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<?php
/**
* Proxies a StudipCache and stores the expire operation in the database.
* These operations are lateron applied to the cache they should have
* been applied to in the beginning.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 3.3
*/
class StudipCacheProxy implements StudipCache
{
protected $actual_cache;
protected $proxy_these;
/**
* @param StudipCache $cache The actual cache object
* @param mixed $proxy_these List of operations to proxy (should be
* an array but a space seperated string
* is also valid)
*/
public function __construct(StudipCache $cache, $proxy_these = ['expire'])
{
if (!is_array($proxy_these)) {
$proxy_these = words($proxy_these);
}
$this->actual_cache = $cache;
$this->proxy_these = is_array($proxy_these)
? $proxy_these
: words($proxy_these);
}
/**
* Expires just a single key.
*
* @param string $key The item's key
*/
public function expire($key)
{
if (in_array('expire', $this->proxy_these)) {
try {
$operation = new StudipCacheOperation([$key, 'expire']);
$operation->parameters = serialize([]);
$operation->store();
} catch (Exception $e) {
}
}
return $this->actual_cache->expire($key);
}
/**
* Expire all items from the cache.
*/
public function flush()
{
if (in_array('flush', $this->proxy_these)) {
try {
$operation = new StudipCacheOperation(['', 'flush']);
$operation->parameters = serialize([]);
$operation->store();
} catch (Exception $e) {
}
}
return $this->actual_cache->flush();
}
/**
* Reads just a single key from the cache.
*
* @param string $key The item's key
* @return mixed The corresponding value
*/
public function read($key)
{
return $this->actual_cache->read($key);
}
/**
* Store data at the server.
*
* @param string $key The item's key
* @param string $content The item's conten
* @param int $expires The item's expiry time in seconds, defaults to 12h
* @return bool Returns TRUE on success or FALSE on failure
*/
public function write($key, $content, $expires = self::DEFAULT_EXPIRATION)
{
if (in_array('write', $this->proxy_these)) {
try {
$operation = new StudipCacheOperation([$key, 'write']);
$operation->parameters = serialize([$content, $expires]);
$operation->store();
} catch (Exception $e) {
}
}
return $this->actual_cache->write($key, $content, $expires);
}
}
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