The set of Subscription classes implements the functionality of subscription to messages. A class from the Subscription group is used to store messages of a specific type until they are requested by the recipient. You can use the functions of the set of Subscription classes to define the recipients of stored messages.
Subscription class keys are stored at the message endpoints of the message bus. If the message endpoint object that stores the class key is deleted, the corresponding subscription class is also deleted. Sending of messages defined by this class is stopped.
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