1 | <?php |
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2 | |||||
3 | declare(strict_types=1); |
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4 | |||||
5 | /* |
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6 | * This file is part of BiuradPHP opensource projects. |
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7 | * |
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8 | * PHP version 7.1 and above required |
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9 | * |
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10 | * @author Divine Niiquaye Ibok <[email protected]> |
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11 | * @copyright 2019 Biurad Group (https://biurad.com/) |
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12 | * @license https://opensource.org/licenses/BSD-3-Clause License |
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13 | * |
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14 | * For the full copyright and license information, please view the LICENSE |
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15 | * file that was distributed with this source code. |
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16 | */ |
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17 | |||||
18 | namespace BiuradPHP\Cache; |
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19 | |||||
20 | use BadMethodCallException; |
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21 | use Closure; |
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22 | use Exception; |
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23 | use Generator; |
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24 | use Psr\Cache\CacheItemInterface; |
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25 | use Psr\Cache\CacheItemPoolInterface; |
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26 | use Psr\SimpleCache\CacheInterface; |
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27 | use stdClass; |
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28 | |||||
29 | class CacheItemPool implements CacheItemPoolInterface |
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30 | { |
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31 | /** |
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32 | * @var CacheInterface |
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33 | */ |
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34 | protected $pool; |
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35 | |||||
36 | /** |
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37 | * @var null|int The maximum length to enforce for identifiers or null when no limit applies |
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38 | */ |
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39 | protected $maxIdLength; |
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40 | |||||
41 | /** |
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42 | * @var Closure needs to be set by class, signature is function(string <key>, mixed <value>, bool <isHit>) |
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43 | */ |
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44 | private $createCacheItem; |
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45 | |||||
46 | /** |
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47 | * @var Closure needs to be set by class, signature is function(array <deferred>, array <&expiredIds>) |
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48 | */ |
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49 | private $mergeByLifetime; |
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50 | |||||
51 | /** @var array<string,CacheItemInterface> */ |
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52 | private $deferred = []; |
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53 | |||||
54 | /** @var array<string,string> */ |
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55 | private $ids = []; |
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56 | |||||
57 | /** @var stdclass */ |
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58 | private $miss; |
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59 | |||||
60 | /** |
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61 | * Cache Constructor. |
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62 | * |
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63 | * @param CacheInterface $psr16 |
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64 | */ |
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65 | public function __construct(CacheInterface $psr16) |
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66 | { |
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67 | $this->pool = $psr16; |
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68 | $this->miss = new stdClass(); |
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69 | |||||
70 | $this->createCacheItem = Closure::bind( |
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71 | static function ($key, $value, $isHit) { |
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72 | $item = new CacheItem(); |
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73 | $item->key = $key; |
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74 | $item->value = $v = $value; |
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75 | $item->isHit = $isHit; |
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76 | $item->defaultLifetime = 0; |
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77 | // Detect wrapped values that encode for their expiry and creation duration |
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78 | // For compactness, these values are packed in the key of an array using |
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79 | // magic numbers in the form 9D-..-..-..-..-00-..-..-..-5F |
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80 | if ( |
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81 | \is_array($v) && |
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82 | 1 === \count($v) && |
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83 | 10 === \strlen($k = (string) \key($v)) && |
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84 | "\x9D" === $k[0] && |
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85 | "\0" === $k[5] && |
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86 | "\x5F" === $k[9] |
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87 | ) { |
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88 | $item->value = $v[$k]; |
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89 | } |
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90 | |||||
91 | return $item; |
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92 | }, |
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93 | null, |
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94 | CacheItem::class |
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95 | ); |
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96 | $getId = Closure::fromCallable([$this, 'getId']); |
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97 | $this->mergeByLifetime = Closure::bind( |
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98 | static function ($deferred, &$expiredIds) use ($getId) { |
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99 | $byLifetime = []; |
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100 | $now = \microtime(true); |
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101 | $expiredIds = []; |
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102 | |||||
103 | foreach ($deferred as $key => $item) { |
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104 | $key = (string) $key; |
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105 | |||||
106 | if (null === $item->expiry) { |
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107 | $ttl = 0 < $item->defaultLifetime ? $item->defaultLifetime : 0; |
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108 | } elseif (0 >= $ttl = (int) (0.1 + $item->expiry - $now)) { |
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109 | $expiredIds[] = $getId($key); |
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110 | |||||
111 | continue; |
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112 | } |
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113 | |||||
114 | // For compactness, expiry and creation duration are packed in the key of an array, |
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115 | // using magic numbers as separators |
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116 | $byLifetime[$ttl][$getId($key)] = $item->value; |
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117 | } |
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118 | |||||
119 | return $byLifetime; |
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120 | }, |
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121 | null, |
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122 | CacheItem::class |
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123 | ); |
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124 | } |
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125 | |||||
126 | public function __destruct() |
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127 | { |
