interface LockBackendInterface in Service Container 7.2

Lock backend interface.

Hierarchy

• interface \Drupal\Core\Lock\LockBackendInterface

Related topics

Locking mechanisms

Functions to coordinate long-running operations across requests.

File

lib/Drupal/Core/Lock/LockBackendInterface.php, line 69

Contains \Drupal\Core\Lock\LockBackendInterface.

Namespace

Drupal\Core\Lock

interface LockBackendInterface {

  /**
   * Acquires a lock.
   *
   * @param string $name
   *   Lock name. Limit of name's length is 255 characters.
   * @param float $timeout = 30.0
   *   (optional) Lock lifetime in seconds.
   *
   * @return bool
   */
  public function acquire($name, $timeout = 30.0);

  /**
   * Checks if a lock is available for acquiring.
   *
   * @param string $name
   *   Lock to acquire.
   *
   * @return bool
   */
  public function lockMayBeAvailable($name);

  /**
   * Waits a short amount of time before a second lock acquire attempt.
   *
   * While this method is subject to have a generic implementation in abstract
   * backend implementation, some backends may provide non blocking or less I/O
   * intensive wait mechanism: this is why this method remains on the backend
   * interface.
   *
   * @param string $name
   *   Lock name currently being locked.
   * @param int $delay = 30
   *   Milliseconds to wait for.
   *
   * @return bool
   *   TRUE if the lock holds, FALSE if it may be available. You still need to
   *   acquire the lock manually and it may fail again.
   */
  public function wait($name, $delay = 30);

  /**
   * Releases the given lock.
   *
   * @param string $name
   */
  public function release($name);

  /**
   * Releases all locks for the given lock token identifier.
   *
   * @param string $lockId
   *   (optional) If none given, remove all locks from the current page.
   *   Defaults to NULL.
   */
  public function releaseAll($lockId = NULL);

  /**
   * Gets the unique page token for locks.
   *
   * Locks will be wiped out at the end of each page request on a token basis.
   *
   * @return string
   */
  public function getLockId();

}

Members

Name	Modifiers	Type	Description	Overrides
LockBackendInterface::acquire	public	function	Acquires a lock.	2
LockBackendInterface::getLockId	public	function	Gets the unique page token for locks.	2
LockBackendInterface::lockMayBeAvailable	public	function	Checks if a lock is available for acquiring.	2
LockBackendInterface::release	public	function	Releases the given lock.	2
LockBackendInterface::releaseAll	public	function	Releases all locks for the given lock token identifier.	2
LockBackendInterface::wait	public	function	Waits a short amount of time before a second lock acquire attempt.	2