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<?php
/**
* The cache wrapper wraps a memory cache around another cache. This should
* reduce the accesses to the actual cache.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 5.4
*/
class StudipCacheWrapper implements StudipCache
{
const DEFAULT_MEMORY_EXPIRATION = 60;
protected $actual_cache;
protected $memory_cache;
public function __construct(StudipCache $actual_cache)
{
$this->actual_cache = $actual_cache;
$this->memory_cache = new StudipMemoryCache();
}
/**
* @inheritdoc
*/
public function expire($arg)
{
$this->memory_cache->expire($arg);
$this->actual_cache->expire($arg);
}
/**
* @inheritdoc
*/
public function flush()
{
$this->memory_cache->flush();
$this->actual_cache->flush();
}
/**
* @inheritdoc
*/
public function read($arg)
{
$cached = $this->memory_cache->read($arg);
if ($cached !== false) {
return $cached;
}
$cached = $this->actual_cache->read($arg);
if ($cached !== false) {
$this->memory_cache->write($arg, $cached, self::DEFAULT_MEMORY_EXPIRATION);
}
return $cached;
}
/**
* @inheritdoc
*/
public function write($name, $content, $expires = self::DEFAULT_EXPIRATION)
{
$this->memory_cache->expire($name);
$this->actual_cache->write($name, $content, $expires);
}
}
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