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<?php |
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namespace PhpDDD\Command\Bus; |
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use Exception; |
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use PhpDDD\Command\CommandInterface; |
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use PhpDDD\Command\Handler\Locator\CommandHandlerLocatorInterface; |
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use PhpDDD\Domain\AbstractAggregateRoot; |
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/** |
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* The sequential command bus works like a stack. |
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* It wait until a command is fully processed to invoke the next one. |
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* Each command will be happened to the tail of the stack before being processed. |
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*/ |
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class SequentialCommandBus implements CommandBusInterface |
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{ |
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/** |
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* @var CommandHandlerLocatorInterface |
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*/ |
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private $locator; |
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/** |
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* @var CommandInterface[] |
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*/ |
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private $commandStack = array(); |
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/** |
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* @var bool |
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*/ |
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private $executing = false; |
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/** |
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* @param CommandHandlerLocatorInterface $locator |
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*/ |
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public function __construct(CommandHandlerLocatorInterface $locator) |
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{ |
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$this->locator = $locator; |
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} |
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/** |
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* Sequentially execute commands |
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* |
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* If an exception occurs in any command it will be put on a stack |
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* of exceptions that is thrown only when all the commands are processed. |
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* |
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* [@inheritdoc} |
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*/ |
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public function dispatch(CommandInterface $command) |
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{ |
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$this->commandStack[] = $command; |
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if ($this->executing) { |
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return array(); |
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} |
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$first = true; |
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$aggregateRoots = array(); |
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while ($command = array_shift($this->commandStack)) { |
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$aggregateRoots[] = $this->invokeHandler($command, $first); |
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$first = false; |
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} |
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return $aggregateRoots; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getRegisteredCommandHandlers() |
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{ |
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return $this->locator->getRegisteredCommandHandlers(); |
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} |
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/** |
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* @param CommandInterface $command |
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* @param bool $first |
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* |
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* @throws Exception |
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* @return AbstractAggregateRoot|null |
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*/ |
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protected function invokeHandler(CommandInterface $command, $first) |
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{ |
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$aggregateRoot = null; |
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try { |
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$this->executing = true; |
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$commandHandler = $this->locator->getCommandHandlerForCommand($command); |
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$aggregateRoot = $commandHandler->handle($command); |
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} catch (Exception $exception) { |
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$this->executing = false; |
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$this->handleException($exception, $first); |
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} |
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$this->executing = false; |
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return $aggregateRoot; |
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} |
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/** |
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* Only throw the exception if this is the first dispatch of the sequential dispatching. |
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* If we have a sub-command that throw an exception, it should not prevent other sub-command to be executed. |
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* We may need to rollback the whole process. |
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* |
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* @param Exception $exception |
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* @param bool $first |
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* |
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* @throws \Exception |
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*/ |
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protected function handleException(Exception $exception, $first) |
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{ |
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if ($first) { |
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throw $exception; |
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} |
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} |
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} |
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php-ddd /
command
