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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/message-bus project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Daikon\MessageBus; |
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use Daikon\MessageBus\Channel\ChannelInterface; |
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use Daikon\MessageBus\Channel\ChannelMap; |
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use Daikon\MessageBus\Error\ChannelUnknown; |
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use Daikon\MessageBus\Error\EnvelopeNotAcceptable; |
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use Daikon\Metadata\MetadataInterface; |
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use Daikon\Metadata\Metadata; |
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use Daikon\Metadata\MetadataEnricherInterface; |
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use Daikon\Metadata\MetadataEnricherList; |
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final class MessageBus implements MessageBusInterface |
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{ |
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private ChannelMap $channelMap; |
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private MetadataEnricherList $metadataEnrichers; |
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private string $envelopeType; |
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public function __construct( |
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ChannelMap $channelMap, |
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MetadataEnricherList $metadataEnrichers = null, |
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string $envelopeType = null |
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) { |
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$this->channelMap = $channelMap; |
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$this->metadataEnrichers = $metadataEnrichers ?? new MetadataEnricherList; |
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$this->envelopeType = $envelopeType ?? Envelope::class; |
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} |
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public function publish(MessageInterface $message, string $channelKey, MetadataInterface $metadata = null): void |
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{ |
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if (!$this->channelMap->has($channelKey)) { |
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throw new ChannelUnknown("Channel '$channelKey' has not been registered on message bus."); |
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} |
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$metadata = $this->enrichMetadata($metadata ?? Metadata::makeEmpty()); |
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$envelopeType = $this->envelopeType; |
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/** @var EnvelopeInterface $envelope */ |
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$envelope = $envelopeType::wrap($message, $metadata); |
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/** @var ChannelInterface $channel */ |
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$channel = $this->channelMap->get($channelKey); |
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$channel->publish($envelope, $this); |
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} |
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public function receive(EnvelopeInterface $envelope): void |
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{ |
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$this->verify($envelope); |
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$channelKey = (string)$envelope->getMetadata()->get(ChannelInterface::METADATA_KEY); |
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if (!$this->channelMap->has($channelKey)) { |
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throw new ChannelUnknown("Channel '$channelKey' has not been registered on message bus."); |
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} |
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/** @var ChannelInterface $channel */ |
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$channel = $this->channelMap->get($channelKey); |
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$channel->receive($envelope); |
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} |
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private function enrichMetadata(MetadataInterface $metadata): MetadataInterface |
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{ |
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return array_reduce( |
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$this->metadataEnrichers->unwrap(), |
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function (MetadataInterface $metadata, MetadataEnricherInterface $metadataEnricher): MetadataInterface { |
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return $metadataEnricher->enrich($metadata); |
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}, |
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$metadata |
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); |
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} |
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private function verify(EnvelopeInterface $envelope): void |
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{ |
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$metadata = $envelope->getMetadata(); |
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if (!$metadata->has(ChannelInterface::METADATA_KEY)) { |
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throw new EnvelopeNotAcceptable( |
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"Channel key '".ChannelInterface::METADATA_KEY."' missing in metadata of ". |
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"Envelope '{$envelope->getUuid()->toString()}' received on message bus.", |
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EnvelopeNotAcceptable::CHANNEL_KEY_MISSING |
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); |
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} |
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} |
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} |
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daikon-cqrs /
message-bus
