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<?php |
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namespace MeadSteve\Tale; |
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use MeadSteve\Tale\Execution\CompletedStep; |
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use MeadSteve\Tale\Execution\Failure; |
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use MeadSteve\Tale\Execution\Success; |
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use MeadSteve\Tale\Execution\TransactionResult; |
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use MeadSteve\Tale\Steps\FinalisingStep; |
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use MeadSteve\Tale\Steps\NamedStep; |
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use MeadSteve\Tale\Steps\Step; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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class Transaction |
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{ |
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/** |
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* @var Step[] |
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*/ |
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private $steps = []; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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public function __construct(LoggerInterface $logger = null) |
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{ |
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if ($logger === null) { |
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$logger = new NullLogger(); |
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} |
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$this->logger = $logger; |
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} |
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public function addStep(Step $step): Transaction |
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{ |
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$this->logger->debug("Adding {$this->stepName($step)} to transaction definition"); |
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$this->steps[] = $step; |
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return $this; |
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} |
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/** |
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* Runs each step in the transaction |
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* |
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* @param mixed $startingState the state to pass in to the first step |
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* @return TransactionResult |
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*/ |
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public function run($startingState = null): TransactionResult |
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{ |
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$this->logger->debug("Running transaction"); |
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$state = $startingState; |
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$completedSteps = []; |
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foreach ($this->steps as $key => $step) { |
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try { |
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$this->logger->debug("Executing {$this->stepName($step)} step [$key]"); |
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$state = $step->execute($state); |
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$completedSteps[] = new CompletedStep($step, $state, $key); |
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$this->logger->debug("Execution of {$this->stepName($step)} step [$key] complete"); |
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} catch (\Throwable $failure) { |
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$this->logger->debug("Failed executing {$this->stepName($step)} step [$key]"); |
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$this->revertCompletedSteps($completedSteps); |
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$this->logger->debug("Finished compensating all previous steps"); |
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return new Failure($failure); |
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} |
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} |
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$this->finaliseSteps($completedSteps); |
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return new Success($state); |
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} |
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/** |
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* @param CompletedStep[] $completedSteps |
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*/ |
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private function revertCompletedSteps(array $completedSteps) |
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{ |
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foreach (array_reverse($completedSteps) as $completedStep) { |
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$step = $completedStep->step; |
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$stepId = $completedStep->stepId; |
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$this->logger->debug("Compensating for step {$this->stepName($step)} [{$stepId}]"); |
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$step->compensate($completedStep->state); |
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$this->logger->debug("Compensation complete for step {$this->stepName($step)} [{$stepId}]"); |
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} |
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} |
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/** |
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* @param CompletedStep[] $completedSteps |
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*/ |
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private function finaliseSteps($completedSteps) |
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{ |
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$stepsToFinalise = array_filter($completedSteps, function (CompletedStep $x) { |
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return $x->step instanceof FinalisingStep; |
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}); |
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foreach ($stepsToFinalise as $completedStep) { |
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$step = $completedStep->step; |
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$stepId = $completedStep->stepId; |
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$this->logger->debug("Finalising step {$this->stepName($step)} [{$stepId}]"); |
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$step->finalise($completedStep->state); |
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$this->logger->debug("Finalising step {$this->stepName($step)} [{$stepId}]"); |
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} |
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} |
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private function stepName(Step $step): string |
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{ |
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if ($step instanceof NamedStep) { |
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return "`{$step->stepName()}`"; |
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} |
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return "anonymous step"; |
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} |
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} |
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meadsteve /
Tale
