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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\MessageQueue;
use Magento\Framework\App\ResourceConnection;
/**
* Processes any type of messages except messages implementing MergedMessageInterface.
*/
class MessageProcessor implements MessageProcessorInterface
{
/**
* Maximum number of transaction retries
*/
const MAX_TRANSACTION_RETRIES = 10;
/**
* @var \Magento\Framework\MessageQueue\MessageStatusProcessor
*/
private $messageStatusProcessor;
/**
* @var \Magento\Framework\App\ResourceConnection
*/
private $resource;
/**
* @var int
*/
private $retryCount = 0;
/**
* @param MessageStatusProcessor $messageStatusProcessor
* @param ResourceConnection $resource
*/
public function __construct(
MessageStatusProcessor $messageStatusProcessor,
ResourceConnection $resource
) {
$this->messageStatusProcessor = $messageStatusProcessor;
$this->resource = $resource;
}
/**
* @inheritdoc
*/
public function process(
QueueInterface $queue,
ConsumerConfigurationInterface $configuration,
array $messages,
array $messagesToAcknowledge,
array $mergedMessages
) {
try {
$this->resource->getConnection()->beginTransaction();
$this->messageStatusProcessor->acknowledgeMessages($queue, $messagesToAcknowledge);
$this->dispatchMessages($configuration, $mergedMessages);
$this->resource->getConnection()->commit();
$this->messageStatusProcessor->acknowledgeMessages($queue, $messages);
} catch (ConnectionLostException $e) {
$this->resource->getConnection()->rollBack();
} catch (\Exception $e) {
$retry = false;
$this->resource->getConnection()->rollBack();
if (strpos($e->getMessage(), 'Error while sending QUERY packet') !== false
&& $this->retryCount < self::MAX_TRANSACTION_RETRIES
) {
$retry = true;
$this->retryCount++;
$this->resource->closeConnection();
$this->process($queue, $configuration, $messages, $messagesToAcknowledge, $mergedMessages);
}
if (!$retry) {
$this->messageStatusProcessor->rejectMessages($queue, $messages);
}
}
}
/**
* Processes decoded messages, invokes callbacks, changes statuses for messages.
*
* @param ConsumerConfigurationInterface $configuration
* @param array $messageList
*/
private function dispatchMessages(ConsumerConfigurationInterface $configuration, array $messageList)
{
foreach ($messageList as $topicName => $messages) {
foreach ($messages as $message) {
$callbacks = $configuration->getHandlers($topicName);
foreach ($callbacks as $callback) {
call_user_func($callback, $message);
}
}
}
}
}