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<?php |
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/* |
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* Copyright (c) 2012-2014 Janos Szurovecz |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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* of the Software, and to permit persons to whom the Software is furnished to do |
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* so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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namespace predaddy\commandhandling; |
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use ArrayObject; |
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use Exception; |
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use precore\lang\ObjectClass; |
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use precore\util\Preconditions; |
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use predaddy\domain\GenericAggregateId; |
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use predaddy\domain\Repository; |
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use predaddy\domain\StateHashAware; |
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use predaddy\messagehandling\ClosureWrapper; |
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use predaddy\messagehandling\MessageHandlerDescriptorFactory; |
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use predaddy\messagehandling\util\SimpleMessageCallback; |
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/** |
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* This class acts as a {@link CommandBus} expect one case. If the posted command is a {@link DirectCommand} |
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* and there is no registered handler which could process that, it will load the appropriate AR from the given |
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* repository and passes the command to that. This bus should be used if business method parameters |
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* in the aggregates are {@link Command} objects. |
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* |
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* If you have specialized repositories for your aggregates, it is recommended to use {@link RepositoryDelegate}. |
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* |
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* @author Janos Szurovecz <[email protected]> |
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*/ |
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class DirectCommandBus extends CommandBus |
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{ |
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/** |
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* @var Repository |
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*/ |
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private $repository; |
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/** |
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* @var MessageHandlerDescriptorFactory |
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*/ |
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private $handlerDescriptorFactory; |
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/** |
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* @param DirectCommandBusBuilder $builder |
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*/ |
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public function __construct(DirectCommandBusBuilder $builder) |
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{ |
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parent::__construct($builder); |
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$this->repository = $builder->getRepository(); |
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$this->handlerDescriptorFactory = $builder->getHandlerDescriptorFactory(); |
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} |
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/** |
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* The given repository cannot be null, the default value is due to PHP restrictions. |
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* |
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* @param Repository $repository Is being passed to the registered DirectCommandForwarder |
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* @return DirectCommandBusBuilder |
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*/ |
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public static function builder(Repository $repository = null) |
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{ |
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return new DirectCommandBusBuilder(Preconditions::checkNotNull($repository)); |
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} |
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protected function callableWrappersFor($message) |
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{ |
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$wrappers = parent::callableWrappersFor($message); |
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if (($message instanceof DirectCommand) && $wrappers->count() === 0) { |
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$wrappers = new ArrayObject([new ClosureWrapper( |
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function (DirectCommand $command) { |
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return $this->forwardCommand($command); |
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} |
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)]); |
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} |
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return $wrappers; |
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} |
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/** |
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* @param DirectCommand $command |
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* @throws \Exception If the handler throws any |
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* @return mixed The return value of the last handler (should be one handler per aggregate) |
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*/ |
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private function forwardCommand(DirectCommand $command) |
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{ |
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$aggregateClass = $command->aggregateClass(); |
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$aggregateId = $command->aggregateId(); |
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if ($aggregateId === null) { |
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$aggregate = ObjectClass::forName($aggregateClass)->newInstanceWithoutConstructor(); |
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self::getLogger()->debug('New aggregate [{}] has been created', [$aggregateClass]); |
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} else { |
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$aggregate = $this->repository->load(new GenericAggregateId($aggregateId, $aggregateClass)); |
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self::getLogger()->debug( |
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'Aggregate [{}] with ID [{}] has been successfully loaded', |
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[$aggregateClass, $aggregateId] |
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); |
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if ($command instanceof StateHashAware) { |
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$aggregate->failWhenStateHashViolation($command->stateHash()); |
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} |
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} |
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$forwarderBus = CommandBus::builder() |
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->withIdentifier($aggregateClass) |
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->withHandlerDescriptorFactory($this->handlerDescriptorFactory) |
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->build(); |
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$forwarderBus->register($aggregate); |
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$callback = new SimpleMessageCallback(); |
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$forwarderBus->post($command, $callback); |
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$thrownException = $callback->getException(); |
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if ($thrownException instanceof Exception) { |
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self::getLogger()->debug('Error occurred when command has been applied [{}]', [$command], $thrownException); |
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throw $thrownException; |
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} |
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$this->repository->save($aggregate); |
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self::getLogger()->info("Command [{}] has been applied", [$command]); |
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return $callback->getResult(); |
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} |
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} |
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szjani /
predaddy
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