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128 | if (\count($this->deferred) > 0) { |
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129 | $this->commit(); |
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130 | } |
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131 | } |
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132 | |||||
133 | public function __sleep(): void |
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134 | { |
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135 | throw new BadMethodCallException('Cannot serialize ' . __CLASS__); |
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136 | } |
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137 | |||||
138 | public function __wakeup(): void |
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139 | { |
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140 | throw new BadMethodCallException('Cannot unserialize ' . __CLASS__); |
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141 | } |
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142 | |||||
143 | /** |
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144 | * {@inheritdoc} |
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145 | */ |
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146 | public function getItem($key) |
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147 | { |
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148 | if (\count($this->deferred) > 0) { |
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149 | $this->commit(); |
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150 | } |
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151 | |||||
152 | $id = $this->getId($key); |
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153 | $f = $this->createCacheItem; |
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154 | $isHit = false; |
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155 | $value = null; |
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156 | |||||
157 | try { |
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158 | foreach ($this->doFetch([$id]) as $value) { |
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159 | $isHit = true; |
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160 | } |
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161 | |||||
162 | return $f($key, $value, $isHit); |
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163 | } catch (Exception $e) { |
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164 | return $f($key, null, false); |
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165 | } |
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166 | } |
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167 | |||||
168 | /** |
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169 | * {@inheritdoc} |
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170 | * |
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171 | * @return iterable<string,CacheItemInterface> |
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172 | */ |
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173 | public function getItems(array $keys = []) |
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174 | { |
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175 | if (\count($this->deferred) > 0) { |
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176 | $this->commit(); |
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177 | } |
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178 | $kIds = []; |
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179 | |||||
180 | foreach ($keys as $key) { |
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181 | $kIds[] = $this->getId($key); |
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182 | } |
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183 | |||||
184 | $items = $this->doFetch($kIds); |
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185 | $kIds = \array_combine($kIds, $keys); |
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186 | |||||
187 | return $this->generateItems($items, $kIds); |
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$kIds can also be of type false ; however, parameter $keys of BiuradPHP\Cache\CacheItemPool::generateItems() does only seem to accept array , maybe add an additional type check?
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188 | } |
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189 | |||||
190 | /** |
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191 | * {@inheritdoc} |
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192 | */ |
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193 | public function hasItem($key) |
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194 | { |
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195 | $id = $this->getId($key); |
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196 | |||||
197 | if (isset($this->deferred[$key])) { |
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198 | $this->commit(); |
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199 | } |
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200 | |||||
201 | return $this->doHave($id); |
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202 | } |
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203 | |||||
204 | /** |
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205 | * {@inheritdoc} |
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206 | */ |
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207 | public function clear() |
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208 | { |
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209 | $this->deferred = []; |
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210 | |||||
211 | return $this->doClear(); |
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212 | } |
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213 | |||||
214 | /** |
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215 | * {@inheritdoc} |
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216 | */ |
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217 | public function deleteItem($key) |
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218 | { |
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219 | return $this->deleteItems([$key]); |
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220 | } |
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221 | |||||
222 | /** |
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223 | * {@inheritdoc} |
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224 | */ |
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225 | public function deleteItems(array $keys) |
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226 | { |
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227 | $kIds = []; |
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228 | |||||
229 | foreach ($keys as $key) { |
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230 | $kIds[$key] = $this->getId($key); |
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231 | unset($this->deferred[$key]); |
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232 | } |
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233 | |||||
234 | return $this->doDelete($kIds); |
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235 | } |
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236 | |||||
237 | /** |
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238 | * {@inheritdoc} |
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239 | */ |
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240 | public function save(CacheItemInterface $item) |
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241 | { |
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242 | $this->saveDeferred($item); |
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243 | |||||
244 | return $this->commit(); |
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245 | } |
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246 | |||||
247 | /** |
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248 | * {@inheritdoc} |
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249 | */ |
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250 | public function saveDeferred(CacheItemInterface $item) |
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251 | { |
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252 | $this->deferred[$item->getKey()] = $item; |
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253 | |||||
254 | return true; |
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255 | } |
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256 | |||||
257 | /** |
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258 | * {@inheritdoc} |
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259 | */ |
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260 | public function commit() |
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261 | { |
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262 | $ok = true; |
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263 | $byLifetime = $this->mergeByLifetime; |
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264 | $this->deferred = $expiredIds = []; |
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265 | $byLifetime = $byLifetime($this->deferred, $expiredIds); |
