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<?php |
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namespace PSB\Core\Transport\RabbitMq; |
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class RoutingTopology |
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{ |
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/** |
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* @var bool |
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*/ |
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private $useDurableMessaging; |
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/** |
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* @var bool[] |
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*/ |
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private $messageTopologyConfigured = []; |
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/** |
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* @param bool $useDurableMesaging |
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*/ |
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public function __construct($useDurableMesaging) |
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{ |
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$this->useDurableMessaging = $useDurableMesaging; |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $queueName |
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*/ |
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public function setupForEndpointUse(BrokerModel $broker, $queueName) |
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{ |
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$safeQueueName = static::getSafeName($queueName); |
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$broker->declareQueue($safeQueueName, $this->useDurableMessaging ? AMQP_DURABLE : null); |
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$this->declareExchange($broker, $safeQueueName); |
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$broker->bindQueue($safeQueueName, $safeQueueName, ''); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $messageFqcn |
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* @param string $subscriberName |
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*/ |
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public function setupSubscription(BrokerModel $broker, $messageFqcn, $subscriberName) |
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{ |
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$this->setupClassSubscriptions($broker, $messageFqcn); |
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$broker->bindExchange($subscriberName, $this->getEventExchangeName($messageFqcn)); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $messageFqcn |
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* @param string $subscriberName |
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*/ |
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public function tearDownSubscription(BrokerModel $broker, $messageFqcn, $subscriberName) |
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{ |
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$broker->unbindExchange($subscriberName, $this->getEventExchangeName($messageFqcn)); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $messageFqcn |
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* @param string $messageBody |
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* @param array $attributes |
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*/ |
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public function publish( |
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BrokerModel $broker, |
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$messageFqcn, |
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$messageBody, |
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array $attributes = [] |
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) { |
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// The semantics of publish implies that one can publish without caring who listens, |
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// which means that it should not throw due to lack of exchange(s) and thus we make sure the exchange(s) exists |
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$this->setupClassSubscriptions($broker, $messageFqcn); |
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$broker->publish( |
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$this->getEventExchangeName($messageFqcn), |
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$messageBody, |
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'', |
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AMQP_NOPARAM, |
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$this->enhanceDeliveryMode($attributes) |
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); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $address |
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* @param string $messageBody |
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* @param array $attributes |
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*/ |
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public function send( |
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BrokerModel $broker, |
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$address, |
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$messageBody, |
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array $attributes = [] |
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) { |
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$broker->publish( |
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static::getSafeName($address), |
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$messageBody, |
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'', |
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AMQP_NOPARAM, |
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$this->enhanceDeliveryMode($attributes) |
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); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $queueName |
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* @param string $messageBody |
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* @param array $attributes |
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*/ |
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public function sendToQueue( |
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BrokerModel $broker, |
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$queueName, |
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$messageBody, |
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array $attributes = [] |
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) { |
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$broker->publish( |
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'', |
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$messageBody, |
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static::getSafeName($queueName), |
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AMQP_NOPARAM, |
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$this->enhanceDeliveryMode($attributes) |
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); |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $messageFqcn |
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*/ |
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private function setupClassSubscriptions(BrokerModel $broker, $messageFqcn) |
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{ |
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if ($this->isMessageConfigured($messageFqcn)) { |
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return; |
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} |
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$this->declareExchange($broker, $this->getEventExchangeName($messageFqcn)); |
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foreach (class_implements($messageFqcn, true) as $fqin) { |
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$this->declareExchange($broker, $this->getEventExchangeName($fqin)); |
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$broker->bindExchange($this->getEventExchangeName($fqin), $this->getEventExchangeName($messageFqcn)); |
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} |
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$this->markMessageAsConfigured($messageFqcn); |
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} |
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/** |
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* @param string $messageFqcn |
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*/ |
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private function markMessageAsConfigured($messageFqcn) |
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{ |
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$this->messageTopologyConfigured[$messageFqcn] = null; |
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} |
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/** |
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* @param string $messageFqcn |
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* |
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* @return bool |
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*/ |
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private function isMessageConfigured($messageFqcn) |
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{ |
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return isset($this->messageTopologyConfigured[$messageFqcn]); |
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} |
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/** |
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* Converts a FQCN to a exchange name. |
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* Eg. \Some\Namespaced\Class -> Some.Namespaced:Class |
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* |
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* @param string $messageFqcn |
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* |
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* @return string |
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*/ |
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private function getEventExchangeName($messageFqcn) |
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{ |
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$messageFqcn = trim($messageFqcn, '\\'); |
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$pos = strrpos($messageFqcn, '\\'); |
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if ($pos !== false) { |
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$messageFqcn = substr_replace($messageFqcn, ':', $pos, 1); |
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} |
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return str_replace('\\', '.', $messageFqcn); |
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} |
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/** |
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* Only letters, digits, hyphen, underscore, period or colon are allowed for queue and exchange names in RMQ |
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* |
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* @param string $address |
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* |
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* @return string |
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*/ |
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public static function getSafeName($address) |
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{ |
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return preg_replace("/[^a-zA-Z0-9-_.:]/i", '.', $address); |
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} |
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/** |
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* @param array $attributes |
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* |
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* @return array |
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*/ |
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private function enhanceDeliveryMode(array $attributes) |
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{ |
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$attributes['delivery_mode'] = 1; |
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if ($this->useDurableMessaging) { |
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$attributes['delivery_mode'] = 2; |
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} |
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return $attributes; |
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} |
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/** |
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* @param BrokerModel $broker |
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* @param string $exchangeName |
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*/ |
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private function declareExchange(BrokerModel $broker, $exchangeName) |
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{ |
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$broker->declareExchange($exchangeName, AMQP_EX_TYPE_FANOUT, $this->useDurableMessaging ? AMQP_DURABLE : null); |
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} |
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} |
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