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Code Editor : cache.inc
<?php /** * @file * Functions and interfaces for cache handling. */ /** * Gets the cache object for a cache bin. * * By default, this returns an instance of the DrupalDatabaseCache class. * Classes implementing DrupalCacheInterface can register themselves both as a * default implementation and for specific bins. * * @param $bin * The cache bin for which the cache object should be returned. * @return DrupalCacheInterface * The cache object associated with the specified bin. * * @see DrupalCacheInterface */ function _cache_get_object($bin) { // We do not use drupal_static() here because we do not want to change the // storage of a cache bin mid-request. static $cache_objects; if (!isset($cache_objects[$bin])) { $class = variable_get('cache_class_' . $bin); if (!isset($class)) { $class = variable_get('cache_default_class', 'DrupalDatabaseCache'); } $cache_objects[$bin] = new $class($bin); } return $cache_objects[$bin]; } /** * Returns data from the persistent cache. * * Data may be stored as either plain text or as serialized data. cache_get * will automatically return unserialized objects and arrays. * * @param $cid * The cache ID of the data to retrieve. * @param $bin * The cache bin to store the data in. Valid core values are 'cache_block', * 'cache_bootstrap', 'cache_field', 'cache_filter', 'cache_form', * 'cache_menu', 'cache_page', 'cache_path', 'cache_update' or 'cache' for * the default cache. * * @return * The cache or FALSE on failure. * * @see cache_set() */ function cache_get($cid, $bin = 'cache') { return _cache_get_object($bin)->get($cid); } /** * Returns data from the persistent cache when given an array of cache IDs. * * @param $cids * An array of cache IDs for the data to retrieve. This is passed by * reference, and will have the IDs successfully returned from cache removed. * @param $bin * The cache bin where the data is stored. * * @return * An array of the items successfully returned from cache indexed by cid. */ function cache_get_multiple(array &$cids, $bin = 'cache') { return _cache_get_object($bin)->getMultiple($cids); } /** * Stores data in the persistent cache. * * The persistent cache is split up into several cache bins. In the default * cache implementation, each cache bin corresponds to a database table by the * same name. Other implementations might want to store several bins in data * structures that get flushed together. While it is not a problem for most * cache bins if the entries in them are flushed before their expire time, some * might break functionality or are extremely expensive to recalculate. The * other bins are expired automatically by core. Contributed modules can add * additional bins and get them expired automatically by implementing * hook_flush_caches(). * * The reasons for having several bins are as follows: * - Smaller bins mean smaller database tables and allow for faster selects and * inserts. * - We try to put fast changing cache items and rather static ones into * different bins. The effect is that only the fast changing bins will need a * lot of writes to disk. The more static bins will also be better cacheable * with MySQL's query cache. * * @param $cid * The cache ID of the data to store. * @param $data * The data to store in the cache. Complex data types will be automatically * serialized before insertion. Strings will be stored as plain text and are * not serialized. Some storage engines only allow objects up to a maximum of * 1MB in size to be stored by default. When caching large arrays or similar, * take care to ensure $data does not exceed this size. * @param $bin * (optional) The cache bin to store the data in. Valid core values are: * - cache: (default) Generic cache storage bin (used for theme registry, * locale date, list of simpletest tests, etc.). * - cache_block: Stores the content of various blocks. * - cache_bootstrap: Stores the class registry, the system list of modules, * the list of which modules implement which hooks, and the Drupal variable * list. * - cache_field: Stores the field data belonging to a given object. * - cache_filter: Stores filtered pieces of content. * - cache_form: Stores multistep forms. Flushing this bin means that some * forms displayed to users lose their state and the data already submitted * to them. This bin should not be flushed before its expired time. * - cache_menu: Stores the structure of visible navigation menus per page. * - cache_page: Stores generated pages for anonymous users. It is flushed * very often, whenever a page changes, at least for every node and