerFailedHandlingEvent($eventHandler, $storedEvent, $exception)); |
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return false; |
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} |
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return true; |
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} |
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public function isReplayingEvents(): bool |
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{ |
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return $this->isReplayingEvents; |
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} |
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public function replayEvents(Collection $projectors, int $afterStoredEventId = 0, callable $onEventReplayed = null) |
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{ |
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$this->isReplayingEvents = true; |
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event(new StartingEventReplay($projectors)); |
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$this->projectors->call('onStartingEventReplay'); |
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StoredEvent::query() |
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->after($afterStoredEventId ?? 0) |
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->chunk($this->config['replay_chunk_size'], function (Collection $storedEvents) use ($projectors, $onEventReplayed) { |
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$storedEvents->each(function (StoredEvent $storedEvent) use ($projectors, $onEventReplayed) { |
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$this->applyStoredEventToProjectors($storedEvent, $this->projectors->all()); |
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if ($onEventReplayed) { |
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$onEventReplayed($storedEvent); |
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} |
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}); |
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}); |
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$this->isReplayingEvents = false; |
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event(new FinishedEventReplay()); |
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$this->projectors->call('onFinishedEventReplay'); |
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} |
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} |
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spatie /
laravel-event-projector
