| 1441 |
ariadna |
1 |
<?php
|
|
|
2 |
// This file is part of Moodle - http://moodle.org/
|
|
|
3 |
//
|
|
|
4 |
// Moodle is free software: you can redistribute it and/or modify
|
|
|
5 |
// it under the terms of the GNU General Public License as published by
|
|
|
6 |
// the Free Software Foundation, either version 3 of the License, or
|
|
|
7 |
// (at your option) any later version.
|
|
|
8 |
//
|
|
|
9 |
// Moodle is distributed in the hope that it will be useful,
|
|
|
10 |
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
11 |
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
12 |
// GNU General Public License for more details.
|
|
|
13 |
//
|
|
|
14 |
// You should have received a copy of the GNU General Public License
|
|
|
15 |
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
|
|
|
16 |
|
|
|
17 |
namespace core_cache;
|
|
|
18 |
|
|
|
19 |
/**
|
|
|
20 |
* A wrapper class used to handle ttl when the cache store doesn't natively support it.
|
|
|
21 |
*
|
|
|
22 |
* This class is exactly why you should use event driving invalidation of cache data rather than relying on ttl.
|
|
|
23 |
*
|
|
|
24 |
* @package core_cache
|
|
|
25 |
* @category cache
|
|
|
26 |
* @copyright 2012 Sam Hemelryk
|
|
|
27 |
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
|
28 |
*/
|
|
|
29 |
class ttl_wrapper {
|
|
|
30 |
/**
|
|
|
31 |
* The data being stored.
|
|
|
32 |
* @var mixed
|
|
|
33 |
*/
|
|
|
34 |
public $data;
|
|
|
35 |
|
|
|
36 |
/**
|
|
|
37 |
* When the cache data expires as a timestamp.
|
|
|
38 |
* @var int
|
|
|
39 |
*/
|
|
|
40 |
public $expires;
|
|
|
41 |
|
|
|
42 |
/**
|
|
|
43 |
* Constructs a ttl cache wrapper.
|
|
|
44 |
*
|
|
|
45 |
* @param mixed $data
|
|
|
46 |
* @param int $ttl The time to live in seconds.
|
|
|
47 |
*/
|
|
|
48 |
public function __construct($data, $ttl) {
|
|
|
49 |
$this->data = $data;
|
|
|
50 |
$this->expires = cache::now() + (int)$ttl;
|
|
|
51 |
}
|
|
|
52 |
|
|
|
53 |
/**
|
|
|
54 |
* Returns true if the data has expired.
|
|
|
55 |
* @return int
|
|
|
56 |
*/
|
|
|
57 |
public function has_expired() {
|
|
|
58 |
return ($this->expires < cache::now());
|
|
|
59 |
}
|
|
|
60 |
}
|
|
|
61 |
|
|
|
62 |
// Alias this class to the old name.
|
|
|
63 |
// This file will be autoloaded by the legacyclasses autoload system.
|
|
|
64 |
// In future all uses of this class will be corrected and the legacy references will be removed.
|
|
|
65 |
class_alias(ttl_wrapper::class, \cache_ttl_wrapper::class);
|