comment * submission. This is the only bin affected by the page cache setting on * the administrator panel. * - cache_path: Stores the system paths that have an alias. * @param $expire * (optional) One of the following values: * - CACHE_PERMANENT: Indicates that the item should never be removed unless * explicitly told to using cache_clear_all() with a cache ID. * - CACHE_TEMPORARY: Indicates that the item should be removed at the next * general cache wipe. * - A Unix timestamp: Indicates that the item should be kept at least until * the given time, after which it behaves like CACHE_TEMPORARY. * * @see _update_cache_set() * @see cache_get() */ function cache_set($cid, $data, $bin = 'cache', $expire = CACHE_PERMANENT) { return _cache_get_object($bin)->set($cid, $data, $expire); } /** * Expires data from the cache. * * If called with the arguments $cid and $bin set to NULL or omitted, then * expirable entries will be cleared from the cache_page and cache_block bins, * and the $wildcard argument is ignored. * * @param $cid * If set, the cache ID or an array of cache IDs. Otherwise, all cache entries * that can expire are deleted. The $wildcard argument will be ignored if set * to NULL. * @param $bin * If set, the cache bin to delete from. Mandatory argument if $cid is set. * @param $wildcard * If TRUE, the $cid argument must contain a string value and cache IDs * starting with $cid are deleted in addition to the exact cache ID specified * by $cid. If $wildcard is TRUE and $cid is '*', the entire cache is emptied. */ function cache_clear_all($cid = NULL, $bin = NULL, $wildcard = FALSE) { if (!isset($cid) && !isset($bin)) { // Clear the block cache first, so stale data will // not end up in the page cache. if (module_exists('block')) { cache_clear_all(NULL, 'cache_block'); } cache_clear_all(NULL, 'cache_page'); return; } return _cache_get_object($bin)->clear($cid, $wildcard); } /** * Checks if a cache bin is empty. * * A cache bin is considered empty if it does not contain any valid data for any * cache ID. * * @param $bin * The cache bin to check. * * @return * TRUE if the cache bin specified is empty. */ function cache_is_empty($bin) { return _cache_get_object($bin)->isEmpty(); } /** * Defines an interface for cache implementations. * * All cache implementations have to implement this interface. * DrupalDatabaseCache provides the default implementation, which can be * consulted as an example. * * To make Drupal use your implementation for a certain cache bin, you have to * set a variable with the name of the cache bin as its key and the name of * your class as its value. For example, if your implementation of * DrupalCacheInterface was called MyCustomCache, the following line would make * Drupal use it for the 'cache_page' bin: * @code * variable_set('cache_class_cache_page', 'MyCustomCache'); * @endcode * * Additionally, you can register your cache implementation to be used by * default for all cache bins by setting the variable 'cache_default_class' to * the name of your implementation of the DrupalCacheInterface, e.g. * @code * variable_set('cache_default_class', 'MyCustomCache'); * @endcode * * To implement a completely custom cache bin, use the same variable format: * @code * variable_set('cache_class_custom_bin', 'MyCustomCache'); * @endcode * To access your custom cache bin, specify the name of the bin when storing * or retrieving cached data: * @code * cache_set($cid, $data, 'custom_bin', $expire); * cache_get($cid, 'custom_bin'); * @endcode * * @see _cache_get_object() * @see DrupalDatabaseCache */ interface DrupalCacheInterface { /** * Returns data from the persistent cache. * * Data may be stored as either plain text or as serialized data. cache_get() * will automatically return unserialized objects and arrays. * * @param $cid * The cache ID of the data to retrieve. * * @return * The cache or FALSE on failure. */ function get($cid); /** * Returns data from the persistent cache when given an array of cache IDs. * * @param $cids * An array of cache IDs for the data to retrieve. This is passed by * reference, and will have the IDs successfully returned from cache * removed. * * @return * An array of the items successfully returned from cache indexed by cid. */ function getMultiple(&$cids); /** * Stores data in the persistent cache. * * @param $cid * The cache ID of the data to store. * @param $data * The data to store in the cache. Complex data types will be automatically * serialized before insertion. Strings will be stored as plain text and not * serialized. Some storage engines only allow objects up to a maximum of * 1MB in size to