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<?php |
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namespace Bdf\Pipeline; |
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use Bdf\Pipeline\Processor\StackProcessor; |
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/** |
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* Pipeline |
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* |
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* @author Johnmeurt |
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*/ |
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final class Pipeline |
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{ |
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/** |
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* The pipe processor |
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* |
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* @var ProcessorInterface |
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*/ |
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private $processor; |
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/** |
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* The first pipe from the chain |
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* |
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* @var Pipe |
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*/ |
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private $first; |
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/** |
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* The last pipe from the chain |
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* |
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* @var Pipe |
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*/ |
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private $last; |
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/** |
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* The destination of the last pipe |
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* |
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* @var callable |
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*/ |
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private $outlet; |
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/** |
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* Pipeline constructor. |
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* |
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* @param array $pipes |
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* @param ProcessorInterface $processor |
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*/ |
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public function __construct(array $pipes = [], ProcessorInterface $processor = null) |
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{ |
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$this->processor = $processor ?: new StackProcessor(); |
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// Set the default outlet |
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$this->outlet = function($payload) { |
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return $payload; |
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}; |
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foreach ($pipes as $pipe) { |
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$this->pipe($pipe); |
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} |
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} |
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/** |
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* Add a pipe at the beginning of the chain |
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* |
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* @param callable $first |
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*/ |
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public function prepend($first) |
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{ |
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$this->add($first, true); |
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} |
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/** |
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* Add a pipe |
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* |
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* @param callable $last |
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*/ |
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public function pipe($last) |
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{ |
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$this->add($last); |
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} |
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/** |
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* Add a pipe |
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* |
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* @param callable $pipe |
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* @param boolean $prepend |
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*/ |
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private function add($pipe, $prepend = false) |
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{ |
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// Set the outlet on last pipe |
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$pipe = new Pipe($this->processor, $pipe); |
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$pipe->setNext($this->outlet); |
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// Detect the first pipe |
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if ($this->first === null) { |
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$this->first = $pipe; |
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$this->last = $pipe; |
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} elseif ($prepend === false) { |
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$this->last->setNext($pipe); |
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$this->last = $pipe; |
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} else { |
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$pipe->setNext($this->first); |
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$this->first = $pipe; |
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} |
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} |
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/** |
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* Set the pipeline outlet |
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* |
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* @param callable $outlet |
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*/ |
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public function outlet(callable $outlet) |
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{ |
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$this->outlet = $outlet; |
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if ($this->last !== null) { |
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$this->last->setNext($outlet); |
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} |
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} |
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/** |
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* Send the payload into the pipeline. |
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* |
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* @param array $payload |
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* |
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* @return mixed |
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*/ |
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public function send(...$payload) |
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{ |
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$callback = $this->first ?: $this->outlet; |
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return $callback(...$payload); |
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} |
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/** |
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* Clone the pipes |
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*/ |
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public function __clone() |
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{ |
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if ($this->first !== null) { |
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$this->first = clone $this->first; |
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} |
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} |
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} |
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b2pweb /
bdf-pipeline
