/**
* Constructs a new cache instance.
*
* You should not call this method from your code, instead you should use the cache::make methods.
*
* This method is public so that the cache_factory is able to instantiate cache instances.
* Ideally we would make this method protected and expose its construction to the factory method internally somehow.
* The factory class is responsible for this in order to centralise the storage of instances once created. This way if needed
* we can force a reset of the cache API (used during unit testing).
*
* @param cache_definition $definition The definition for the cache instance.
* @param cache_store $store The store that cache should use.
* @param cache_loader|cache_data_source $loader The next loader in the chain or the data source if there is one and there
* are no other cache_loaders in the chain.
*/
public function __construct(cache_definition $definition, cache_store $store, $loader = null)
{
global $CFG;
$this->definition = $definition;
$this->store = $store;
$this->storetype = get_class($store);
$this->perfdebug = !empty($CFG->perfdebug);
if ($loader instanceof cache_loader) {
$this->loader = $loader;
// Mark the loader as a sub (chained) loader.
$this->loader->set_is_sub_loader(true);
} else {
if ($loader instanceof cache_data_source) {
$this->datasource = $loader;
}
}
$this->definition->generate_definition_hash();
$this->staticacceleration = $this->definition->use_static_acceleration();
if ($this->staticacceleration) {
$this->staticaccelerationsize = $this->definition->get_static_acceleration_size();
}
$this->hasattl = $this->definition->get_ttl() > 0;
}
