.apache.org/qpid/qmfv2-api-proposal.html>QMF2 API Proposal
SUBSCRIBE_REQUEST: The SUBSCRIBE_REQUEST WorkItem provides a query that the agent application must periodically publish until the subscription is cancelled or expires. On receipt of this WorkItem, the application should call the Agent subscriptionResponse() method to acknowledge the request. On each publish interval, the application should call Agent subscriptionIndicate(), passing a list of the objects that satisfy the query. The subscription remains in effect until an UNSUBSCRIBE_REQUEST WorkItem for the subscription is received, or the subscription expires. The getParams() method of a QUERY WorkItem will return an instance of the SubscriptionParams class. The getHandle() WorkItem method returns the reply handle which should be passed to the Agent's subscriptionResponse() method.
@author Fraser Adams