Introduction to cron queue
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This document discusses using cron queues in Drupal. Cron queues allow running long or recurring tasks asynchronously by adding items to a queue and processing them via cron. Key aspects covered include: - Adding items to a queue programmatically or via hooks and processing them via cron hooks or a queue worker callback - Modules that can be used to run cron queues like Ultimate Cron and Elysia Cron - Methods provided by the DrupalQueueInterface like createItem, claimItem, and releaseItem - Benefits of cron queues like decoupling tasks from cron runs and allowing only one job to run at a time
![How To. Add Queue Items
/**
* Implements hook_cronapi().
*/
function mymodule_queue_cronapi($op, $job = NULL) {
$items = array();
$items['add_queue_items'] = array(
'rule' => '0 5 * * *',
'arguments' => array(),
API
'callback' => 'add_queue_items_callback',
);
● Elysia Cron
return $items;
}](https://image.slidesharecdn.com/introductiontocronqueue-141002202556-phpapp01/85/Introduction-to-cron-queue-10-320.jpg)
![How To. Implementation
/**
* Implements hook_cron_queue_info().
*/
function mymodule_cron_queue_info() {
$queues = array();
$queues['queue_name'] = array(
'worker callback' => '_mymodule_queue_worker_callback',
'time' => 90,
'skip on cron' => FALSE,
);
return $queues;
}](https://image.slidesharecdn.com/introductiontocronqueue-141002202556-phpapp01/85/Introduction-to-cron-queue-11-320.jpg)
Introduction to cron queue
- 1. Introduction to Cron Queue Olga Smolyankina
- 2. 300 FOR ALL
- 6. Run methods cron.php Ultimate Cron Elysia Cron .crontab .crontab drush queue-cron modules/drupal_queue_cron.php
- 7. Usage cases ● Entity items creation. ● Sending emails. ● Other mass operations.
- 8. Usage cases
- 9. How To. Add Queue Items $queue = DrupalQueue::get('queue_name'); $queue->createQueue(); $queue->createItem(array( 'key1' => $value1, 'key2' => $value2, ... hook_cron() )); API hook_node_insert($node) hook_user_insert(&$edit, $account, $category) hook_commerce_cart_order_empty($order) ...
- 10. How To. Add Queue Items /** * Implements hook_cronapi(). */ function mymodule_queue_cronapi($op, $job = NULL) { $items = array(); $items['add_queue_items'] = array( 'rule' => '0 5 * * *', 'arguments' => array(), API 'callback' => 'add_queue_items_callback', ); ● Elysia Cron return $items; }
- 11. How To. Implementation /** * Implements hook_cron_queue_info(). */ function mymodule_cron_queue_info() { $queues = array(); $queues['queue_name'] = array( 'worker callback' => '_mymodule_queue_worker_callback', 'time' => 90, 'skip on cron' => FALSE, ); return $queues; }
- 12. How To. Process Queue Items system.queue.inc DrupalQueueInterface::createQueue(); DrupalQueueInterface::deleteQueue(); DrupalQueueInterface::createItem($data); DrupalQueueInterface::claimItem($lease_time = 3600); DrupalQueueInterface::releaseItem($item); DrupalQueueInterface::deleteItem($item); DrupalQueueInterface::numberOfItems();
- 13. Queue Run Tracking ● Queue UI ● Ultimate Cron
- 14. Negatives
- 15. Negatives vs Features ● Cron run frequency. ● Cron run duration. ● Cron run propriety. ● Item locking => single cron job at once. ● Queue decoupled from the code => external queue run!
- 16. Thank you!