private void OnStateVariableChanged(DvStateVariable variable)
{
lock (_serverData.SyncObj)
{
// Unicast event notifications
DvService service = variable.ParentService;
foreach (EndpointConfiguration config in _serverData.UPnPEndPoints)
{
foreach (EventSubscription subscription in config.EventSubscriptions)
{
if (subscription.Service == service && !subscription.IsDisposed)
{
subscription.StateVariableChanged(variable);
}
}
}
// Multicast event notifications
if (variable.Multicast)
{
EventingState eventingState = _serverData.GetMulticastEventKey(variable.ParentService);
if (eventingState.EventKey == 0)
{
// Avoid sending "normal" change events before the initial event was sent
return;
}
eventingState.ModerateChangeEvent(variable);
ScheduleMulticastEvents();
}
}
}
protected void SendMulticastEventNotification(DvService service, IEnumerable <DvStateVariable> variables)
{
DvDevice device = service.ParentDevice;
EventingState eventingState = _serverData.GetMulticastEventKey(service);
// First cluster variables by multicast event level so we can put variables of the same event level into a single message
IDictionary <string, ICollection <DvStateVariable> > variablesByLevel =
new Dictionary <string, ICollection <DvStateVariable> >();
foreach (DvStateVariable variable in variables)
{
ICollection <DvStateVariable> variablesCollection;
if (!variablesByLevel.TryGetValue(variable.MulticastEventLevel, out variablesCollection))
{
variablesByLevel[variable.MulticastEventLevel] = variablesCollection = new List <DvStateVariable>();
}
variablesCollection.Add(variable);
}
foreach (KeyValuePair <string, ICollection <DvStateVariable> > varByLevel in variablesByLevel)
{
// Use a maximum cluster size of GENA_MAX_MULTICAST_EVENT_VAR_COUNT to keep UDP message small
ICollection <IList <DvStateVariable> > variableClusters = CollectionUtils.Cluster(
varByLevel.Value, UPnPConsts.GENA_MAX_MULTICAST_EVENT_VAR_COUNT);
foreach (IList <DvStateVariable> cluster in variableClusters)
{
foreach (DvStateVariable variable in cluster)
{
eventingState.UpdateModerationData(variable);
}
eventingState.IncEventKey();
byte[] bodyData = UPnPConsts.UTF8_NO_BOM.GetBytes(GENAMessageBuilder.BuildEventNotificationMessage(
cluster, false)); // Albert TODO: Is it correct not to force the simple string equivalent for extended data types here?
SimpleHTTPRequest request = new SimpleHTTPRequest("NOTIFY", "*");
request.SetHeader("CONTENT-LENGTH", bodyData.Length.ToString());
request.SetHeader("CONTENT-TYPE", "text/xml; charset=\"utf-8\"");
request.SetHeader("USN", device.UDN + "::" + service.ServiceTypeVersion_URN);
request.SetHeader("SVCID", service.ServiceId);
request.SetHeader("NT", "upnp:event");
request.SetHeader("NTS", "upnp:propchange");
request.SetHeader("SEQ", eventingState.EventKey.ToString());
request.SetHeader("LVL", varByLevel.Key);
request.SetHeader("BOOTID.UPNP.ORG", _serverData.BootId.ToString());
foreach (EndpointConfiguration config in _serverData.UPnPEndPoints)
{
IPEndPoint ep = new IPEndPoint(config.GENAMulticastAddress, UPnPConsts.GENA_MULTICAST_PORT);
request.SetHeader("HOST", NetworkHelper.IPEndPointToString(ep));
request.MessageBody = bodyData;
byte[] bytes = request.Encode();
NetworkHelper.SendData(config.GENA_UDP_Socket, ep, bytes, 1);
}
}
}
}
/// <summary>
/// Returns the event key for a multicast event for the given <paramref name="service"/> or <c>null</c>.
/// </summary>
public EventingState GetMulticastEventKey(DvService service)
{
EventingState result;
if (!ServiceMulticastEventingState.TryGetValue(service, out result))
ServiceMulticastEventingState[service] = result = new EventingState();
return result;
}