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Diffstat (limited to 'vendor/smarty/smarty/docs/programmers/caching/caching-custom.md')
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diff --git a/vendor/smarty/smarty/docs/programmers/caching/caching-custom.md b/vendor/smarty/smarty/docs/programmers/caching/caching-custom.md deleted file mode 100644 index 77d2ce7b3..000000000 --- a/vendor/smarty/smarty/docs/programmers/caching/caching-custom.md +++ /dev/null @@ -1,296 +0,0 @@ -Custom Cache Implementation {#caching.custom} -=========================== - -As an alternative to using the default file-based caching mechanism, you -can specify a custom cache implementation that will be used to read, -write and clear cached files. - -> **Note** -> -> In Smarty2 this used to be a callback function called -> `$cache_handler_func`. Smarty3 replaced this callback by the -> `Smarty_CacheResource` module. - -With a custom cache implementation you\'re likely trying to achieve at -least one of the following goals: replace the slow filesystem by a -faster storage engine, centralize the cache to be accessible to multiple -servers. - -Smarty allows CacheResource implementations to use one of the APIs -`Smarty_CacheResource_Custom` or `Smarty_CacheResource_KeyValueStore`. -`Smarty_CacheResource_Custom` is a simple API directing all read, write, -clear calls to your implementation. This API allows you to store -wherever and however you deem fit. The -`Smarty_CacheResource_KeyValueStore` API allows you to turn any \"dumb\" -KeyValue-Store (like APC, Memcache, ...) into a full-featured -CacheResource implementation. That is, everything around deep -cache-groups like \"a\|b\|c\" is being handled for you in way that -allows clearing the cache-group \"a\" and all nested groups are cleared -as well - even though KeyValue-Stores don\'t allow this kind of -hierarchy by nature. - -Custom CacheResources may be put in a file `cacheresource.foobarxyz.php` -within your [`$plugins_dir`](#variable.plugins.dir), or registered on -runtime with [`registerCacheResource()`](#api.register.cacheresource). -In either case you need to set [`$caching_type`](#variable.caching.type) -to invoke your custom CacheResource implementation. - - - <?php - - require_once 'libs/Smarty.class.php'; - $smarty = new Smarty(); - $smarty->caching_type = 'mysql'; - - /** - * MySQL CacheResource - * - * CacheResource Implementation based on the Custom API to use - * MySQL as the storage resource for Smarty's output caching. - * - * Table definition: - * <pre>CREATE TABLE IF NOT EXISTS `output_cache` ( - * `id` CHAR(40) NOT NULL COMMENT 'sha1 hash', - * `name` VARCHAR(250) NOT NULL, - * `cache_id` VARCHAR(250) NULL DEFAULT NULL, - * `compile_id` VARCHAR(250) NULL DEFAULT NULL, - * `modified` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, - * `content` LONGTEXT NOT NULL, - * PRIMARY KEY (`id`), - * INDEX(`name`), - * INDEX(`cache_id`), - * INDEX(`compile_id`), - * INDEX(`modified`) - * ) ENGINE = InnoDB;</pre> - * - * @package CacheResource-examples - * @author Rodney Rehm - */ - class Smarty_CacheResource_Mysql extends Smarty_CacheResource_Custom { - // PDO instance - protected $db; - protected $fetch; - protected $fetchTimestamp; - protected $save; - - public function __construct() { - try { - $this->db = new PDO("mysql:dbname=test;host=127.0.0.1", "smarty", "smarty"); - } catch (PDOException $e) { - throw new SmartyException('Mysql Resource failed: ' . $e->getMessage()); - } - $this->fetch = $this->db->prepare('SELECT modified, content FROM output_cache WHERE id = :id'); - $this->fetchTimestamp = $this->db->prepare('SELECT modified FROM output_cache WHERE id = :id'); - $this->save = $this->db->prepare('REPLACE INTO output_cache (id, name, cache_id, compile_id, content) - VALUES (:id, :name, :cache_id, :compile_id, :content)'); - } - - /** - * fetch cached content and its modification time from data source - * - * @param string $id unique cache content identifier - * @param string $name template name - * @param string $cache_id cache id - * @param string $compile_id compile id - * @param string $content cached content - * @param integer $mtime cache modification timestamp (epoch) - * @return void - */ - protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime) - { - $this->fetch->execute(array('id' => $id)); - $row = $this->fetch->fetch(); - $this->fetch->closeCursor(); - if ($row) { - $content = $row['content']; - $mtime = strtotime($row['modified']); - } else { - $content = null; - $mtime = null; - } - } - - /** - * Fetch cached content's modification timestamp from data source - * - * @note implementing this method is optional. Only implement it if modification times can be accessed faster than loading the