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<?php declare(strict_types=1); |
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namespace Initx\Driver; |
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use Initx\Envelope; |
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use Initx\Exception\IllegalStateException; |
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use Initx\Exception\NoSuchElementException; |
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use Initx\Queue; |
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use JMS\Serializer\SerializerBuilder; |
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use JMS\Serializer\SerializerInterface; |
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use Throwable; |
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final class FilesystemQueue implements Queue |
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{ |
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use HasFallbackSerializer; |
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/** |
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* @var string |
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*/ |
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private $path; |
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/** |
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* @var SerializerInterface |
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*/ |
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private $serializer; |
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public function __construct(string $path, SerializerInterface $serializer = null) |
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{ |
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$this->serializer = $serializer; |
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$this->path = $path; |
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$this->fallbackSerializer(); |
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} |
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/** |
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* Inserts an element if possible, otherwise throwing exception. |
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* |
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* @param Envelope $envelope |
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* @return void |
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* @throws IllegalStateException |
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*/ |
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public function add(Envelope $envelope): void |
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{ |
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if (!$this->offer($envelope)) { |
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throw IllegalStateException::create("Could not write to {$this->path}"); |
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} |
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} |
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/** |
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* Inserts an element if possible. |
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* |
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* @param Envelope $envelope |
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* @return void |
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*/ |
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public function offer(Envelope $envelope): bool |
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{ |
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$content = $this->serializer->serialize($envelope, 'json').PHP_EOL; |
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try { |
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$result = (bool)file_put_contents( |
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$this->path, |
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$content, |
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FILE_APPEND |
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); |
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} catch (Throwable $exception) { |
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$result = false; |
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} |
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return $result; |
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} |
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/** |
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* Remove and return head of queue, otherwise throwing exception. |
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* |
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* @return Envelope |
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* @throws NoSuchElementException | IllegalStateException |
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*/ |
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public function remove(): Envelope |
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{ |
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if (!$envelope = $this->poll()) { |
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throw new NoSuchElementException('Queue empty'); |
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} |
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return $envelope; |
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} |
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private function removeFirstLine(): ?string |
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{ |
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if (!file_exists($this->path)) { |
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throw new IllegalStateException("File $this->path not exists"); |
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} |
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$firstLine = null; |
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if ($handle = fopen($this->path, 'cb+')) { |
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if (!flock($handle, LOCK_EX)) { |
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fclose($handle); |
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} |
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$offset = 0; |
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$len = filesize($this->path); |
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while (($line = fgets($handle, 4096)) !== false) { |
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if (!$firstLine) { |
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$firstLine = $line; |
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$offset = strlen($firstLine); |
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continue; |
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} |
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$pos = ftell($handle); |
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fseek($handle, $pos - strlen($line) - $offset); |
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fwrite($handle, $line); |
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fseek($handle, $pos); |
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} |
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fflush($handle); |
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ftruncate($handle, $len - $offset); |
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flock($handle, LOCK_UN); |
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fclose($handle); |
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} |
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return $firstLine; |
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} |
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private function readFirstLine(): ?string |
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{ |
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if (!file_exists($this->path)) { |
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throw new IllegalStateException("File $this->path not exists"); |
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} |
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$firstLine = fgets(fopen($this->path, 'rb')); |
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return $firstLine ?: null; |
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} |
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/** |
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* Remove and return head of queue, otherwise returning null. |
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* |
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* @return Envelope | null |
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* @throws IllegalStateException |
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*/ |
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public function poll(): ?Envelope |
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{ |
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$firstLine = $this->removeFirstLine(); |
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if (!$firstLine) { |
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return null; |
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} |
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return $this->serializer->deserialize($firstLine, Envelope::class, 'json'); |
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} |
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/** |
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* Return but do not remove head of queue, otherwise throwing exception. |
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* |
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* @return Envelope |
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* @throws NoSuchElementException | IllegalStateException |
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*/ |
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public function element(): Envelope |
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{ |
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if (!$envelope = $this->peek()) { |
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throw new NoSuchElementException('Queue empty'); |
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} |
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return $envelope; |
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} |
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/** |
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* Return but do not remove head of queue, otherwise returning null. |
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* |
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* @return Envelope | null |
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* @throws IllegalStateException |
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*/ |
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4 |
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public function peek(): ?Envelope |
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{ |
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$firstLine = $this->readFirstLine(); |
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if (!$firstLine) { |
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return null; |
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} |
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return $this->serializer->deserialize($firstLine, Envelope::class, 'json'); |
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} |
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} |
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initx /
querabilis
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