/framework/vendor/zend/Zend/Cache/Backend/TwoLevels.php
PHP | 506 lines | 228 code | 31 blank | 247 comment | 35 complexity | 39ebf1a95035993da21b17bd3d5b6001 MD5 | raw file
Possible License(s): BSD-3-Clause, LGPL-2.1
1<?php 2/** 3 * Zend Framework 4 * 5 * LICENSE 6 * 7 * This source file is subject to the new BSD license that is bundled 8 * with this package in the file LICENSE.txt. 9 * It is also available through the world-wide-web at this URL: 10 * http://framework.zend.com/license/new-bsd 11 * If you did not receive a copy of the license and are unable to 12 * obtain it through the world-wide-web, please send an email 13 * to license@zend.com so we can send you a copy immediately. 14 * 15 * @category Zend 16 * @package Zend_Cache 17 * @subpackage Zend_Cache_Backend 18 * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) 19 * @license http://framework.zend.com/license/new-bsd New BSD License 20 * @version $Id: TwoLevels.php 20096 2010-01-06 02:05:09Z bkarwin $ 21 */ 22 23 24/** 25 * @see Zend_Cache_Backend_ExtendedInterface 26 */ 27require_once 'Zend/Cache/Backend/ExtendedInterface.php'; 28 29/** 30 * @see Zend_Cache_Backend 31 */ 32require_once 'Zend/Cache/Backend.php'; 33 34 35/** 36 * @package Zend_Cache 37 * @subpackage Zend_Cache_Backend 38 * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) 39 * @license http://framework.zend.com/license/new-bsd New BSD License 40 */ 41 42class Zend_Cache_Backend_TwoLevels extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface 43{ 44 /** 45 * Available options 46 * 47 * =====> (string) slow_backend : 48 * - Slow backend name 49 * - Must implement the Zend_Cache_Backend_ExtendedInterface 50 * - Should provide a big storage 51 * 52 * =====> (string) fast_backend : 53 * - Flow backend name 54 * - Must implement the Zend_Cache_Backend_ExtendedInterface 55 * - Must be much faster than slow_backend 56 * 57 * =====> (array) slow_backend_options : 58 * - Slow backend options (see corresponding backend) 59 * 60 * =====> (array) fast_backend_options : 61 * - Fast backend options (see corresponding backend) 62 * 63 * =====> (int) stats_update_factor : 64 * - Disable / Tune the computation of the fast backend filling percentage 65 * - When saving a record into cache : 66 * 1 => systematic computation of the fast backend filling percentage 67 * x (integer) > 1 => computation of the fast backend filling percentage randomly 1 times on x cache write 68 * 69 * =====> (boolean) slow_backend_custom_naming : 70 * =====> (boolean) fast_backend_custom_naming : 71 * =====> (boolean) slow_backend_autoload : 72 * =====> (boolean) fast_backend_autoload : 73 * - See Zend_Cache::factory() method 74 * 75 * =====> (boolean) auto_refresh_fast_cache 76 * - If true, auto refresh the fast cache when a cache record is hit 77 * 78 * @var array available options 79 */ 80 protected $_options = array( 81 'slow_backend' => 'File', 82 'fast_backend' => 'Apc', 83 'slow_backend_options' => array(), 84 'fast_backend_options' => array(), 85 'stats_update_factor' => 10, 86 'slow_backend_custom_naming' => false, 87 'fast_backend_custom_naming' => false, 88 'slow_backend_autoload' => false, 89 'fast_backend_autoload' => false, 90 'auto_refresh_fast_cache' => true 91 ); 92 93 /** 94 * Slow Backend 95 * 96 * @var Zend_Cache_Backend 97 */ 98 protected $_slowBackend; 99 100 /** 101 * Fast Backend 102 * 103 * @var Zend_Cache_Backend 104 */ 105 protected $_fastBackend; 106 107 /** 108 * Cache for the fast backend filling percentage 109 * 110 * @var int 111 */ 112 protected $_fastBackendFillingPercentage = null; 113 114 /** 115 * Constructor 116 * 117 * @param array $options Associative array of options 118 * @throws Zend_Cache_Exception 119 * @return void 120 */ 121 public function __construct(array $options = array()) 122 { 123 parent::__construct($options); 124 if ($this->_options['slow_backend'] === null) { 125 Zend_Cache::throwException('slow_backend option has to set'); 126 } 127 if ($this->_options['fast_backend'] === null) { 128 Zend_Cache::throwException('fast_backend option has to set'); 129 } 130 $this->_slowBackend = Zend_Cache::_makeBackend($this->_options['slow_backend'], $this->_options['slow_backend_options'], $this->_options['slow_backend_custom_naming'], $this->_options['slow_backend_autoload']); 131 $this->_fastBackend = Zend_Cache::_makeBackend($this->_options['fast_backend'], $this->_options['fast_backend_options'], $this->_options['fast_backend_custom_naming'], $this->_options['fast_backend_autoload']); 132 if (!in_array('Zend_Cache_Backend_ExtendedInterface', class_implements($this->_slowBackend))) { 133 Zend_Cache::throwException('slow_backend must implement the Zend_Cache_Backend_ExtendedInterface interface'); 134 } 135 if (!in_array('Zend_Cache_Backend_ExtendedInterface', class_implements($this->_fastBackend))) { 136 Zend_Cache::throwException('fast_backend must implement the Zend_Cache_Backend_ExtendedInterface interface'); 137 } 138 $this->_slowBackend->setDirectives($this->_directives); 139 $this->_fastBackend->setDirectives($this->_directives); 140 } 141 142 /** 143 * Test if a cache is available or not (for the given id) 144 * 145 * @param string $id cache id 146 * @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record 147 */ 148 public function test($id) 149 { 150 $fastTest = $this->_fastBackend->test($id); 151 if ($fastTest) { 152 return $fastTest; 153 } else { 154 return $this->_slowBackend->test($id); 155 } 156 } 157 158 /** 159 * Save some string datas into a cache record 160 * 161 * Note : $data is always "string" (serialization is done by the 162 * core not by the backend) 163 * 164 * @param string $data Datas to cache 165 * @param string $id Cache id 166 * @param array $tags Array of strings, the cache record will be tagged by each string entry 167 * @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime) 168 * @param int $priority integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends 169 * @return boolean true if no problem 170 */ 171 public function save($data, $id, $tags = array(), $specificLifetime = false, $priority = 8) 172 { 173 $usage = $this->_getFastFillingPercentage('saving'); 174 $boolFast = true; 175 $lifetime = $this->getLifetime($specificLifetime); 176 $preparedData = $this->_prepareData($data, $lifetime, $priority); 177 if (($priority > 0) && (10 * $priority >= $usage)) { 178 $fastLifetime = $this->_getFastLifetime($lifetime, $priority); 179 $boolFast = $this->_fastBackend->save($preparedData, $id, array(), $fastLifetime); 180 } 181 $boolSlow = $this->_slowBackend->save($preparedData, $id, $tags, $lifetime); 182 return ($boolFast && $boolSlow); 183 } 184 185 /** 186 * Test if a cache is available for the given id and (if yes) return it (false else) 187 * 188 * Note : return value is always "string" (unserialization is done by the core not by the backend) 189 * 190 * @param string $id Cache id 191 * @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested 192 * @return string|false cached datas 193 */ 194 public function load($id, $doNotTestCacheValidity = false) 195 { 196 $res = $this->_fastBackend->load($id, $doNotTestCacheValidity); 197 if ($res === false) { 198 $res = $this->_slowBackend->load($id, $doNotTestCacheValidity); 199 if ($res === false) { 200 // there is no cache at all for this id 201 return false; 202 } 203 } 204 $array = unserialize($res); 205 // maybe, we have to refresh the fast cache ? 206 if ($this->_options['auto_refresh_fast_cache']) { 207 if ($array['priority'] == 10) { 208 // no need to refresh the fast cache with priority = 10 209 return $array['data']; 210 } 211 $newFastLifetime = $this->_getFastLifetime($array['lifetime'], $array['priority'], time() - $array['expire']); 212 // we have the time to refresh the fast cache 213 $usage = $this->_getFastFillingPercentage('loading'); 214 if (($array['priority'] > 0) && (10 * $array['priority'] >= $usage)) { 215 // we can refresh the fast cache 216 $preparedData = $this->_prepareData($array['data'], $array['lifetime'], $array['priority']); 217 $this->_fastBackend->save($preparedData, $id, array(), $newFastLifetime); 218 } 219 } 220 return $array['data']; 221 } 222 223 /** 224 * Remove a cache record 225 * 226 * @param string $id Cache id 227 * @return boolean True if no problem 228 */ 229 public function remove($id) 230 { 231 $boolFast = $this->_fastBackend->remove($id); 