/**
* Validates a cached item.
*
* Checks that items are either permanent or did not expire.
*/
protected function isValid($cache)
{
if (!isset($cache->data)) {
return FALSE;
}
// Check expire time.
$cache->valid = $cache->expire == Cache::PERMANENT || $cache->expire >= REQUEST_TIME;
// Make sure that cache tags were not expired.
if (!$this->checksumProvider->isValid($cache->checksum, $cache->tags)) {
$cache->valid = FALSE;
}
return $cache->valid;
}
/**
* Prepares a cached item.
*
* Checks that items are either permanent or did not expire, and returns data
* as appropriate.
*
* @param object $cache
* An item loaded from cache_get() or cache_get_multiple().
* @param bool $allow_invalid
* If FALSE, the method returns FALSE if the cache item is not valid.
*
* @return mixed
* The item with data as appropriate or FALSE if there is no
* valid item to load.
*/
protected function prepareItem($cache, $allow_invalid)
{
if (!isset($cache->data)) {
return FALSE;
}
// Check expire time.
$cache->valid = $cache->expire == Cache::PERMANENT || $cache->expire >= REQUEST_TIME;
// Check if invalidateTags() has been called with any of the item's tags.
if (!$this->checksumProvider->isValid($cache->checksum, $cache->tags)) {
$cache->valid = FALSE;
}
if (!$allow_invalid && !$cache->valid) {
return FALSE;
}
return $cache;
}
/**
* Prepares a cached item.
*
* Checks that items are either permanent or did not expire, and unserializes
* data as appropriate.
*
* @param object $cache
* An item loaded from cache_get() or cache_get_multiple().
* @param bool $allow_invalid
* If FALSE, the method returns FALSE if the cache item is not valid.
*
* @return mixed|false
* The item with data unserialized as appropriate and a property indicating
* whether the item is valid, or FALSE if there is no valid item to load.
*/
protected function prepareItem($cache, $allow_invalid)
{
if (!isset($cache->data)) {
return FALSE;
}
$cache->tags = $cache->tags ? explode(' ', $cache->tags) : array();
// Check expire time.
$cache->valid = $cache->expire == Cache::PERMANENT || $cache->expire >= REQUEST_TIME;
// Check if invalidateTags() has been called with any of the items's tags.
if (!$this->checksumProvider->isValid($cache->checksum, $cache->tags)) {
$cache->valid = FALSE;
}
if (!$allow_invalid && !$cache->valid) {
return FALSE;
}
// Unserialize and return the cached data.
if ($cache->serialized) {
$cache->data = unserialize($cache->data);
}
return $cache;
}
