private void OnReceive(IAsyncResult ar) { lock (this) { int length; try { if (_socket == null) { return; } length = _socket.EndReceive(ar); } catch (Exception) { return; } try { var stream = new MemoryStream(_buffer, 0, length, false, true); Announcement announcement = ReadAnnouncement(stream); if (announcement.Type == Announcement.MessageType.Announcement) { SapClient.OnSessionAnnounce(this, announcement); } else { announcement.Decompress(); string origin = Encoding.UTF8.GetString(announcement.Payload.Array, announcement.Payload.Offset + 2, announcement.Payload.Count - 4); SapClient.OnSessionDelete(this, Origin.Parse(origin)); } } catch (Exception e) { SapClient.OnException(e); } StartReceive(); } }
internal void OnSessionAnnounce(NetworkInterfaceHandler interfaceHandler, Announcement announcement) { lock (_sessionData) { AnnouncementIdentifier id = new AnnouncementIdentifier(interfaceHandler.NetworkInterface, announcement); SessionData sessionData = null; bool knownAnnouncement = _announcements.TryGetValue(id, out sessionData); if (!knownAnnouncement) { announcement.Decompress(); Stream stream = new MemoryStream(announcement.Payload.Array, announcement.Payload.Offset, announcement.Payload.Count); SessionDescription description = SessionDescription.Load(stream); description.SetReadOnly(); SdpSession session = new SdpSession(description, interfaceHandler.NetworkInterface); SessionAnnouncement sessionAnnouncement = null; if (_sessionData.TryGetValue(session, out sessionData)) { sessionAnnouncement = sessionData.Session; } if (sessionData != null) { if (description.IsUpdateOf(sessionAnnouncement.SessionDescription)) { sessionAnnouncement = new SessionAnnouncement(description, interfaceHandler.NetworkInterface); SessionAnnouncement oldAnnouncement = sessionData.Session; sessionData.Session = sessionAnnouncement; _announcements.Remove(sessionData.Id); sessionData.Id = id; SynchronizationContextPost(o => { lock (Sessions) { Sessions.Replace(oldAnnouncement, sessionAnnouncement); } }); } } else { sessionAnnouncement = new SessionAnnouncement(description, interfaceHandler.NetworkInterface); sessionData = new SessionData() { Session = sessionAnnouncement, Timer = new Timer(OnTimeOut, session, System.Threading.Timeout.Infinite, System.Threading.Timeout.Infinite), Id = id }; _sessionData.Add(session, sessionData); _announcements.Add(id, sessionData); SynchronizationContextPost(o => { lock (Sessions) { Sessions.Add(sessionAnnouncement); } }); } } sessionData.TimeOutTime = DateTime.Now + DefaultTimeOut; sessionData.Timer.Change(DefaultTimeOut, TimeSpan.FromMilliseconds(-1)); } }