class-fs-user-lock.php — Code Manager 1.0.3

code-manager / freemius / includes / class-fs-user-lock.php

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class-fs-user-lock.php

126 lines

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 2.1.0
7	*/
8
9	if ( ! defined( 'ABSPATH' ) ) {
10	exit;
11	}
12
13	/**
14	* Class FS_User_Lock
15	*/
16	class FS_User_Lock {
17	/**
18	* @var int
19	*/
20	private $_wp_user_id;
21	/**
22	* @var int
23	*/
24	private $_thread_id;
25
26	#--------------------------------------------------------------------------------
27	#region Singleton
28	#--------------------------------------------------------------------------------
29
30	/**
31	* @var FS_User_Lock
32	*/
33	private static $_instance;
34
35	/**
36	* @author Vova Feldman (@svovaf)
37	* @since 2.1.0
38	*
39	* @return FS_User_Lock
40	*/
41	static function instance() {
42	if ( ! isset( self::$_instance ) ) {
43	self::$_instance = new self();
44	}
45
46	return self::$_instance;
47	}
48
49	#endregion
50
51	private function __construct() {
52	$this->_wp_user_id = Freemius::get_current_wp_user_id();
53	$this->_thread_id = mt_rand( 0, 32000 );
54	}
55
56
57	/**
58	* Try to acquire lock. If the lock is already set or is being acquired by another locker, don't do anything.
59	*
60	* @author Vova Feldman (@svovaf)
61	* @since 2.1.0
62	*
63	* @param int $expiration
64	*
65	* @return bool TRUE if successfully acquired lock.
66	*/
67	function try_lock( $expiration = 0 ) {
68	if ( $this->is_locked() ) {
69	// Already locked.
70	return false;
71	}
72
73	set_site_transient( "locked_{$this->_wp_user_id}", $this->_thread_id, $expiration );
74
75	if ( $this->has_lock() ) {
76	set_site_transient( "locked_{$this->_wp_user_id}", true, $expiration );
77
78	return true;
79	}
80
81	return false;
82	}
83
84	/**
85	* Acquire lock regardless if it's already acquired by another locker or not.
86	*
87	* @author Vova Feldman (@svovaf)
88	* @since 2.1.0
89	*
90	* @param int $expiration
91	*/
92	function lock( $expiration = 0 ) {
93	set_site_transient( "locked_{$this->_wp_user_id}", true, $expiration );
94	}
95
96	/**
97	* Checks if lock is currently acquired.
98	*
99	* @author Vova Feldman (@svovaf)
100	* @since 2.1.0
101	*
102	* @return bool
103	*/
104	function is_locked() {
105	return ( false !== get_site_transient( "locked_{$this->_wp_user_id}" ) );
106	}
107
108	/**
109	* Unlock the lock.
110	*
111	* @author Vova Feldman (@svovaf)
112	* @since 2.1.0
113	*/
114	function unlock() {
115	delete_site_transient( "locked_{$this->_wp_user_id}" );
116	}
117
118	/**
119	* Checks if lock is currently acquired by the current locker.
120	*
121	* @return bool
122	*/
123	private function has_lock() {
124	return ( $this->_thread_id == get_site_transient( "locked_{$this->_wp_user_id}" ) );
125	}
126	}