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<?php |
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namespace Spatie\EventSourcing\EventHandlers; |
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use Exception; |
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use Illuminate\Support\Collection; |
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use ReflectionClass; |
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use ReflectionMethod; |
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use ReflectionParameter; |
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use Spatie\EventSourcing\Exceptions\InvalidEventHandler; |
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use Spatie\EventSourcing\ShouldBeStored; |
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use Spatie\EventSourcing\StoredEvent; |
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trait HandlesEvents |
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{ |
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public function handles(): array |
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{ |
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return $this->getEventHandlingMethods()->keys()->toArray(); |
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} |
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public function handle(StoredEvent $storedEvent) |
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{ |
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$eventClass = $storedEvent->event_class; |
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$handlerClassOrMethod = $this->getEventHandlingMethods()->get($eventClass); |
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$parameters = [ |
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'event' => $storedEvent->event, |
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'storedEvent' => $storedEvent, |
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'aggregateUuid' => $storedEvent->aggregate_uuid, |
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]; |
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if (class_exists($handlerClassOrMethod)) { |
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return app()->call([app($handlerClassOrMethod), '__invoke'], $parameters); |
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} |
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if (! method_exists($this, $handlerClassOrMethod)) { |
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throw InvalidEventHandler::eventHandlingMethodDoesNotExist($this, $storedEvent->event, $handlerClassOrMethod); |
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} |
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app()->call([$this, $handlerClassOrMethod], $parameters); |
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} |
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public function handleException(Exception $exception): void |
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{ |
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report($exception); |
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} |
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public function getEventHandlingMethods(): Collection |
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{ |
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if (! isset($this->handlesEvents) && ! isset($this->handleEvent)) { |
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return $this->autoDetectHandlesEvents(); |
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} |
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$handlesEvents = collect($this->handlesEvents ?? []) |
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->mapWithKeys(function (string $handlerMethod, $eventClass) { |
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if (is_numeric($eventClass)) { |
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return [$handlerMethod => 'on'.ucfirst(class_basename($handlerMethod))]; |
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} |
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return [$eventClass => $handlerMethod]; |
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}); |
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if ($this->handleEvent ?? false) { |
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$handlesEvents->put($this->handleEvent, get_class($this)); |
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} |
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return $handlesEvents; |
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} |
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private function autoDetectHandlesEvents(): Collection |
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{ |
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return collect((new ReflectionClass($this))->getMethods()) |
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->flatMap(function (ReflectionMethod $method) { |
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$method = new ReflectionMethod($this, $method->name); |
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if (! $method->isPublic()) { |
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return; |
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} |
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$eventClass = collect($method->getParameters()) |
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->map(fn(ReflectionParameter $parameter) => optional($parameter->getType())->getName()) |
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->first(fn($typeHint) => is_subclass_of($typeHint, ShouldBeStored::class)); |
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if (! $eventClass) { |
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return; |
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} |
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return [$eventClass => $method->name]; |
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}) |
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->filter(); |
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} |
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} |
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spatie /
laravel-event-sourcing
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