Daikon\MessageBus\Channel\Subscription\Subscription

Complexity

Total Complexity

14

Size/Duplication

Total Lines	92
Duplicated Lines	18.48 %

Coupling/Cohesion

Components	2
Dependencies	7

Test Coverage

Coverage

100%

Importance

Changes

0

<?php declare(strict_types=1);
    private string $key;

    private TransportInterface $transport;

    private MessageHandlerList $messageHandlers;

    private Closure $guard;

    private MetadataEnricherList $metadataEnrichers;

    public function __construct(
        string $key,
        TransportInterface $transport,
        MessageHandlerList $messageHandlers,
        Closure $guard = null,
        MetadataEnricherList $metadataEnrichers = null
    ) {
        $this->key = $key;
        $this->transport = $transport;
        $this->messageHandlers = $messageHandlers;
        $this->guard = $guard ?? fn(): bool => true;

A parse error occurred: Syntax error, unexpected ':', expecting T_DOUBLE_ARROW on line 43 at column 37

        $metadataEnrichers = $metadataEnrichers ?? new MetadataEnricherList;
        $this->metadataEnrichers = $metadataEnrichers->prependEnricher(self::METADATA_KEY, $this->key);
    }

    public function publish(EnvelopeInterface $envelope, MessageBusInterface $messageBus): void
    {
        $envelope = $this->enrichMetadata($envelope);
        if ($this->accepts($envelope)) {
            $this->transport->send($envelope, $messageBus);
        }
    }

    public function receive(EnvelopeInterface $envelope): void
    {
        $this->verify($envelope);
        foreach ($this->messageHandlers as $messageHandler) {
            $messageHandler->handle($envelope);
        }
    }

    public function getKey(): string
    {
        return $this->key;
    }

    private function enrichMetadata(EnvelopeInterface $envelope): EnvelopeInterface
    {
        return $envelope->withMetadata(array_reduce(
            $this->metadataEnrichers->unwrap(),
            function (MetadataInterface $metadata, MetadataEnricherInterface $metadataEnricher): MetadataInterface {
                return $metadataEnricher->enrich($metadata);
            },
            $envelope->getMetadata()
        ));
    }

    private function accepts(EnvelopeInterface $envelope): bool
    {
        return (bool)call_user_func($this->guard, $envelope);
    }

    private function verify(EnvelopeInterface $envelope): void
    {
        $metadata = $envelope->getMetadata();
        if (!$metadata->has(self::METADATA_KEY)) {
            throw new EnvelopeNotAcceptable(
                "Subscription key '".self::METADATA_KEY."' missing in metadata of Envelope ".
                "'{$envelope->getUuid()->toString()}' received by subscription '{$this->key}'.",
                EnvelopeNotAcceptable::SUBSCRIPTION_KEY_MISSING
            );
        }
        $subscriptionKey = $metadata->get(self::METADATA_KEY);
        if ($subscriptionKey !== $this->key) {
            throw new EnvelopeNotAcceptable(
                "Subscription '{$this->key}' inadvertently received Envelope ".
                "'{$envelope->getUuid()->toString()}' for subscription '$subscriptionKey'.",
                EnvelopeNotAcceptable::SUBSCRIPTION_KEY_UNEXPECTED
            );
        }
    }
}