///<summary>
/// Notification that a new client session has been opened.
/// When the listener is registered, this will be called for all existing sessions. It will then be called
/// for every new session that opens whilst the listener is registered.
/// This will be called for every client session regardless of requested session properties.
/// </summary>
/// <param name="sessionId">The session identifier.</param><param name="properties">The map of requested
/// session property values. This can be empty if no properties were requested. If a requested property did
/// not exist then it will not be prsent in the map.</param>
public override void OnSessionOpen(SessionId sessionId, IDictionary <string, string> properties)
{
if ("Accounts".Equals(properties["Department"]) && "IT".Equals(properties["$Country"]))
{
_subscriptionControl.Subscribe(sessionId, _currentTopic, _subscriptionCallback);
}
}
/// <summary>
/// Subscribe a client to topics.
/// </summary>
/// <param name="sessionId">The session id of the client to subscribe.</param>
/// <param name="topicSelector">The topic selector expression.</param>
/// <param name="callback">The callback for the subscription result.</param>
public void Subscribe(SessionId sessionId, string topicSelector, ISubscriptionCallback callback)
{
// To subscribe a client to a topic, this client session must have the MODIFY_SESSION permission.
subscriptionControl.Subscribe(sessionId, topicSelector, callback);
}