public SubscriptionRegistration(Subscription subscription, ClientSession session)
{
if (subscription == null || session == null)
throw new ArgumentNullException();
this.subscription = subscription;
this.session = session;
}
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;
}
/// <summary>
/// Create a new session
/// </summary>
/// <returns></returns>
public static ClientSession Create()
{
mutex.WaitOne();
while (true)
{
Guid id = Guid.NewGuid();
if (!sessions.ContainsKey(id))
{
ClientSession session = new ClientSession();
session.id = id;
sessions.Add(id, session);
Util.EventLog.WriteEntry(id.ToString(), "ClientSession Started, Count = " + sessions.Count);
mutex.ReleaseMutex();
return session;
}
}
}
public void UnsubscribeAll(ClientSession session)
{
if (session == null) return;
// thread safe
mutex.WaitOne();
foreach (SubscriptionRegistration registration in registrations.Values)
if (registration.Session == session)
registration.SetStatus(SubscriptionStatus.Stopped);
mutex.ReleaseMutex();
CleanUp();
}
public void Unsubscribe(Guid subscription, ClientSession session)
{
if (session == null) return;
// thread safe
mutex.WaitOne();
if (registrations.ContainsKey(subscription))
if(registrations[subscription].Session == session)
registrations.Remove(subscription);
mutex.ReleaseMutex();
}
