ResourceCheckerConfigCache.php
3.95 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Config;
use Symfony\Component\Config\Resource\ResourceInterface;
use Symfony\Component\Filesystem\Exception\IOException;
use Symfony\Component\Filesystem\Filesystem;
/**
* ResourceCheckerConfigCache uses instances of ResourceCheckerInterface
* to check whether cached data is still fresh.
*
* @author Matthias Pigulla <mp@webfactory.de>
*/
class ResourceCheckerConfigCache implements ConfigCacheInterface
{
/**
* @var string
*/
private $file;
/**
* @var ResourceCheckerInterface[]
*/
private $resourceCheckers;
/**
* @param string $file The absolute cache path
* @param ResourceCheckerInterface[] $resourceCheckers The ResourceCheckers to use for the freshness check
*/
public function __construct($file, array $resourceCheckers = array())
{
$this->file = $file;
$this->resourceCheckers = $resourceCheckers;
}
/**
* {@inheritdoc}
*/
public function getPath()
{
return $this->file;
}
/**
* Checks if the cache is still fresh.
*
* This implementation will make a decision solely based on the ResourceCheckers
* passed in the constructor.
*
* The first ResourceChecker that supports a given resource is considered authoritative.
* Resources with no matching ResourceChecker will silently be ignored and considered fresh.
*
* @return bool true if the cache is fresh, false otherwise
*/
public function isFresh()
{
if (!is_file($this->file)) {
return false;
}
if (!$this->resourceCheckers) {
return true; // shortcut - if we don't have any checkers we don't need to bother with the meta file at all
}
$metadata = $this->getMetaFile();
if (!is_file($metadata)) {
return true;
}
$time = filemtime($this->file);
$meta = unserialize(file_get_contents($metadata));
foreach ($meta as $resource) {
/* @var ResourceInterface $resource */
foreach ($this->resourceCheckers as $checker) {
if (!$checker->supports($resource)) {
continue; // next checker
}
if ($checker->isFresh($resource, $time)) {
break; // no need to further check this resource
}
return false; // cache is stale
}
// no suitable checker found, ignore this resource
}
return true;
}
/**
* Writes cache.
*
* @param string $content The content to write in the cache
* @param ResourceInterface[] $metadata An array of metadata
*
* @throws \RuntimeException When cache file can't be written
*/
public function write($content, array $metadata = null)
{
$mode = 0666;
$umask = umask();
$filesystem = new Filesystem();
$filesystem->dumpFile($this->file, $content, null);
try {
$filesystem->chmod($this->file, $mode, $umask);
} catch (IOException $e) {
// discard chmod failure (some filesystem may not support it)
}
if (null !== $metadata) {
$filesystem->dumpFile($this->getMetaFile(), serialize($metadata), null);
try {
$filesystem->chmod($this->getMetaFile(), $mode, $umask);
} catch (IOException $e) {
// discard chmod failure (some filesystem may not support it)
}
}
}
/**
* Gets the meta file path.
*
* @return string The meta file path
*/
private function getMetaFile()
{
return $this->file.'.meta';
}
}