View file File name : ActionScheduler_Lock.php Content :<?php /** * Abstract class for setting a basic lock to throttle some action. * * Class ActionScheduler_Lock */ abstract class ActionScheduler_Lock { /** @var ActionScheduler_Lock */ private static $locker = NULL; /** @var int */ protected static $lock_duration = MINUTE_IN_SECONDS; /** * Check if a lock is set for a given lock type. * * @param string $lock_type A string to identify different lock types. * @return bool */ public function is_locked( $lock_type ) { return ( $this->get_expiration( $lock_type ) >= time() ); } /** * Set a lock. * * To prevent race conditions, implementations should avoid setting the lock if the lock is already held. * * @param string $lock_type A string to identify different lock types. * @return bool */ abstract public function set( $lock_type ); /** * If a lock is set, return the timestamp it was set to expiry. * * @param string $lock_type A string to identify different lock types. * @return bool|int False if no lock is set, otherwise the timestamp for when the lock is set to expire. */ abstract public function get_expiration( $lock_type ); /** * Get the amount of time to set for a given lock. 60 seconds by default. * * @param string $lock_type A string to identify different lock types. * @return int */ protected function get_duration( $lock_type ) { return apply_filters( 'action_scheduler_lock_duration', self::$lock_duration, $lock_type ); } /** * @return ActionScheduler_Lock */ public static function instance() { if ( empty( self::$locker ) ) { $class = apply_filters( 'action_scheduler_lock_class', 'ActionScheduler_OptionLock' ); self::$locker = new $class(); } return self::$locker; } }