/**
* Test if a cache is available or not (for the given id)
*
* @param string $id cache id
* @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
*/
public function test($id)
{
$fastTest = $this->_fastBackend->test($id);
if ($fastTest) {
return $fastTest;
} else {
return $this->_slowBackend->test($id);
}
}
/**
* Save some string datas into a cache record
*
* Note : $data is always "string" (serialization is done by the
* core not by the backend)
*
* @param string $data Datas to cache
* @param string $id Cache id
* @param array $tags Array of strings, the cache record will be tagged by each string entry
* @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
* @param int $priority integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
* @return boolean true if no problem
*/
public function save($data, $id, $tags = array(), $specificLifetime = false, $priority = 8)
{
$usage = $this->_getFastFillingPercentage('saving');
$boolFast = true;
$lifetime = $this->getLifetime($specificLifetime);
$preparedData = $this->_prepareData($data, $lifetime, $priority);
if ($priority > 0 && 10 * $priority >= $usage) {
$fastLifetime = $this->_getFastLifetime($lifetime, $priority);
$boolFast = $this->_fastBackend->save($preparedData, $id, array(), $fastLifetime);
$boolSlow = $this->_slowBackend->save($preparedData, $id, $tags, $lifetime);
} else {
$boolSlow = $this->_slowBackend->save($preparedData, $id, $tags, $lifetime);
if ($boolSlow === true) {
$boolFast = $this->_fastBackend->remove($id);
if (!$boolFast && !$this->_fastBackend->test($id)) {
// some backends return false on remove() even if the key never existed. (and it won't if fast is full)
// all we care about is that the key doesn't exist now
$boolFast = true;
}
}
}
return $boolFast && $boolSlow;
}
