118 lines
2.5 KiB
PHP
118 lines
2.5 KiB
PHP
<?php
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namespace Friendica\Core\Cache;
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use Friendica\Core\Cache;
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use Exception;
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use Memcached;
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/**
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* Memcached Cache Driver
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*
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* @author Hypolite Petovan <mrpetovan@gmail.com>
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*/
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class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
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{
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use TraitCompareSet;
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use TraitCompareDelete;
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/**
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* @var \Memcached
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*/
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private $memcached;
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/**
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* Due to limitations of the INI format, the expected configuration for Memcached servers is the following:
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* array {
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* 0 => "hostname, port(, weight)",
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* 1 => ...
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* }
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*
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* @param array $memcached_hosts
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* @throws \Exception
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*/
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public function __construct(array $memcached_hosts)
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{
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if (!class_exists('Memcached', false)) {
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throw new Exception('Memcached class isn\'t available');
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}
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$this->memcached = new Memcached();
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array_walk($memcached_hosts, function (&$value) {
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$value = array_map('trim', explode(',', $value));
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});
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$this->memcached->addServers($memcached_hosts);
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if (count($this->memcached->getServerList()) == 0) {
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throw new Exception('Expected Memcached servers aren\'t available, config:' . var_export($memcached_hosts, true));
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}
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}
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public function get($key)
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{
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$return = null;
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$cachekey = $this->getCacheKey($key);
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// We fetch with the hostname as key to avoid problems with other applications
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$value = $this->memcached->get($cachekey);
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if ($this->memcached->getResultCode() === Memcached::RES_SUCCESS) {
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$return = $value;
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}
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return $return;
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}
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public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
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{
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$cachekey = $this->getCacheKey($key);
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// We store with the hostname as key to avoid problems with other applications
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if ($ttl > 0) {
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return $this->memcached->set(
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$cachekey,
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$value,
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$ttl
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);
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} else {
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return $this->memcached->set(
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$cachekey,
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$value
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);
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}
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}
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public function delete($key)
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{
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$cachekey = $this->getCacheKey($key);
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return $this->memcached->delete($cachekey);
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}
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public function clear($outdated = true)
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{
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if ($outdated) {
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return true;
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} else {
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return $this->memcached->flush();
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}
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}
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/**
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* @brief Sets a value if it's not already stored
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*
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* @param string $key The cache key
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* @param mixed $value The old value we know from the cache
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* @param int $ttl The cache lifespan, must be one of the Cache constants
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* @return bool
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*/
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public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
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{
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$cachekey = $this->getCacheKey($key);
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return $this->memcached->add($cachekey, $value, $ttl);
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}
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}
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