protected override bool Receive(object message)
{
var resolve = message as Dns.Resolve;
if (resolve != null)
{
var answer = _cache.Cached(resolve.Name);
if (answer == null)
{
try
{
//TODO: IP6
answer = Dns.Resolved.Create(resolve.Name, System.Net.Dns.GetHostEntry(resolve.Name).AddressList.Where(x => x.AddressFamily == AddressFamily.InterNetwork));
_cache.Put(answer, _positiveTtl);
}
catch (SocketException ex)
{
if (ex.SocketErrorCode != SocketError.HostNotFound)
{
throw;
}
answer = new Dns.Resolved(resolve.Name, Enumerable.Empty <IPAddress>(), Enumerable.Empty <IPAddress>());
_cache.Put(answer, _negativeTtl);
}
}
Sender.Tell(answer);
return(true);
}
return(false);
}
public Cache Put(Dns.Resolved answer, long ttl)
{
var until = _clock() + ttl;
_queue.Add(new ExpiryEntry(answer.Name, until));
_cache.Add(answer.Name, new CacheEntry(answer, until));
return(this);
}
/// <summary>
/// TBD
/// </summary>
/// <param name="r">TBD</param>
/// <param name="ttl">TBD</param>
/// <returns>TBD</returns>
internal void Put(Dns.Resolved r, long ttl)
{
var c = _cache.Value;
if (!_cache.CompareAndSet(c, c.Put(r, ttl)))
{
Put(r, ttl);
}
}
public Cache Put(Dns.Resolved answer, long ttl)
{
var until = _clock() + ttl;
var cache = new Dictionary <string, CacheEntry>(_cache);
cache[answer.Name] = new CacheEntry(answer, until);
return(new Cache(
queue: new SortedSet <ExpiryEntry>(_queue, new ExpiryEntryComparer())
{
new ExpiryEntry(answer.Name, until)
},
cache: cache,
clock: _clock));
}
public CacheEntry(Dns.Resolved answer, long until)
{
Answer = answer;
Until = until;
}