/**
* Parses the key turning it into a string (or array is required) suitable to be passed to the cache store.
*
* @param string|int $key As passed to get|set|delete etc.
* @return string|array String unless the store supports multi-identifiers in which case an array if returned.
*/
protected function parse_key($key)
{
// First up if the store supports multiple keys we'll go with that.
if ($this->store->supports_multiple_identifiers()) {
$result = $this->definition->generate_multi_key_parts();
$result['key'] = $key;
return $result;
}
// If not we need to generate a hash and to for that we use the cache_helper.
return cache_helper::hash_key($key, $this->definition);
}
/**
* Initialises the cache.
*
* Once this has been done the cache is all set to be used.
*
* @param cache_definition $definition
*/
public function initialise(cache_definition $definition)
{
$keyarray = $definition->generate_multi_key_parts();
$this->storeid = $keyarray['mode'] . '/' . $keyarray['component'] . '/' . $keyarray['area'] . '/' . $keyarray['siteidentifier'];
$this->store =& self::register_store_id($this->storeid);
$maxsize = $definition->get_maxsize();
$this->simpledata = $definition->uses_simple_data();
if ($maxsize !== null) {
// Must be a positive int.
$this->maxsize = abs((int) $maxsize);
$this->storecount = count($this->store);
}
}