private async Task RefreshSetting(string key)
{
//eliminate the before and after characters the ${ and the }
string newKey = key.Substring(2, key.Length - 3);
//split the string by the delimeter
string[] kvParameters = Regex.Split(newKey, __delimiter, RegexOptions.None);
//get the vault name from the element
string kvName = kvParameters[1];
//get the configuration section for this vault
KeyVaultConfigurationElement section = KeyVaultConfigurationSection.Instance.Vaults[kvName];
//create and instance of the settings class that translates between the config and the kv connector dll
KeyVaultSettings settings = new KeyVaultSettings(section);
//Use the settings to update this item in the cache
_kvItems.AddOrUpdate(key, await settings.GetSecret(kvParameters[2]), (thiskey, thisvalue) => thisvalue);
//And update the expiration time for this item
_expirations.AddOrUpdate(key, DateTime.Now.AddSeconds(RefreshFrequency), (thiskey, thisvalue) => thisvalue);
}
internal KeyVaultSettings(KeyVaultConfigurationElement section)
{
_section = section;
}
