streamcast / vendor / freemius / includes / class-fs-lock.php

class-fs-lock.php in StreamCast – bring live radio to your site with a sleek player trunk, at vendor/freemius/includes/class-fs-lock.php

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1	<?php
2	/**
3	* @package Freemius
4	* @copyright Copyright (c) 2015, Freemius, Inc.
5	* @license https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
6	* @since 2.5.1
7	*/
8
9	if ( ! defined( 'ABSPATH' ) ) {
10	exit;
11	}
12
13	/**
14	* Class FS_Lock
15	*
16	* @author Vova Feldman (@svovaf)
17	* @since 2.5.1
18	*/
19	class FS_Lock {
20	/**
21	* @var int Random ID representing the current PHP thread.
22	*/
23	private static $_thread_id;
24	/**
25	* @var string
26	*/
27	private $_lock_id;
28
29	/**
30	* @param string $lock_id
31	*/
32	function __construct( $lock_id ) {
33	if ( ! fs_starts_with( $lock_id, WP_FS___OPTION_PREFIX ) ) {
34	$lock_id = WP_FS___OPTION_PREFIX . $lock_id;
35	}
36
37	$this->_lock_id = $lock_id;
38
39	if ( ! isset( self::$_thread_id ) ) {
40	self::$_thread_id = mt_rand( 0, 32000 );
41	}
42	}
43
44	/**
45	* Try to acquire lock. If the lock is already set or is being acquired by another locker, don't do anything.
46	*
47	* @param int $expiration
48	*
49	* @return bool TRUE if successfully acquired lock.
50	*/
51	function try_lock( $expiration = 0 ) {
52	if ( $this->is_locked() ) {
53	// Already locked.
54	return false;
55	}
56
57	set_site_transient( $this->_lock_id, self::$_thread_id, $expiration );
58
59	if ( $this->has_lock() ) {
60	$this->lock($expiration);
61
62	return true;
63	}
64
65	return false;
66	}
67
68	/**
69	* Acquire lock regardless if it's already acquired by another locker or not.
70	*
71	* @author Vova Feldman (@svovaf)
72	* @since 2.1.0
73	*
74	* @param int $expiration
75	*/
76	function lock( $expiration = 0 ) {
77	set_site_transient( $this->_lock_id, true, $expiration );
78	}
79
80	/**
81	* Checks if lock is currently acquired.
82	*
83	* @author Vova Feldman (@svovaf)
84	* @since 2.1.0
85	*
86	* @return bool
87	*/
88	function is_locked() {
89	return ( false !== get_site_transient( $this->_lock_id ) );
90	}
91
92	/**
93	* Unlock the lock.
94	*
95	* @author Vova Feldman (@svovaf)
96	* @since 2.1.0
97	*/
98	function unlock() {
99	delete_site_transient( $this->_lock_id );
100	}
101
102	/**
103	* Checks if lock is currently acquired by the current locker.
104	*
105	* @return bool
106	*/
107	protected function has_lock() {
108	return ( self::$_thread_id == get_site_transient( $this->_lock_id ) );
109	}
110	}