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<?php |
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/* |
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* To change this license header, choose License Headers in Project Properties. |
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* To change this template file, choose Tools | Templates |
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* and open the template in the editor. |
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*/ |
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namespace Governor\Framework\EventStore\Filesystem; |
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use Governor\Framework\Serializer\SimpleSerializedDomainEventData; |
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use Governor\Framework\Serializer\SerializerInterface; |
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/** |
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* Description of FilesystemEventMessageReader |
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* |
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* @author "David Kalosi" <[email protected]> |
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* @license <a href="http://www.opensource.org/licenses/mit-license.php">MIT License</a> * |
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*/ |
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class FilesystemEventMessageReader |
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{ |
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/** |
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* @var \SplFileObject |
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*/ |
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private $file; |
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function __construct(\SplFileObject $file) |
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{ |
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$this->file = $file; |
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} |
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/** |
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* |
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* @return \Governor\Framework\Serializer\SerializedDomainEventDataInterface|null |
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* @throws \RuntimeException |
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*/ |
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public function readEventMessage() |
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{ |
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if (null === $len = $this->readBytes(2)) { |
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return null; |
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} |
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$eventLength = unpack('nlength', $len); |
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if (!is_integer($eventLength['length'])) { |
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throw new \RuntimeException("Could not determine the length of the stored event"); |
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} |
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$message = $this->readBytes($eventLength['length']); |
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$array = unpack( |
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'nmagic/a36eventIdentifier/Ntimestamp/a36aggregateIdentifier/Nscn/NpayloadTypeLength', |
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$message |
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); |
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$offset = 86; |
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$array = array_merge( |
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$array, |
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unpack( |
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sprintf( |
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"a%spayloadType/NpayloadLength", |
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$array['payloadTypeLength'] |
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), |
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substr($message, $offset) |
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) |
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); |
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$offset += strlen($array['payloadType']) + 4; |
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$array = array_merge( |
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$array, |
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unpack( |
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sprintf("a%spayload/NmetaDataLength", $array['payloadLength']), |
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substr($message, $offset) |
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) |
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); |
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$offset += strlen($array['payload']) + 4; |
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$array = array_merge( |
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$array, |
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unpack( |
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sprintf("a%smetaData", $array['metaDataLength']), |
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substr($message, $offset) |
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) |
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); |
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// !!! TODO support for payload revision |
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return new SimpleSerializedDomainEventData( |
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$array['eventIdentifier'], |
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$array['aggregateIdentifier'], $array['scn'], |
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\DateTime::createFromFormat('U', $array['timestamp']), |
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$array['payloadType'], null, $array['payload'], $array['metaData'] |
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); |
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} |
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private function readBytes($length) |
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{ |
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$stream = null; |
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for ($cc = 0; $cc < $length; $cc++) { |
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if ($this->file->eof()) { |
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return null; |
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} |
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$stream .= $this->file->fgetc(); |
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} |
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return $stream; |
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} |
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} |
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SmartGecko /
GovernorFramework
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Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.