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<?php |
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namespace Spatie\EventProjector; |
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use Illuminate\Support\Collection; |
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use Spatie\EventProjector\Models\StoredEvent; |
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use Spatie\EventProjector\Projectors\Projector; |
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use Spatie\EventProjector\Events\FinishedEventReplay; |
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use Spatie\EventProjector\Events\StartingEventReplay; |
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use Spatie\EventProjector\Exceptions\InvalidEventHandler; |
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use Spatie\EventProjector\Events\ProjectorDidNotHandlePriorEvents; |
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class EventProjectionist |
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{ |
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/** @var \Illuminate\Support\Collection */ |
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protected $projectors; |
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/** @var \Illuminate\Support\Collection */ |
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protected $reactors; |
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/** @var bool */ |
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protected $isReplayingEvents = false; |
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/** @var int */ |
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protected $replayChunkSize; |
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public function __construct(array $config) |
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{ |
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$this->projectors = collect(); |
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$this->reactors = collect(); |
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$this->replayChunkSize = $config['replay_chunk_size'] ?? 1000; |
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} |
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public function isReplayingEvents(): bool |
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{ |
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return $this->isReplayingEvents; |
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} |
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public function addProjector($projector): self |
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{ |
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$this->guardAgainstInvalidEventHandler($projector); |
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$this->projectors->push($projector); |
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return $this; |
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} |
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public function addProjectors(array $projectors): self |
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{ |
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collect($projectors)->each(function ($projector) { |
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$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; |
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} |
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public function getProjector(string $name): ?Projector |
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{ |
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return $this |
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->instantiate($this->projectors) |
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->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): self |
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{ |
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$this->guardAgainstInvalidEventHandler($reactor); |
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$this->reactors->push($reactor); |
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return $this; |
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} |
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public function addReactors(array $reactors): self |
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{ |
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collect($reactors)->each(function ($reactor) { |
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$this->addReactor($reactor); |
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}); |
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return $this; |
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} |
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public function handle(StoredEvent $storedEvent) |
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{ |
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$this |
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->callEventHandlers($this->projectors, $storedEvent) |
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->callEventHandlers($this->reactors, $storedEvent); |
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} |
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protected function callEventHandlers(Collection $eventHandlers, StoredEvent $storedEvent): self |
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{ |
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$eventHandlers |
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->pipe(function (Collection $eventHandler) { |
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return $this->instantiate($eventHandler); |
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}) |
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->filter(function (object $eventHandler) use ($storedEvent) { |
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if ($eventHandler instanceof Projector) { |
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if (!$eventHandler->hasReceivedAllPriorEvents($storedEvent)) { |
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event(new ProjectorDidNotHandlePriorEvents($eventHandler, $storedEvent)); |
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return false; |
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} |
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} |
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return true; |
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}) |
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->each(function (object $eventHandler) use ($storedEvent) { |
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$this->callEventHandler($eventHandler, $storedEvent); |
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if ($eventHandler instanceof Projector) { |
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$eventHandler->rememberReceivedEvent($storedEvent); |
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} |
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}); |
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return $this; |
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} |
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protected function callEventHandler(object $eventHandler, StoredEvent $storedEvent) |
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{ |
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if (!isset($eventHandler->handlesEvents)) { |
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throw InvalidEventHandler::cannotHandleEvents($eventHandler); |
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} |
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$event = $storedEvent->event; |
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if (!$method = $eventHandler->handlesEvents[get_class($event)] ?? false) { |
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return; |
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} |
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if (!method_exists($eventHandler, $method)) { |
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throw InvalidEventHandler::eventHandlingMethodDoesNotExist($eventHandler, $event, $method); |
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} |
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app()->call([$eventHandler, $method], compact('event', 'storedEvent')); |
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} |
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public function replayEvents(Collection $projectors, callable $onEventReplayed) |
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{ |
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$this->isReplayingEvents = true; |
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event(new StartingEventReplay()); |
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$projectors = $this |
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->instantiate($projectors) |
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->each->resetStatus(); |
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$this->callMethod($projectors, 'onStartingEventReplay'); |
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StoredEvent::chunk($this->replayChunkSize, function (Collection $storedEvents) use ($projectors, $onEventReplayed) { |
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$storedEvents->each(function (StoredEvent $storedEvent) use ($projectors, $onEventReplayed) { |
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$this->callEventHandlers($projectors, $storedEvent); |
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$onEventReplayed($storedEvent); |
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}); |
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}); |
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$this->isReplayingEvents = false; |
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event(new FinishedEventReplay()); |
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$this->callMethod($projectors, 'onFinishedEventReplay'); |
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} |
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protected function guardAgainstInvalidEventHandler($eventHandler) |
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{ |
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if (!is_string($eventHandler)) { |
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return; |
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} |
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if (!class_exists($eventHandler)) { |
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throw InvalidEventHandler::doesNotExist($eventHandler); |
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} |
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} |
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protected function instantiate(Collection $eventHandlers) |
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{ |
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return $eventHandlers->map(function ($eventHandler) { |
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if (is_string($eventHandler)) { |
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$eventHandler = app($eventHandler); |
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} |
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return $eventHandler; |
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}); |
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} |
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protected function callMethod(Collection $eventHandlers, string $method): self |
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{ |
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$eventHandlers |
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->filter(function (object $eventHandler) use ($method) { |
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return method_exists($eventHandler, $method); |
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}) |
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->each(function (object $eventHandler) use ($method) { |
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return app()->call([$eventHandler, $method]); |
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}); |
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return $this; |
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} |
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} |
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spatie /
laravel-event-projector
