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<?php

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/**

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* @package Freemius

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* @license https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3

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* @since 2.5.1

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if ( ! defined( 'ABSPATH' ) ) {

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exit;

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}

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/**

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* Class FS_Lock

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* @author Vova Feldman (@svovaf)

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* @since 2.5.1

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class FS_Lock {

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/**

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* @var int Random ID representing the current PHP thread.

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private static $_thread_id;

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/**

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* @var string

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private $_lock_id;

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/**

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* @param string $lock_id

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function __construct( $lock_id ) {

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if ( ! fs_starts_with( $lock_id, WP_FS___OPTION_PREFIX ) ) {

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$lock_id = WP_FS___OPTION_PREFIX . $lock_id;

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}

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$this->_lock_id = $lock_id;

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if ( ! isset( self::$_thread_id ) ) {

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self::$_thread_id = mt_rand( 0, 32000 );

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}

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}

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/**

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* Try to acquire lock. If the lock is already set or is being acquired by another locker, don't do anything.

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* @param int $expiration

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* @return bool TRUE if successfully acquired lock.

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function try_lock( $expiration = 0 ) {

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if ( $this->is_locked() ) {

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// Already locked.

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return false;

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}

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set_site_transient( $this->_lock_id, self::$_thread_id, $expiration );

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if ( $this->has_lock() ) {

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$this->lock($expiration);

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return true;

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}

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return false;

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}

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/**

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* Acquire lock regardless if it's already acquired by another locker or not.

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* @author Vova Feldman (@svovaf)

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* @since 2.1.0

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* @param int $expiration

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function lock( $expiration = 0 ) {

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set_site_transient( $this->_lock_id, true, $expiration );

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}

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/**

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* Checks if lock is currently acquired.

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* @author Vova Feldman (@svovaf)

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* @since 2.1.0

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* @return bool

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function is_locked() {

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return ( false !== get_site_transient( $this->_lock_id ) );

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}

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/**

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* Unlock the lock.

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* @author Vova Feldman (@svovaf)

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* @since 2.1.0

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function unlock() {

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delete_site_transient( $this->_lock_id );

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}

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/**

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* Checks if lock is currently acquired by the current locker.

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* @return bool

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protected function has_lock() {

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return ( self::$_thread_id == get_site_transient( $this->_lock_id ) );

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}

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}

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