/**
* Creates a cache config instance with the ability to write if required.
*
* @param bool $writer Unused.
* @return cache_config_disabled|cache_config_writer
*/
public function create_config_instance($writer = false)
{
// We are always going to use the cache_config_disabled class for all regular request.
// However if the code has requested the writer then likely something is changing and
// we're going to need to interact with the config.php file.
// In this case we will still use the cache_config_writer.
$class = 'cache_config_disabled';
if ($writer) {
// If the writer was requested then something is changing.
$class = 'cache_config_writer';
}
if (!array_key_exists($class, $this->configs)) {
self::set_state(self::STATE_INITIALISING);
if ($class === 'cache_config_disabled') {
$configuration = $class::create_default_configuration();
} else {
$configuration = false;
if (!cache_config::config_file_exists()) {
cache_config_writer::create_default_configuration(true);
}
}
$this->configs[$class] = new $class();
$this->configs[$class]->load($configuration);
}
self::set_state(self::STATE_READY);
// Return the instance.
return $this->configs[$class];
}