be stored by default. When caching large arrays or * similar, take care to ensure $data does not exceed this size. * @param $expire * (optional) One of the following values: * - CACHE_PERMANENT: Indicates that the item should never be removed unless * explicitly told to using cache_clear_all() with a cache ID. * - CACHE_TEMPORARY: Indicates that the item should be removed at the next * general cache wipe. * - A Unix timestamp: Indicates that the item should be kept at least until * the given time, after which it behaves like CACHE_TEMPORARY. */ function set($cid, $data, $expire = CACHE_PERMANENT); /** * Expires data from the cache. * * If called without arguments, expirable entries will be cleared from the * cache_page and cache_block bins. * * @param $cid * If set, the cache ID or an array of cache IDs. Otherwise, all cache * entries that can expire are deleted. The $wildcard argument will be * ignored if set to NULL. * @param $wildcard * If TRUE, the $cid argument must contain a string value and cache IDs * starting with $cid are deleted in addition to the exact cache ID * specified by $cid. If $wildcard is TRUE and $cid is '*', the entire * cache is emptied. */ function clear($cid = NULL, $wildcard = FALSE); /** * Checks if a cache bin is empty. * * A cache bin is considered empty if it does not contain any valid data for * any cache ID. * * @return * TRUE if the cache bin specified is empty. */ function isEmpty(); } /** * Defines a default cache implementation. * * This is Drupal's default cache implementation. It uses the database to store * cached data. Each cache bin corresponds to a database table by the same name. */ class DrupalDatabaseCache implements DrupalCacheInterface { protected $bin; /** * Constructs a DrupalDatabaseCache object. * * @param $bin * The cache bin for which the object is created. */ function __construct($bin) { $this->bin = $bin; } /** * Implements DrupalCacheInterface::get(). */ function get($cid) { $cids = array($cid); $cache = $this->getMultiple($cids); return reset($cache); } /** * Implements DrupalCacheInterface::getMultiple(). */ function getMultiple(&$cids) { try { // Garbage collection necessary when enforcing a minimum cache lifetime. $this->garbageCollection($this->bin); // When serving cached pages, the overhead of using db_select() was found // to add around 30% overhead to the request. Since $this->bin is a // variable, this means the call to db_query() here uses a concatenated // string. This is highly discouraged under any other circumstances, and // is used here only due to the performance overhead we would incur // otherwise. When serving an uncached page, the overhead of using // db_select() is a much smaller proportion of the request. $result = db_query('SELECT cid, data, created, expire, serialized FROM {' . db_escape_table($this->bin) . '} WHERE cid IN (:cids)', array(':cids' => $cids)); $cache = array(); foreach ($result as $item) { $item = $this->prepareItem($item); if ($item) { $cache[$item->cid] = $item; } } $cids = array_diff($cids, array_keys($cache)); return $cache; } catch (Exception $e) { // If the database is never going to be available, cache requests should // return FALSE in order to allow exception handling to occur. return array(); } } /** * Garbage collection for get() and getMultiple(). * * @param $bin * The bin being requested. */ protected function garbageCollection() { $cache_lifetime = variable_get('cache_lifetime', 0); // Clean-up the per-user cache expiration session data, so that the session // handler can properly clean-up the session data for anonymous users. if (isset($_SESSION['cache_expiration'])) { $expire = REQUEST_TIME - $cache_lifetime; foreach ($_SESSION['cache_expiration'] as $bin => $timestamp) { if ($timestamp < $expire) { unset($_SESSION['cache_expiration'][$bin]); } } if (!$_SESSION['cache_expiration']) { unset($_SESSION['cache_expiration']); } } // Garbage collection of temporary items is only necessary when enforcing // a minimum cache lifetime. if (!