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<?php |
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namespace Metabor\Statemachine\Observer; |
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use Metabor\Statemachine\Statemachine; |
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use Metabor\StringConverter; |
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use MetaborStd\Statemachine\StatemachineInterface; |
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use MetaborStd\Statemachine\TransitionInterface; |
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use MetaborStd\StringConverterInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\LogLevel; |
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/** |
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* @author otischlinger |
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*/ |
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class TransitionLogger implements \SplObserver |
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{ |
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const CONTEXT_SUBJECT = 'subject'; |
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const CONTEXT_CURRENT_STATE = 'currentState'; |
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const CONTEXT_LAST_STATE = 'lastState'; |
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const CONTEXT_TRANSITION = 'transition'; |
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/** |
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* @var LoggerInterface |
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*/ |
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protected $logger; |
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/** |
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* @var string |
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*/ |
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protected $loggerLevel; |
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/** |
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* @var StringConverterInterface |
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*/ |
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private $stringConverter; |
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/** |
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* @param LoggerInterface $logger |
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* @param string $loggerLevel |
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* @param StringConverterInterface $stringConverter |
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*/ |
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public function __construct(LoggerInterface $logger, $loggerLevel = LogLevel::INFO, StringConverterInterface $stringConverter = null) |
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{ |
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$this->logger = $logger; |
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$this->loggerLevel = $loggerLevel; |
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if ($stringConverter) { |
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$this->stringConverter = $stringConverter; |
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} else { |
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$this->stringConverter = new StringConverter(); |
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} |
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} |
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/** |
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* @param StatemachineInterface $stateMachine |
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* |
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* @return array |
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*/ |
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protected function createLoggerContext(StatemachineInterface $stateMachine) |
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{ |
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$context = array(); |
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$context[self::CONTEXT_SUBJECT] = $stateMachine->getSubject(); |
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$context[self::CONTEXT_CURRENT_STATE] = $stateMachine->getCurrentState(); |
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if ($stateMachine instanceof Statemachine) { |
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$context[self::CONTEXT_LAST_STATE] = $stateMachine->getLastState(); |
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$context[self::CONTEXT_TRANSITION] = $stateMachine->getSelectedTransition(); |
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} |
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return $context; |
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} |
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/** |
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* @param array $context |
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* |
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* @return string |
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*/ |
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protected function createLoggerMessage(array $context) |
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{ |
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$message = 'Transition'; |
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if (isset($context[self::CONTEXT_SUBJECT])) { |
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$message .= ' for "' . $this->stringConverter->convertToString($context[self::CONTEXT_SUBJECT]) . '"'; |
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} |
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if (isset($context[self::CONTEXT_LAST_STATE])) { |
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$message .= ' from "' . $this->stringConverter->convertToString($context[self::CONTEXT_LAST_STATE]) . '"'; |
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} |
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if (isset($context[self::CONTEXT_CURRENT_STATE])) { |
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$message .= ' to "' . $this->stringConverter->convertToString($context[self::CONTEXT_CURRENT_STATE]) . '"'; |
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} |
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if (isset($context[self::CONTEXT_TRANSITION])) { |
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/* @var $transition TransitionInterface */ |
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$transition = $context[self::CONTEXT_TRANSITION]; |
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$eventName = $transition->getEventName(); |
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$condition = $transition->getConditionName(); |
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if ($eventName || $condition) { |
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$message .= ' with'; |
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if ($eventName) { |
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$message .= ' event "' . $eventName . '"'; |
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} |
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if ($eventName) { |
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$message .= ' condition "' . $condition . '"'; |
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} |
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} |
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} |
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return $message; |
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} |
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/** |
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* @see SplObserver::update() |
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*/ |
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public function update(\SplSubject $stateMachine) |
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{ |
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if ($stateMachine instanceof StatemachineInterface) { |
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$context = $this->createLoggerContext($stateMachine); |
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$message = $this->createLoggerMessage($context); |
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$this->logger->log($this->loggerLevel, $message, $context); |
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} |
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} |
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} |
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Metabor /
Statemachine
