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<?php |
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declare(strict_types = 1); |
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namespace hanneskod\yaysondb\Engine; |
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use hanneskod\yaysondb\Exception\LogicException; |
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/** |
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* Simple engine for logging purposes |
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*/ |
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class LogEngine implements EngineInterface |
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{ |
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/** |
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* @var resource Log stream |
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*/ |
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private $stream; |
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/** |
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* @var DecoderInterface Decoder used to encode and deconde content |
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*/ |
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private $decoder; |
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/** |
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* @var array List of non-commited documents |
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*/ |
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private $newDocs = []; |
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public function __construct(string $fname, DecoderInterface $decoder = null) |
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{ |
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$this->stream = fopen($fname, 'a+'); |
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$this->decoder = $decoder ?: new SerializingDecoder; |
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} |
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public function getIterator(): \Generator |
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{ |
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rewind($this->stream); |
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while ($line = fgets($this->stream)) { |
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yield $this->decoder->decode($line); |
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} |
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} |
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/** |
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* @throws LogicException If id is specified |
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*/ |
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public function write(string $id, array $doc): string |
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{ |
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if ($id) { |
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throw new LogicException('Specifying a document id at write is not supported by LogEngine'); |
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} |
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$this->newDocs[] = $doc; |
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return ''; |
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} |
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public function inTransaction(): bool |
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{ |
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return !empty($this->newDocs); |
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} |
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public function reset() |
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{ |
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$this->newDocs = []; |
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} |
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public function commit() |
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{ |
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foreach ($this->newDocs as $doc) { |
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fwrite( |
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$this->stream, |
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$this->decoder->encode($doc) . PHP_EOL |
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); |
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} |
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$this->reset(); |
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} |
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/** |
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* @throws LogicException Not supported by LogEngine |
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*/ |
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public function has(string $id): bool |
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{ |
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throw new LogicException('has() is not supported by LogEngine'); |
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} |
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/** |
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* @throws LogicException Not supported by LogEngine |
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*/ |
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public function read(string $id): array |
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{ |
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throw new LogicException('read() is not supported by LogEngine'); |
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} |
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/** |
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* @throws LogicException Not supported by LogEngine |
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*/ |
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public function delete(string $id): bool |
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{ |
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throw new LogicException('delete() is not supported by LogEngine'); |
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} |
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/** |
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* @throws LogicException Not supported by LogEngine |
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*/ |
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public function clear() |
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{ |
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throw new LogicException('clear() is not supported by LogEngine'); |
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} |
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} |
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hanneskod /
yaysondb
