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<?php |
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/* |
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* cqrs-symfony-messenger (https://github.com/phpgears/cqrs-symfony-messenger). |
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* CQRS implementation with Symfony's Messenger. |
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* |
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* @license MIT |
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* @link https://github.com/phpgears/cqrs-symfony-messenger |
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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\CQRS\Symfony\Messenger; |
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use Gears\CQRS\Command; |
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use Gears\CQRS\CommandHandler; |
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use Gears\CQRS\Exception\InvalidCommandException; |
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use Gears\CQRS\Exception\InvalidCommandHandlerException; |
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use Symfony\Component\Messenger\Envelope; |
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use Symfony\Component\Messenger\Handler\HandlerDescriptor; |
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use Symfony\Component\Messenger\Handler\HandlersLocatorInterface; |
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class CommandHandlerLocator implements HandlersLocatorInterface |
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{ |
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/** |
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* Command handlers map. |
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* |
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* @var mixed[] |
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*/ |
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protected $handlersMap; |
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/** |
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* CommandHandlerLocator constructor. |
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* |
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* @param mixed[] $handlers |
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*/ |
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public function __construct(array $handlers) |
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{ |
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$handlers = \array_map( |
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function ($handler) { |
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if (!\is_array($handler)) { |
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$handler = [$handler]; |
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} |
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if (\count($handler) !== 1) { |
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throw new InvalidCommandHandlerException(\sprintf( |
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'Only one command handler allowed, %s given', |
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\count($handler) |
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)); |
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} |
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return $handler; |
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}, |
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$handlers |
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); |
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$this->handlersMap = $handlers; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws InvalidCommandHandlerException |
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*/ |
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public function getHandlers(Envelope $envelope): iterable |
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{ |
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$seen = []; |
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foreach ($this->getCommandMap($envelope) as $type) { |
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foreach ($this->handlersMap[$type] ?? [] as $alias => $handler) { |
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if (!$handler instanceof CommandHandler) { |
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throw new InvalidCommandHandlerException(\sprintf( |
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'Command handler must implement %s interface, %s given', |
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CommandHandler::class, |
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\is_object($handler) ? \get_class($handler) : \gettype($handler) |
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)); |
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} |
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$handlerCallable = function (Command $command) use ($handler): void { |
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$handler->handle($command); |
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}; |
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if (!\in_array($handlerCallable, $seen, true)) { |
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$seen[] = $handlerCallable; |
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yield $alias => new HandlerDescriptor($handlerCallable); |
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} |
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} |
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} |
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} |
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/** |
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* Get command mapping. |
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* |
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* @param Envelope $envelope |
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* |
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* @throws InvalidCommandException |
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* |
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* @return mixed[] |
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*/ |
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final protected function getCommandMap(Envelope $envelope): array |
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{ |
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/** @var mixed $command */ |
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$command = $envelope->getMessage(); |
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if (!$command instanceof Command) { |
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throw new InvalidCommandException(\sprintf( |
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'Command must implement %s interface, %s given', |
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Command::class, |
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\is_object($command) ? \get_class($command) : \gettype($command) |
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)); |
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} |
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$class = \get_class($command); |
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return [$class => $class] |
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+ ['*' => '*']; |
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} |
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} |
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phpgears /
cqrs-symfony-messenger
