Description

Holds a set of subscriptions use by both TMQTTServers and TMQTTClients and performs set operations on these lists of subscriptions.

Clients can subscribe to topics either by creating TMQTTClientSubscription components and linking them to TMQTTClient, or by constructing a TMQTTSubscriptionList object and passing it to TMQTTClient.Subscribe()

Server sessions use TMQTTSubscriptionList to keep track of what topics each client is subscribed to.

Properties

Name	Visibility	Access	Description
Count	public	RO	The number of subscriptions in the Items[] property
Items[]	public	RO	An indexed array of TMQTTSubscription objects

Methods

Name	Visibility	Description
Assign	public	If Source is a TMQTTSubscriptionList object, then clear the list and copy the items from Source
Clear	public	Clears the list of subscriptions
Find	public	Find a subscription by Filter string. Returns nil if nothing found.
New	public	Factory method to create a new TMQTTSubscription object and add it to the list. Use this method to quickly construct a Subscription list.
Update	public	Find a subscription object with a matching Filter and replace it with the object provided. Free's the replaced object.
Remove	public	Remove a subscription from the list and free it from memory
Delete	public	Delete the subscription at the indexth position in the list and free it from memory
MergeList	public	Merge's another subscription list into this list without creating duplicates. If two subscriptions share the same Filter text then the existing one is replaced by the one provided.
DeleteList	public	Delete's a list of subscriptions from this subscription list. Any subscription with a matching Filter are removed and destroyed.
RemoveDuplicates	public	Removes duplicate subscriptions, preserving the copy with the highes QoS value. Must be called after RemoveInvalidSubscriptions. Returns the number of duplicate subscriptions removed.
RemoveInvalidSubscriptions	public	Remove any subscription that could not be parsed into tokens by the TMQTTTokenizer or that contain invalid tokens according to the MQTT specifications. Returns the number of invalid subscriptions removed.