Method register

/**
 * Register a logger
 *
 * @param   string   $key      The service key to be registered
 * @param   string   $class    The class name of the logger
 * @param   boolean  $replace  Flag indicating the service key may replace an existing definition
 *
 * @return  void
 *
 * @since   4.0.0
 */
public function register(string $key, string $class, bool $replace = false)
{
    // If the key exists already and we aren't instructed to replace existing services, bail early
    if (isset($this->loggerMap[$key]) && !$replace) {
        throw new \RuntimeException("The '{$key}' key is already registered.");
    }
    // The class must exist
    if (!class_exists($class)) {
        throw new \RuntimeException("The '{$class}' class for key '{$key}' does not exist.");
    }
    $this->loggerMap[$key] = $class;
}