silverstripe-fulltextsearch/code/solr/reindex/handlers/SolrReindexMessageHandler.php

<?php

use Psr\Log\LoggerInterface;

if(!class_exists('MessageQueue')) return;

class SolrReindexMessageHandler extends SolrReindexImmediateHandler {
	
	/**
	 * The MessageQueue to use when processing updates
	 * @config
	 * @var string
	 */
	private static $reindex_queue = "search_indexing";

	public function triggerReindex(LoggerInterface $logger, $batchSize, $taskName, $classes = null) {
		$queue = Config::inst()->get(__CLASS__, 'reindex_queue');

		$logger->info('Queuing message');
		MessageQueue::send(
			$queue,
			new MethodInvocationMessage('SolrReindexMessageHandler', 'run_reindex', $batchSize, $taskName, $classes)
		);
	}

	/**
	 * Entry point for message queue
	 *
	 * @param int $batchSize
	 * @param string $taskName
	 * @param array|string|null $classes
	 */
	public static function run_reindex($batchSize, $taskName, $classes = null) {
		// @todo Logger for message queue?
		$logger = Injector::inst()->createWithArgs('Monolog\Logger', array(strtolower(get_class())));
		
		$inst = Injector::inst()->get(get_class());
		$inst->runReindex($logger, $batchSize, $taskName, $classes);
	}
}