src/Core/Cache/MemcachedCacheDriver.php

   1 <?php
   2
   3 namespace Friendica\Core\Cache;
   4
   5 use Friendica\Core\Cache;
   6
   7 /**
   8  * Memcached Cache Driver
   9  *
  10  * @author Hypolite Petovan <mrpetovan@gmail.com>
  11  */
  12 class MemcachedCacheDriver extends AbstractCacheDriver
  13 {
  14         use TraitCompareSet;
  15         use TraitCompareDelete;
  16
  17         /**
  18          * @var \Memcached
  19          */
  20         private $memcached;
  21
  22         public function __construct(array $memcached_hosts)
  23         {
  24                 if (!class_exists('Memcached', false)) {
  25                         throw new \Exception('Memcached class isn\'t available');
  26                 }
  27
  28                 $this->memcached = new \Memcached();
  29
  30                 $this->memcached->addServers($memcached_hosts);
  31
  32                 if (count($this->memcached->getServerList()) == 0) {
  33                         throw new \Exception('Expected Memcached servers aren\'t available, config:' . var_export($memcached_hosts, true));
  34                 }
  35         }
  36
  37         public function get($key)
  38         {
  39                 $return = null;
  40                 $cachekey = $this->getCacheKey($key);
  41
  42                 // We fetch with the hostname as key to avoid problems with other applications
  43                 $value = $this->memcached->get($cachekey);
  44
  45                 if ($this->memcached->getResultCode() === \Memcached::RES_SUCCESS) {
  46                         $return = $value;
  47                 }
  48
  49                 return $return;
  50         }
  51
  52         public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
  53         {
  54                 $cachekey = $this->getCacheKey($key);
  55
  56                 // We store with the hostname as key to avoid problems with other applications
  57                 if ($ttl > 0) {
  58                         return $this->memcached->set(
  59                                 $cachekey,
  60                                 $value,
  61                                 time() + $ttl
  62                         );
  63                 } else {
  64                         return $this->memcached->set(
  65                                 $cachekey,
  66                                 $value
  67                         );
  68                 }
  69
  70         }
  71
  72         public function delete($key)
  73         {
  74                 $cachekey = $this->getCacheKey($key);
  75                 return $this->memcached->delete($cachekey);
  76         }
  77
  78         public function clear()
  79         {
  80                 return true;
  81         }
  82
  83         /**
  84          * @brief Sets a value if it's not already stored
  85          *
  86          * @param string $key      The cache key
  87          * @param mixed  $value    The old value we know from the cache
  88          * @param int    $ttl      The cache lifespan, must be one of the Cache constants
  89          * @return bool
  90          */
  91         public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
  92         {
  93                 $cachekey = $this->getCacheKey($key);
  94                 return $this->memcached->add($cachekey, $value, $ttl);
  95         }
  96 }