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<?php |
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namespace PSB\Core\Pipeline; |
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use PSB\Core\Exception\PipelineBuildingException; |
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use PSB\Core\Util\DependencyGraph\DependencyGraph; |
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use PSB\Core\Util\DependencyGraph\GraphBuilderInterface; |
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class StepDependencyGraphBuilder implements GraphBuilderInterface |
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{ |
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/** |
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* @var StepRegistration[] |
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*/ |
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private $steps; |
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/** |
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* @var StepRegistration[] |
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*/ |
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private $idToStep = []; |
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/** |
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* The actual graph maintained as an array of arrays (node id to successor ids). |
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* |
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* @var [][] |
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*/ |
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private $idDirectedGraph = []; |
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/** |
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* @param StepRegistration[] $steps |
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*/ |
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public function __construct($steps) |
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{ |
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$this->steps = $steps; |
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} |
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/** |
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* @return DependencyGraph |
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*/ |
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public function build() |
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{ |
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// prepare the directed graph lists and id to step mapping |
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foreach ($this->steps as $step) { |
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$this->idDirectedGraph[$step->getStepId()] = []; |
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$this->idToStep[$step->getStepId()] = $step; |
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} |
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// build the actual graph from before and after dependencies |
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foreach ($this->steps as $step) { |
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$this->addBeforesToDirectedGraph($step); |
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$this->addAftersToDirectedGraph($step); |
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} |
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return new DependencyGraph($this->idToStep, $this->idDirectedGraph); |
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} |
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/** |
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* @param StepRegistration $currentStep |
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* |
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* @throws PipelineBuildingException |
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*/ |
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View Code Duplication |
private function addBeforesToDirectedGraph(StepRegistration $currentStep) |
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{ |
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foreach ($currentStep->getBefores() as $before) { |
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if (!isset($this->idToStep[$before->getDependsOnId()]) && $before->isEnforced()) { |
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$allStepIds = implode(',', array_keys($this->idToStep)); |
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throw new PipelineBuildingException( |
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"Registration '{$before->getDependsOnId()}' specified in the insertbefore of the '{$currentStep->getStepId()}' step does not exist. Current step ids: $allStepIds." |
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); |
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} |
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if (isset($this->idToStep[$before->getDependsOnId()])) { |
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$this->idDirectedGraph[$before->getDependantId()][] = $before->getDependsOnId(); |
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} |
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} |
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} |
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/** |
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* @param StepRegistration $currentStep |
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* |
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* @throws PipelineBuildingException |
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*/ |
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View Code Duplication |
private function addAftersToDirectedGraph(StepRegistration $currentStep) |
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{ |
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foreach ($currentStep->getAfters() as $after) { |
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if (!isset($this->idToStep[$after->getDependsOnId()]) && $after->isEnforced()) { |
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$allStepIds = implode(',', array_keys($this->idToStep)); |
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throw new PipelineBuildingException( |
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"Registration '{$after->getDependsOnId()}' specified in the insertafter of the '{$currentStep->getStepId()}' step does not exist. Current step ids: $allStepIds." |
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); |
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} |
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if (isset($this->idToStep[$after->getDependsOnId()])) { |
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$this->idDirectedGraph[$after->getDependsOnId()][] = $after->getDependantId(); |
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} |
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} |
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} |
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} |
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phpservicebus /
core