232 $boolSlow = $this->_slowBackend->remove($id); 233 return $boolFast && $boolSlow; 234 } 235 236 /** 237 * Clean some cache records 238 * 239 * Available modes are : 240 * Zend_Cache::CLEANING_MODE_ALL (default) => remove all cache entries ($tags is not used) 241 * Zend_Cache::CLEANING_MODE_OLD => remove too old cache entries ($tags is not used) 242 * Zend_Cache::CLEANING_MODE_MATCHING_TAG => remove cache entries matching all given tags 243 * ($tags can be an array of strings or a single string) 244 * Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags} 245 * ($tags can be an array of strings or a single string) 246 * Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags 247 * ($tags can be an array of strings or a single string) 248 * 249 * @param string $mode Clean mode 250 * @param array $tags Array of tags 251 * @throws Zend_Cache_Exception 252 * @return boolean true if no problem 253 */ 254 public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array()) 255 { 256 switch($mode) { 257 case Zend_Cache::CLEANING_MODE_ALL: 258 $boolFast = $this->_fastBackend->clean(Zend_Cache::CLEANING_MODE_ALL); 259 $boolSlow = $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_ALL); 260 return $boolFast && $boolSlow; 261 break; 262 case Zend_Cache::CLEANING_MODE_OLD: 263 return $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_OLD); 264 case Zend_Cache::CLEANING_MODE_MATCHING_TAG: 265 $ids = $this->_slowBackend->getIdsMatchingTags($tags); 266 $res = true; 267 foreach ($ids as $id) { 268 $bool = $this->remove($id); 269 $res = $res && $bool; 270 } 271 return $res; 272 break; 273 case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG: 274 $ids = $this->_slowBackend->getIdsNotMatchingTags($tags); 275 $res = true; 276 foreach ($ids as $id) { 277 $bool = $this->remove($id); 278 $res = $res && $bool; 279 } 280 return $res; 281 break; 282 case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG: 283 $ids = $this->_slowBackend->getIdsMatchingAnyTags($tags); 284 $res = true; 285 foreach ($ids as $id) { 286 $bool = $this->remove($id); 287 $res = $res && $bool; 288 } 289 return $res; 290 break; 291 default: 292 Zend_Cache::throwException('Invalid mode for clean() method'); 293 break; 294 } 295 } 296 297 /** 298 * Return an array of stored cache ids 299 * 300 * @return array array of stored cache ids (string) 301 */ 302 public function getIds() 303 { 304 return $this->_slowBackend->getIds(); 305 } 306 307 /** 308 * Return an array of stored tags 309 * 310 * @return array array of stored tags (string) 311 */ 312 public function getTags() 313 { 314 return $this->_slowBackend->getTags(); 315 } 316 317 /** 318 * Return an array of stored cache ids which match given tags 319 * 320 * In case of multiple tags, a logical AND is made between tags 321 * 322 * @param array $tags array of tags 323 * @return array array of matching cache ids (string) 324 */ 325 public function getIdsMatchingTags($tags = array()) 326 { 327 return $this->_slowBackend->getIdsMatchingTags($tags); 328 } 329 330 /** 331 * Return an array of stored cache ids which don't match given tags 332 * 333 * In case of multiple tags, a logical OR is made between tags 334 * 335 * @param array $tags array of tags 336 * @return array array of not matching cache ids (string) 337 */ 338 public function getIdsNotMatchingTags($tags = array()) 339 { 340 return $this->_slowBackend->getIdsNotMatchingTags($tags); 341 } 342 343 /** 344 * Return an array of stored cache ids which match any given tags 345 * 346 * In case of multiple tags, a logical AND is made between tags 347 * 348 * @param array $tags array of tags 349 * @return array array of any matching cache ids (string) 350 */ 351 public function getIdsMatchingAnyTags($tags = array()) 352 { 353 return $this->_slowBackend->getIdsMatchingAnyTags($tags); 354 } 355 356 357 /** 358 * Return the filling percentage of the backend storage 359 * 360 * @return int integer between 0 and 100 361 */ 362 public function getFillingPercentage() 363 { 364 return $this->_slowBackend->getFillingPercentage(); 365 } 366 367 /** 368 * Return an array of metadatas for the given cache id 369 * 370 * The array must include these keys : 371 * - expire : the expire timestamp 372 * - tags : a string array of tags 373 * - mtime : timestamp of last modification time 374 * 375 * @param string $id cache id 376 * @return array array of metadatas (false if the cache id is not found) 377 */ 378 public function getMetadatas($id) 379 { 380 return $this->_slowBackend->getMetadatas($id); 381 } 382 383 /** 384 * Give (if possible) an extra lifetime to the given cache id 385 * 386 * @param string $id cache id 387 * @param int $extraLifetime 388 * @return boolean true if ok 389 */ 390 public function touch($id, $extraLifetime) 391 { 392 return $this->_slowBackend->touch($id, $extraLifetime); 393 } 394 395 /** 396 * Return an associative array of capabilities (booleans) of the backend 397 * 398 * The array must include these keys : 399 * - automatic_cleaning (is automating cleaning necessary) 400 * - tags (are tags supported) 401 * - expired_read (is it possible to read expired cache records 402 * (for doNotTestCacheValidity option for example)) 403 * - priority does the backend deal with priority when saving 404 * - infinite_lifetime (is infinite lifetime can work with this backend) 405 * - get_list (is it possible to get the list of cache ids and the complete list of tags) 406 * 407 * @return array associative of with capabilities 408 */ 409 public function getCapabilities() 410 { 411 $slowBackendCapabilities = $this->_slowBackend->getCapabilities(); 412 return array( 413 'automatic_cleaning' => $slowBackendCapabilities['automatic_cleaning'], 414 'tags' => $slowBackendCapabilities['tags'], 415 'expired_read' => $slowBackendCapabilities['expired_read'], 416 'priority' => $slowBackendCapabilities['priority'], 417 'infinite_lifetime' => $slowBackendCapabilities['infinite_lifetime'], 418 'get_list' => $slowBackendCapabilities['get_list'] 419 ); 420 } 421 422 /** 423 * Prepare a serialized array to store datas and metadatas informations 424 * 425 * @param string $data data to store 426 * @param int $lifetime original lifetime 427 * @param int $priority priority 428 * @return string serialize array to store into cache 429 */ 430 private function _prepareData($data, $lifetime, $priority) 431 { 432 $lt = $lifetime; 433 if ($lt === null) { 434 $lt = 9999999999; 435 } 436 return serialize(array( 437 'data' => $data, 438 'lifetime' => $lifetime, 439 'expire' => time() + $lt, 440 'priority' => $priority 441 )); 442 } 443 444 /** 445 * Compute and return the lifetime for the fast backend 446 * 447 * @param int $lifetime original lifetime 448 * @param int $priority priority 449 * @param int $maxLifetime maximum lifetime 450 * @return int lifetime for the fast backend 451 */ 452 private function _getFastLifetime($lifetime, $priority, $maxLifetime = null) 453 { 454 if ($lifetime === null) { 455 // if lifetime is null, we have an infinite lifetime 456 // we need to use arbitrary lifetimes 457 $fastLifetime = (int) (2592000 / (11 - $priority)); 458 } else { 459 $fastLifetime = (int) ($lifetime / (11 - $priority)); 460 } 461 if (($maxLifetime !== null) && ($maxLifetime >= 0)) { 462 if ($fastLifetime > $maxLifetime) { 463 return $maxLifetime; 464 } 465 } 466 return $fastLifetime; 467 } 468 469 /** 470 * PUBLIC METHOD FOR UNIT TESTING ONLY ! 471 * 472 * Force a cache record to expire 473 * 474 * @param string $id cache id 475 */ 476 public function ___expire($id) 477 { 478 $this->_fastBackend->remove($id); 479 $this->_slowBackend->___expire($id); 480 } 481 482 private function _getFastFillingPercentage($mode) 483 { 484 485 if ($mode == 'saving') { 486 // mode saving 487 if ($this->_fastBackendFillingPercentage === null) { 488 $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage(); 489 } else { 490 $rand = rand(1, $this->_options['stats_update_factor']); 491 if ($rand == 1) { 492 // we force a refresh 493 $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage(); 494 } 495 } 496 } else { 497 // mode loading 498 // we compute the percentage only if it's not available in cache 499 if ($this->_fastBackendFillingPercentage === null) { 500 $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage(); 501 } 502 } 503 return $this->_fastBackendFillingPercentage; 504 } 505 506}