public void AddQuestion(Question question)
{
questions.Add(question);
}
public void AddQuestion(Question question)
{
questions.Add(question);
}
private Response FindResponse(Question question)
{
if (!Options.UseCache)
{
return null;
}
Response response;
var key = GetQuestionKey(question);
lock (m_responses)
{
var result = m_responses.TryGetValue(key, out response);
if (!result)
{
return null;
}
}
var timeAlive = (int)((DateTime.Now.Ticks - response.TimeStamp.Ticks) / TimeSpan.TicksPerSecond);
foreach (var rr in response.ResourceRecords)
{
rr.TimeLived = timeAlive;
if (rr.TTL == 0)
{
return null;
}
}
return response;
}
public Response Query(string hostName, QType type, QClass @class)
{
if (String.IsNullOrWhiteSpace(hostName))
{
throw new ArgumentException("Invalid host name", "hostName");
}
var question = new Question(hostName, type, @class);
var response = FindResponse(question);
if (response != null)
{
return response;
}
var request = new Request();
request.AddQuestion(question);
response = GetResponse(request);
return response;
}
private static string GetQuestionKey(Question question)
{
var result = String.Format(
CultureInfo.InvariantCulture,
"{0}-{1}-{2}",
question.QClass,
question.QType,
question.QName);
return result;
}
