/// <summary>
/// Gets a connection string for these credentials.
/// </summary>
/// <returns>Connection string for this credentials set.</returns>
public async Task <string> GetConnectionStringAsync()
{
if (_credentials.IsExpired)
{
try
{
await _semaphore.WaitAsync();
if (_credentials.IsExpired)
{
var credentials = await _refreshCredentials();
_connectionString = _createConnectionString(_connectionString, credentials);
_credentials = credentials;
}
}
finally
{
_semaphore.Release();
}
}
return(_connectionString);
}
/// <summary> /// Produces a connection string using the new credentials. /// </summary> /// <param name="connectionString">The original connection string.</param> /// <param name="credentials">The new credentials to use.</param> /// <returns> /// A new connection string. /// </returns> protected abstract string WithNewCredentials(string connectionString, ExpiringCredentials credentials);