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<?php |
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/* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* The software is based on the Axon Framework project which is |
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* licensed under the Apache 2.0 license. For more information on the Axon Framework |
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* see <http://www.axonframework.org/>. |
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* |
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* This software consists of voluntary contributions made by many individuals |
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* and is licensed under the MIT license. For more information, see |
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* <http://www.governor-framework.org/>. |
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*/ |
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namespace Governor\Framework\CommandHandling\Distributed; |
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use Governor\Framework\CommandHandling\NoHandlerForCommandException; |
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use Governor\Framework\Serializer\MessageSerializer; |
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use Governor\Framework\CommandHandling\CommandBusInterface; |
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use Governor\Framework\Serializer\SerializerInterface; |
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use Governor\Framework\CommandHandling\CommandCallbackInterface; |
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use Governor\Framework\CommandHandling\CommandHandlerInterface; |
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use Governor\Framework\CommandHandling\CommandMessageInterface; |
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class RedisCommandBusConnector implements CommandBusConnectorInterface |
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{ |
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/** |
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* @var RedisTemplate |
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*/ |
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private $template; |
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/** |
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* @var CommandBusInterface |
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*/ |
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private $localSegment; |
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/** |
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* @var MessageSerializer |
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*/ |
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private $serializer; |
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/** |
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* @param RedisTemplate $template |
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* @param CommandBusInterface $localSegment |
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* @param SerializerInterface $serializer |
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*/ |
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function __construct(RedisTemplate $template, CommandBusInterface $localSegment, SerializerInterface $serializer) |
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{ |
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$this->template = $template; |
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$this->localSegment = $localSegment; |
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$this->serializer = new MessageSerializer($serializer); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function send($routingKey, CommandMessageInterface $command, CommandCallbackInterface $callback = null) |
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{ |
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$destination = $this->template->getRoutingDestination($command->getCommandName(), $routingKey); |
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if (null === $destination) { |
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$destination = $this->findSuitableNode($command); |
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$this->template->setRoutingDestination($destination, $command->getCommandName(), $routingKey); |
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} |
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// dispatch locally if destination matches this node |
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if ($this->template->getNodeName() === $destination) { |
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$this->localSegment->dispatch($command, $callback); |
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return; |
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} |
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$awaitReply = $callback ? true : false; |
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$dispatchMessage = new DispatchMessage($command, $this->serializer, $awaitReply); |
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$this->template->enqueueCommand($destination, $dispatchMessage->toBytes()); |
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if ($awaitReply) { |
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$reply = $this->template->readCommandReply($command->getIdentifier()); |
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if (null === $reply) { |
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$callback->onFailure(new CommandTimeoutException($command->getIdentifier())); |
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return; |
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} |
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$replyMessage = ReplyMessage::fromBytes($this->serializer, $reply[1]); |
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if ($replyMessage->isSuccess()) { |
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$callback->onSuccess($replyMessage->getReturnValue()); |
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} else { |
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$callback->onFailure(new CommandDispatchException($replyMessage->getError())); |
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} |
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} |
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} |
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private function findSuitableNode(CommandMessageInterface $command) |
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{ |
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$nodes = $this->template->getSubscriptions($command->getCommandName()); |
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if (empty($nodes)) { |
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throw new NoHandlerForCommandException( |
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sprintf( |
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"No handler in cluster was subscribed for command [%s]", |
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$command->getCommandName() |
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) |
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); |
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} |
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return $nodes[0]; // TODO temporary something more elaborate :) |
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} |
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/** |
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* Subscribe the given <code>handler</code> to commands of type <code>commandType</code> to the local segment of the |
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* command bus. |
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* <p/> |
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* If a subscription already exists for the given type, the behavior is undefined. Implementations may throw an |
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* Exception to refuse duplicate subscription or alternatively decide whether the existing or new |
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* <code>handler</code> gets the subscription. |
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* |
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* @param string $commandName The name of the command to subscribe the handler to |
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* @param CommandHandlerInterface $handler The handler instance that handles the given type of command |
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*/ |
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public function subscribe($commandName, CommandHandlerInterface $handler) |
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{ |
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$this->localSegment->subscribe($commandName, $handler); |
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} |
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/** |
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* Unsubscribe the given <code>handler</code> to commands of type <code>commandType</code>. If the handler is not |
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* currently assigned to that type of command, no action is taken. |
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* |
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* @param string $commandName The name of the command the handler is subscribed to |
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* @param CommandHandlerInterface $handler The handler instance to unsubscribe from the CommandBus |
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*/ |
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public function unsubscribe($commandName, CommandHandlerInterface $handler) |
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{ |
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$this->localSegment->unsubscribe($commandName, $handler); |
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} |
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/** |
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* |
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*/ |
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1 |
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public function saveSubscriptions() |
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{ |
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foreach ($this->localSegment->getSubscriptions() as $command => $handler) { |
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$this->template->subscribe($command); |
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} |
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} |
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/** |
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* |
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*/ |
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public function clearSubscriptions() |
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{ |
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foreach ($this->localSegment->getSubscriptions() as $command => $handler) { |
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$this->template->unsubscribe($command); |
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} |
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} |
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/** |
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* @return string |
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*/ |
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public function getNodeName() |
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{ |
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return $this->template->getNodeName(); |
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} |
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} |
SmartGecko /
GovernorFramework
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