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266 | |||||
267 | if (count($expiredIds) > 0) { |
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268 | $this->doDelete($expiredIds); |
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269 | } |
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270 | |||||
271 | foreach ($byLifetime as $lifetime => $values) { |
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272 | if ($this->doSave($values, $lifetime)) { |
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273 | continue; |
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274 | } |
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275 | |||||
276 | $ok = false; |
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277 | } |
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278 | |||||
279 | return $ok; |
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280 | } |
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281 | |||||
282 | /** |
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283 | * Fetches several cache items. |
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284 | * |
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285 | * @param array<mixed,string> $ids The cache identifiers to fetch |
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286 | * |
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287 | * @return iterable<string,CacheItemInterface> The corresponding values found in the cache |
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288 | */ |
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289 | protected function doFetch(array $ids) |
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290 | { |
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291 | $fetched = $this->pool->getMultiple($ids, $this->miss); |
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292 | |||||
293 | if ($fetched instanceof Generator) { |
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294 | $fetched = $fetched->getReturn(); |
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295 | } |
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296 | |||||
297 | foreach ($fetched as $key => $value) { |
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298 | if ($this->miss !== $value) { |
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299 | yield $key => $value; |
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300 | } |
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301 | } |
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302 | } |
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303 | |||||
304 | /** |
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305 | * Confirms if the cache contains specified cache item. |
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306 | * |
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307 | * @param string $id The identifier for which to check existence |
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308 | * |
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309 | * @return bool True if item exists in the cache, false otherwise |
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310 | */ |
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311 | protected function doHave(string $id) |
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312 | { |
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313 | return $this->pool->has($id); |
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314 | } |
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315 | |||||
316 | /** |
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317 | * Deletes all items in the pool. |
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318 | * |
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319 | * @return bool True if the pool was successfully cleared, false otherwise |
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320 | */ |
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321 | protected function doClear() |
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322 | { |
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323 | return $this->pool->clear(); |
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324 | } |
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325 | |||||
326 | /** |
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327 | * Removes multiple items from the pool. |
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328 | * |
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329 | * @param array<string,string> $ids An array of identifiers that should be removed from the pool |
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330 | * |
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331 | * @return bool True if the items were successfully removed, false otherwise |
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332 | */ |
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333 | protected function doDelete(array $ids) |
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334 | { |
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335 | return $this->pool->deleteMultiple($ids); |
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336 | } |
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337 | |||||
338 | /** |
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339 | * Persists several cache items immediately. |
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340 | * |
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341 | * @param array<string,mixed> $values The values to cache, indexed by their cache identifier |
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342 | * @param int $lifetime The lifetime of the cached values, 0 for persisting until manual cleaning |
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343 | * |
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344 | * @return bool a boolean stating if caching succeeded or not |
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345 | */ |
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346 | protected function doSave(array $values, int $lifetime) |
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347 | { |
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348 | return $this->pool->setMultiple($values, 0 === $lifetime ? null : $lifetime); |
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349 | } |
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350 | |||||
351 | /** |
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352 | * @param iterable<string,mixed> $items |
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353 | * @param array<string,string> $keys |
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354 | * |
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355 | * @return iterable<string,CacheItemInterface> |
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356 | */ |
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357 | private function generateItems(iterable $items, array &$keys): iterable |
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358 | { |
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359 | $f = $this->createCacheItem; |
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360 | |||||
361 | foreach ($items as $id => $value) { |
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362 | if (!isset($keys[$id])) { |
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363 | $id = \key($keys); |
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364 | } |
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365 | $key = $keys[$id]; |
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366 | unset($keys[$id]); |
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367 | |||||
368 | yield $key => $f($key, $value, true); |
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369 | } |
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370 | |||||
371 | foreach ($keys as $key) { |
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372 | yield $key => $f($key, null, false); |
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373 | } |
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374 | } |
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375 | |||||
376 | /** |
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377 | * @param mixed $key |
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378 | * |
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379 | * @return string |
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380 | */ |
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381 | private function getId($key) |
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382 | { |
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383 | if (\is_string($key) && isset($this->ids[$key])) { |
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384 | return $this->ids[$key]; |
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385 | } |
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386 | CacheItem::validateKey($key); |
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387 | $this->ids[$key] = $key; |
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388 | |||||
389 | return $key; |
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390 | } |
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391 | } |
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392 |