$cache_lifetime) { return; } // When cache lifetime is in force, avoid running garbage collection too // often since this will remove temporary cache items indiscriminately. $cache_flush = variable_get('cache_flush_' . $this->bin, 0); if ($cache_flush && ($cache_flush + $cache_lifetime <= REQUEST_TIME)) { // Reset the variable immediately to prevent a meltdown in heavy load situations. variable_set('cache_flush_' . $this->bin, 0); // Time to flush old cache data db_delete($this->bin) ->condition('expire', CACHE_PERMANENT, '<>') ->condition('expire', $cache_flush, '<=') ->execute(); } } /** * Prepares a cached item. * * Checks that items are either permanent or did not expire, and unserializes * data as appropriate. * * @param $cache * An item loaded from cache_get() or cache_get_multiple(). * * @return * The item with data unserialized as appropriate or FALSE if there is no * valid item to load. */ protected function prepareItem($cache) { global $user; if (!isset($cache->data)) { return FALSE; } // If the cached data is temporary and subject to a per-user minimum // lifetime, compare the cache entry timestamp with the user session // cache_expiration timestamp. If the cache entry is too old, ignore it. if ($cache->expire != CACHE_PERMANENT && variable_get('cache_lifetime', 0) && isset($_SESSION['cache_expiration'][$this->bin]) && $_SESSION['cache_expiration'][$this->bin] > $cache->created) { // Ignore cache data that is too old and thus not valid for this user. return FALSE; } // If the data is permanent or not subject to a minimum cache lifetime, // unserialize and return the cached data. if ($cache->serialized) { $cache->data = unserialize($cache->data); } return $cache; } /** * Implements DrupalCacheInterface::set(). */ function set($cid, $data, $expire = CACHE_PERMANENT) { $fields = array( 'serialized' => 0, 'created' => REQUEST_TIME, 'expire' => $expire, ); if (!is_string($data)) { $fields['data'] = serialize($data); $fields['serialized'] = 1; } else { $fields['data'] = $data; $fields['serialized'] = 0; } try { db_merge($this->bin) ->key(array('cid' => $cid)) ->fields($fields) ->execute(); } catch (Exception $e) { // The database may not be available, so we'll ignore cache_set requests. } } /** * Implements DrupalCacheInterface::clear(). */ function clear($cid = NULL, $wildcard = FALSE) { global $user; if (empty($cid)) { if (variable_get('cache_lifetime', 0)) { // We store the time in the current user's session. We then simulate // that the cache was flushed for this user by not returning cached // data that was cached before the timestamp. $_SESSION['cache_expiration'][$this->bin] = REQUEST_TIME; $cache_flush = variable_get('cache_flush_' . $this->bin, 0); if ($cache_flush == 0) { // This is the first request to clear the cache, start a timer. variable_set('cache_flush_' . $this->bin, REQUEST_TIME); } elseif (REQUEST_TIME > ($cache_flush + variable_get('cache_lifetime', 0))) { // Clear the cache for everyone, cache_lifetime seconds have // passed since the first request to clear the cache. db_delete($this->bin) ->condition('expire', CACHE_PERMANENT, '<>') ->condition('expire', REQUEST_TIME, '<') ->execute(); variable_set('cache_flush_' . $this->bin, 0); } } else { // No minimum cache lifetime, flush all temporary cache entries now. db_delete($this->bin) ->condition('expire', CACHE_PERMANENT, '<>') ->condition('expire', REQUEST_TIME, '<') ->execute(); } } else { if ($wildcard) { if ($cid == '*') { // Check if $this->bin is a cache table before truncating. Other // cache_clear_all() operations throw a PDO error in this situation, // so we don't need to verify them first. This ensures that non-cache // tables cannot be truncated accidentally. if ($this->isValidBin()) { db_truncate($this->bin)->execute(); } else { throw new Exception(t('Invalid or missing cache bin specified: %bin', array('%bin' => $this->bin))); } } else { db_delete($this->bin) ->condition('cid', db_like($cid) . '%', 'LIKE') ->execute(); } } elseif (is_array($cid)) { // Delete in chunks when a large array is passed. do { db_delete($this->bin) ->condition('cid', array_splice($cid, 0, 1000), 'IN') ->execute(); } while (count($cid)); } else { db_delete($this->bin) ->condition('cid', $cid) ->execute(); } } } /** * Implements DrupalCacheInterface::isEmpty(). */ function isEmpty() { $this->garbageCollection(); $query = db_select($this->bin); $query->addExpression('1'); $result = $query->range(0, 1) ->execute() ->fetchField(); return empty($result); } /** * Checks if $this->bin represents a valid cache table. * * This check is required to ensure that non-cache tables are not truncated * accidentally when calling cache_clear_all(). * * @return boolean */ function isValidBin() { if ($this->bin == 'cache' || substr($this->bin, 0, 6) == 'cache_') { // Skip schema check for bins with standard table names. return TRUE; } // These fields are required for any cache table. $fields = array('cid', 'data', 'expire', 'created', 'serialized'); // Load the table schema. $schema = drupal_get_schema($this->bin); // Confirm that all fields are present. return isset($schema['fields']) && !array_diff($fields, array_keys($schema['fields'])); } }
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