/// <summary>
/// Removes a client from the memebership list.
/// </summary>
/// <param name="client">The client to remove.</param>
/// <returns>The current membership.</returns>
public void Unsubscribe(IMqttSender client, SubscriptionInterest interest)
{
lock (this)
{
// Remove from the membership
if (interest.HasFlag(SubscriptionInterest.Messages) && ArrayUtils.Remove(ref this.MessageSubscribers, client) >= 0)
{
// Remove the client from the presence
if (client.Id != ConnectionId.Empty)
{
Console.WriteLine("Removing from presence: " + client.Id);
this.Presence.Remove(client.Id.ToString());
}
if (this.Listeners == 0)
{
// Broadcast unsubscribe if there's no more clients left
this.BroadcastUnsubscribe(client);
}
}
if (interest.HasFlag(SubscriptionInterest.Presence))
{
// Unregister the client presence as well
ArrayUtils.Remove(ref this.PresenceSubscribers, client);
}
// Dispose the subscription if empty
if (this.Empty)
{
this.Dispose();
}
}
}
/// <summary>
/// Subscribes a client by adding it to an appropriate membership list.
/// </summary>
/// <param name="client">The client to subscribe.</param>
/// <param name="interest">The interests to register for.</param>
/// <returns></returns>
public void Subscribe(IMqttSender client, SubscriptionInterest interest)
{
lock (this)
{
if (interest.HasFlag(SubscriptionInterest.Messages))
{
// Add to the membership list
ArrayUtils.AddUnique(ref this.MessageSubscribers, client);
// Add to the presence. Since the presence is inside the registry, it will be automatically
// synchronized and eventually consistent across the cluster.
if (client.Id != ConnectionId.Empty)
{
this.Presence.Add(client.Id.ToString(), new SubscriptionPresenceInfo(client));
}
}
if (interest.HasFlag(SubscriptionInterest.Presence))
{
// Subscribe to presence events
ArrayUtils.AddUnique(ref this.PresenceSubscribers, client);
}
}
}