complete cached content. - * @param string $id unique cache content identifier - * @param string $name template name - * @param string $cache_id cache id - * @param string $compile_id compile id - * @return integer|boolean timestamp (epoch) the template was modified, or false if not found - */ - protected function fetchTimestamp($id, $name, $cache_id, $compile_id) - { - $this->fetchTimestamp->execute(array('id' => $id)); - $mtime = strtotime($this->fetchTimestamp->fetchColumn()); - $this->fetchTimestamp->closeCursor(); - return $mtime; - } - - /** - * Save content to cache - * - * @param string $id unique cache content identifier - * @param string $name template name - * @param string $cache_id cache id - * @param string $compile_id compile id - * @param integer|null $exp_time seconds till expiration time in seconds or null - * @param string $content content to cache - * @return boolean success - */ - protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content) - { - $this->save->execute(array( - 'id' => $id, - 'name' => $name, - 'cache_id' => $cache_id, - 'compile_id' => $compile_id, - 'content' => $content, - )); - return !!$this->save->rowCount(); - } - - /** - * Delete content from cache - * - * @param string $name template name - * @param string $cache_id cache id - * @param string $compile_id compile id - * @param integer|null $exp_time seconds till expiration or null - * @return integer number of deleted caches - */ - protected function delete($name, $cache_id, $compile_id, $exp_time) - { - // delete the whole cache - if ($name === null && $cache_id === null && $compile_id === null && $exp_time === null) { - // returning the number of deleted caches would require a second query to count them - $query = $this->db->query('TRUNCATE TABLE output_cache'); - return -1; - } - // build the filter - $where = array(); - // equal test name - if ($name !== null) { - $where[] = 'name = ' . $this->db->quote($name); - } - // equal test compile_id - if ($compile_id !== null) { - $where[] = 'compile_id = ' . $this->db->quote($compile_id); - } - // range test expiration time - if ($exp_time !== null) { - $where[] = 'modified < DATE_SUB(NOW(), INTERVAL ' . intval($exp_time) . ' SECOND)'; - } - // equal test cache_id and match sub-groups - if ($cache_id !== null) { - $where[] = '(cache_id = '. $this->db->quote($cache_id) - . ' OR cache_id LIKE '. $this->db->quote($cache_id .'|%') .')'; - } - // run delete query - $query = $this->db->query('DELETE FROM output_cache WHERE ' . join(' AND ', $where)); - return $query->rowCount(); - } - } - - - - - <?php - - require_once 'libs/Smarty.class.php'; - $smarty = new Smarty(); - $smarty->caching_type = 'memcache'; - - /** - * Memcache CacheResource - * - * CacheResource Implementation based on the KeyValueStore API to use - * memcache as the storage resource for Smarty's output caching. - * - * Note that memcache has a limitation of 256 characters per cache-key. - * To avoid complications all cache-keys are translated to a sha1 hash. - * - * @package CacheResource-examples - * @author Rodney Rehm - */ - class Smarty_CacheResource_Memcache extends Smarty_CacheResource_KeyValueStore { - /** - * memcache instance - * @var Memcache - */ - protected $memcache = null; - - public function __construct() - { - $this->memcache = new Memcache(); - $this->memcache->addServer( '127.0.0.1', 11211 ); - } - - /** - * Read values for a set of keys from cache - * - * @param array $keys list of keys to fetch - * @return array list of values with the given keys used as indexes - * @return boolean true on success, false on failure - */ - protected function read(array $keys) - { - $_keys = $lookup = array(); - foreach ($keys as $k) { - $_k = sha1($k); - $_keys[] = $_k; - $lookup[$_k] = $k; - } - $_res = array(); - $res = $this->memcache->get($_keys); - foreach ($res as $k => $v) { - $_res[$lookup[$k]] = $v; - } - return $_res; - } - - /** - * Save values for a set of keys to cache - * - * @param array $keys list of values to save - * @param int $expire expiration time - * @return boolean true on success, false on failure - */ - protected function write(array $keys, $expire=null) - { - foreach ($keys as $k => $v) { - $k = sha1($k); - $this->memcache->set($k, $v, 0, $expire); - } - return true; - } - - /** - * Remove values from cache - * - * @param array $keys list of keys to delete - * @return boolean true on success, false on failure - */ - protected function delete(array $keys) - { - foreach ($keys as $k) { - $k = sha1($k); - $this->memcache->delete($k); - } - return true; - } - - /** - * Remove *all* values from cache - * - * @return boolean true on success, false on failure - */ - protected function purge() - { - return $this->memcache->flush(); - } - } - - - |