library/smarty/demo/plugins/cacheresource.memcache.php
changeset 0 4869aea77e21
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-1:000000000000 0:4869aea77e21
       
     1 <?php
       
     2 
       
     3 /**
       
     4  * Memcache CacheResource
       
     5  * CacheResource Implementation based on the KeyValueStore API to use
       
     6  * memcache as the storage resource for Smarty's output caching.
       
     7  * Note that memcache has a limitation of 256 characters per cache-key.
       
     8  * To avoid complications all cache-keys are translated to a sha1 hash.
       
     9  *
       
    10  * @package CacheResource-examples
       
    11  * @author  Rodney Rehm
       
    12  */
       
    13 class Smarty_CacheResource_Memcache extends Smarty_CacheResource_KeyValueStore {
       
    14     /**
       
    15      * memcache instance
       
    16      *
       
    17      * @var Memcache
       
    18      */
       
    19     protected $memcache = null;
       
    20 
       
    21     public function __construct() {
       
    22         $this->memcache = new Memcache();
       
    23         $this->memcache->addServer('127.0.0.1', 11211);
       
    24     }
       
    25 
       
    26     /**
       
    27      * Read values for a set of keys from cache
       
    28      *
       
    29      * @param  array $keys list of keys to fetch
       
    30      *
       
    31      * @return array   list of values with the given keys used as indexes
       
    32      * @return boolean true on success, false on failure
       
    33      */
       
    34     protected function read(array $keys) {
       
    35         $_keys = $lookup = array();
       
    36         foreach ($keys as $k) {
       
    37             $_k = sha1($k);
       
    38             $_keys[] = $_k;
       
    39             $lookup[$_k] = $k;
       
    40         }
       
    41         $_res = array();
       
    42         $res = $this->memcache->get($_keys);
       
    43         foreach ($res as $k => $v) {
       
    44             $_res[$lookup[$k]] = $v;
       
    45         }
       
    46 
       
    47         return $_res;
       
    48     }
       
    49 
       
    50     /**
       
    51      * Save values for a set of keys to cache
       
    52      *
       
    53      * @param  array $keys list of values to save
       
    54      * @param  int $expire expiration time
       
    55      *
       
    56      * @return boolean true on success, false on failure
       
    57      */
       
    58     protected function write(array $keys, $expire = null) {
       
    59         foreach ($keys as $k => $v) {
       
    60             $k = sha1($k);
       
    61             $this->memcache->set($k, $v, 0, $expire);
       
    62         }
       
    63 
       
    64         return true;
       
    65     }
       
    66 
       
    67     /**
       
    68      * Remove values from cache
       
    69      *
       
    70      * @param  array $keys list of keys to delete
       
    71      *
       
    72      * @return boolean true on success, false on failure
       
    73      */
       
    74     protected function delete(array $keys) {
       
    75         foreach ($keys as $k) {
       
    76             $k = sha1($k);
       
    77             $this->memcache->delete($k);
       
    78         }
       
    79 
       
    80         return true;
       
    81     }
       
    82 
       
    83     /**
       
    84      * Remove *all* values from cache
       
    85      *
       
    86      * @return boolean true on success, false on failure
       
    87      */
       
    88     protected function purge() {
       
    89         $this->memcache->flush();
       
    90     }
       
    91 }