MemoryQueue : Is totaly in memory queue system.

SystemQueue : Is the default Drupal Queue whaich is backed by MySql, what actually happen here is you handover something to queue drupal wrap it with some metadata and save it to queue table To permanently delete an item from the Queue use deleteQueue() which means finally removing it from the queue.ĭrupal Cron system uses Queue very heavily. releaseItem() release an item for others to get hold on it, which means giving up a claim but leaving the item in the queue. claimItem($seconds) helps to read item from the Queue, there could be number of users claiming stuff from the Queue therefore user can mentioned the seconds he want to claim the item, which essentially means requesting the item from the queue and holding a lock on that item for a specified period of time. numberOfItems() method lets you see how many items are present in the queue. Delay Processing of complex calculation so system load in more reliable.Īfter creating a Queue with createQueue() you need to create an Item with createItem($data) which will place your item in a Queue and wrapped it with some meta data such as Id and on retrieving data from Queue we will receive this meta-data as well.Processding of large amounts of data/item.To simplify our development by dealing with single items instead of huge catalog.So why we would be using Drupal Queue Api, its simple to The Queue API is designed to manage tasks exactly like the way we make to-do lists for day-to-today life in Drupal term we call data processing, chore Queue always have room for one more the exception is if you ran out of memory or you ran out of storage space. I always found an option appear in list after enabling the module Enqueue the operation instead of executing it directly, this make me appealing to learn more about Drupal Queue API and Batch processing. I have been using Views Bulk Operations (VBO) module from long time.

Drupal queue api