public SubscriptionRegistration(Subscription subscription, ClientSession session)
{
if (subscription == null || session == null)
throw new ArgumentNullException();
this.subscription = subscription;
this.session = session;
}
private void SubscriptionUpdatedHandler(Subscription subscription)
{
if (!UserIsLoggedIn) return;
if (!subscriptions.ContainsKey(subscription.Guid)) return;
if (subscription.Status == SubscriptionStatus.Unknown || subscription.Status == SubscriptionStatus.Stopped)
{
//termination
if (subscriptions_callbacks[subscription.Guid] != null)
subscriptions_callbacks[subscription.Guid](subscription, null);
subscriptions_mutex.WaitOne();
subscriptions.Remove(subscription.Guid);
subscriptions_callbacks.Remove(subscription.Guid);
subscriptions_mutex.ReleaseMutex();
}
else
{
//update
subscriptions[subscription.Guid] = subscription;
if (subscriptions_callbacks[subscription.Guid] != null)
subscriptions_callbacks[subscription.Guid](subscription, null);
}
}
public Subscription Subscribe(Guid device, short service, ClientSession session)
{
if (session == null) return null;
if (device == Guid.Empty) return null;
if (service == 0) return null;
if (DeviceManager.Instance.Get(device) == null) return null;
if (DeviceManager.Instance.Get(device).Status != DeviceStatus.Online
&& DeviceManager.Instance.Get(device).Status != DeviceStatus.Paused) return null;
// Check for permission
if (!session.UserHasPermission(User.PERMISSION_SUBSCRIBE)) return null;
// thread safe
mutex.WaitOne();
// make sure we don't have duplicates
foreach (SubscriptionRegistration registration in registrations.Values)
if (registration.Session == session &&
registration.Subscription.Device == device)
{
mutex.ReleaseMutex();
//update service mask
registration.Subscription.Service = service;
return registration.Subscription;
}
// generates a new guid
Guid guid;
while (true)
{
guid = Guid.NewGuid();
if (!registrations.ContainsKey(guid))
break;
}
// create the object
Subscription subscription = new Subscription { Guid = guid, Device = device, Service = service, Status = SubscriptionStatus.Unknown };
SubscriptionRegistration reg = new SubscriptionRegistration(subscription, session);
if (DeviceManager.Instance.Get(device).Status == DeviceStatus.Online)
reg.SetStatus(SubscriptionStatus.Running);
else
reg.SetStatus(SubscriptionStatus.Paused);
// add to registry
registrations.Add(guid, reg);
Util.EventLog.WriteEntry(guid.ToString(), "Subscription Started, Count = " + registrations.Count);
mutex.ReleaseMutex();
return subscription;
}
