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It will become the responsibility of the calling code to ensure * locks are acquired, checked, and released. * * Prior to Moodle 4,3 this function used to return false if the lock cannot be obtained. It * now always returns true, and throws an exception if the lock cannot be obtained. * * @param string|int $key * @return bool Always returns true (for backwards compatibility) * @throws moodle_exception If the lock cannot be obtained after a timeout */ public function acquire_lock($key); /** * Checks if the cache loader owns the lock for the given key. * * Please note that this happens automatically if the cache definition requires locking. * it is still made a public method so that adhoc caches can use it if they choose. * However this doesn't guarantee consistent access. It will become the responsibility of the calling code to ensure * locks are acquired, checked, and released. * * @param string|int $key * @return bool True if this code has the lock, false if there is a lock but this code doesn't have it, * null if there is no lock. */ public function check_lock_state($key); /** * Releases the lock for the given key. * * Please note that this happens automatically if the cache definition requires locking. * it is still made a public method so that adhoc caches can use it if they choose. * However this doesn't guarantee consistent access. It will become the responsibility of the calling code to ensure * locks are acquired, checked, and released. * * @param string|int $key * @return bool True if the lock has been released, false if there was a problem releasing the lock. */ public function release_lock($key); } // Alias this class to the old name. // This file will be autoloaded by the legacyclasses autoload system. // In future all uses of this class will be corrected and the legacy references will be removed. class_alias(loader_with_locking_interface::class, \cache_loader_with_locking::class);