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<?php |
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/* |
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* This file is part of YaEtl. |
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* (c) Fabrice de Stefanis / https://github.com/fab2s/YaEtl |
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* This source file is licensed under the MIT license which you will |
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* find in the LICENSE file or at https://opensource.org/licenses/MIT |
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*/ |
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namespace fab2s\YaEtl\Extractors; |
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use fab2s\NodalFlow\NodalFlowException; |
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use fab2s\NodalFlow\Nodes\PayloadNodeAbstract; |
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/** |
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* Class ExtractorAbstract |
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*/ |
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class CallableExtractor extends PayloadNodeAbstract implements ExtractorInterface |
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{ |
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/** |
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* The underlying executable or traversable Payload |
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* |
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* @var callable |
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*/ |
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protected $payload; |
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/** |
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* The record collection |
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* |
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* @var \Traversable |
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*/ |
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protected $extracted; |
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/** |
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* @var array |
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*/ |
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protected $nodeIncrements = [ |
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'num_records' => 'num_iterate', |
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'num_extract' => 0, |
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]; |
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/** |
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* CallableExtractorAbstract constructor. |
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* |
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* @param callable $payload |
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* @param bool $isAReturningVal |
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* |
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* @throws NodalFlowException |
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*/ |
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public function __construct(callable $payload, $isAReturningVal = true) |
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{ |
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parent::__construct($payload, $isAReturningVal, true); |
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} |
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/** |
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* This method is vaguely similar to a valid() meta iterator |
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* It will triggers the record collection extraction when called |
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* and return true when records where fetched. |
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* |
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* This is useful when batch extracting. If your extractor |
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* does not perform batch extract (for example if you are |
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* just reading a file line by line), just make so this method |
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* triggers file open and return true in case of success and false |
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* when called again. |
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* |
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* @param mixed|null $param |
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* |
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* @return bool false in case no more records can be fetched |
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*/ |
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public function extract($param = null) |
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{ |
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$this->extracted = \call_user_func($this->payload, $param); |
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if (!is_array($this->extracted) && !($this->extracted instanceof \Traversable)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* get the traversable to traverse within the Flow |
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* |
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* @param mixed $param |
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* |
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* @return \Generator |
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*/ |
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public function getTraversable($param) |
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{ |
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$this->extract($param); |
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$this->getCarrier()->getFlowMap()->incrementNode($this->getId(), 'num_extract'); |
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foreach ($this->extracted as $record) { |
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yield $record; |
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} |
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} |
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} |
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fab2s /
YaEtl
