/// <summary>
/// Remove a subscriber for a topic
/// </summary>
/// <param name="topic">Topic for unsubscription</param>
/// <param name="client">Client to unsubscribe</param>
public void Unsubscribe(string topic, MqttClient client)
{
string topicReplaced = topic.Replace(PLUS_WILDCARD, PLUS_WILDCARD_REPLACE).Replace(SHARP_WILDCARD, SHARP_WILDCARD_REPLACE);
lock (this.subscribers)
{
// if the topic exists
if (this.subscribers.ContainsKey(topicReplaced))
{
// query for check client subscribed
var query = from s in this.subscribers[topicReplaced]
where s.ClientId == client.ClientId
select s;
// if the client is subscribed for the topic
if (query.Count() > 0)
{
MqttSubscription subscription = query.First();
// remove subscription from the list for the topic
this.subscribers[topicReplaced].Remove(subscription);
// dispose subscription
subscription.Dispose();
// remove topic if there aren't subscribers
if (this.subscribers[topicReplaced].Count == 0)
{
this.subscribers.Remove(topicReplaced);
}
}
}
}
}
/// <summary>
/// Remove a subscriber for all topics
/// </summary>
/// <param name="client">Client to unsubscribe</param>
public void Unsubscribe(MqttClient client)
{
lock (this.subscribers)
{
List <string> topicToRemove = new List <string>();
foreach (string topic in this.subscribers.Keys)
{
// query for check client subscribed
var query = from s in this.subscribers[topic]
where s.ClientId == client.ClientId
select s;
// if the client is subscribed for the topic
if (query.Count() > 0)
{
MqttSubscription subscription = query.First();
// remove subscription from the list for the topic
this.subscribers[topic].Remove(subscription);
// dispose subscription
subscription.Dispose();
// add topic to remove list if there aren't subscribers
if (this.subscribers[topic].Count == 0)
{
topicToRemove.Add(topic);
}
}
}
// remove topic without subscribers
// loop needed to avoid exception on modify collection inside previous loop
foreach (string topic in topicToRemove)
{
this.subscribers.Remove(topic);
}
}
}
