class BatchMemory in Drupal 8

Defines a batch queue handler used by the Batch API for non-progressive batches.

This implementation:

• Ensures FIFO ordering.
• Allows an item to be repeatedly claimed until it is actually deleted (no notion of lease time or 'expire' date), to allow multipass operations.

Hierarchy

• class \Drupal\Core\Queue\Memory implements QueueInterface
  • class \Drupal\Core\Queue\BatchMemory

Related topics

Queue operations

Queue items to allow later processing.

File

core/lib/Drupal/Core/Queue/BatchMemory.php, line 16

Namespace

Drupal\Core\Queue

class BatchMemory extends Memory {

  /**
   * Overrides \Drupal\Core\Queue\Memory::claimItem().
   *
   * Unlike \Drupal\Core\Queue\Memory::claimItem(), this method provides a
   * default lease time of 0 (no expiration) instead of 30. This allows the item
   * to be claimed repeatedly until it is deleted.
   */
  public function claimItem($lease_time = 0) {
    if (!empty($this->queue)) {
      reset($this->queue);
      return current($this->queue);
    }
    return FALSE;
  }

  /**
   * Retrieves all remaining items in the queue.
   *
   * This is specific to Batch API and is not part of the
   * \Drupal\Core\Queue\QueueInterface.
   *
   * @return array
   *   An array of queue items.
   */
  public function getAllItems() {
    $result = [];
    foreach ($this->queue as $item) {
      $result[] = $item->data;
    }
    return $result;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
BatchMemory::claimItem	public	function	Overrides \Drupal\Core\Queue\Memory::claimItem(). Overrides Memory::claimItem
BatchMemory::getAllItems	public	function	Retrieves all remaining items in the queue.
Memory::$idSequence	protected	property	Counter for item ids.
Memory::$queue	protected	property	The queue data.
Memory::createItem	public	function	Adds a queue item and store it directly to the queue. Overrides QueueInterface::createItem
Memory::createQueue	public	function	Creates a queue. Overrides QueueInterface::createQueue
Memory::deleteItem	public	function	Deletes a finished item from the queue. Overrides QueueInterface::deleteItem
Memory::deleteQueue	public	function	Deletes a queue and every item in the queue. Overrides QueueInterface::deleteQueue
Memory::numberOfItems	public	function	Retrieves the number of items in the queue. Overrides QueueInterface::numberOfItems
Memory::releaseItem	public	function	Releases an item that the worker could not process. Overrides QueueInterface::releaseItem
Memory::__construct	public	function	Constructs a Memory object.