queue_unique
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Did you ever want a queue that only accepts unique items? This module provides a way of doing that. If you try to insert a duplicated item in the queue, the item is ignored.
// $data can be anything.
$data = ['Lorem', 'ipsum'];
$queue_name = 'your_queue_name';
$queue = \Drupal::service('queue')->get($queue_name);
$queue->createItem($data);
// This will insert a duplicate, and will return FALSE.
if ($queue->createItem($data) === FALSE) {
// The item was a duplicate, respond appropriately.
}
Usage
In order for your queue to use the Queue Unique you need to update your settings.php file:
$settings['queue_service_your_queue_name'] = 'queue_unique.database';