Subscription
The subscribe method (exposed through the NotificationProducer interface) allows consumers to register their interest in topics; using the method, it is also possible to set a subscription expiry time and a custom boolean filter. A subscription to a topic implies a subscription to all children of that topic in the topic space.
A useful feature of WS-BaseNotification is that the client calling subscribe can subscribe on behalf of the consumer - this is very useful in areas such as grid computing, where often subscriptions require specific privileges, but the service with that privilege wishes to defer processing to another service.
Read more about this topic: WS-Base Notification
Famous quotes containing the word subscription:
“The mode of founding a college is, commonly, to get up a subscription of dollars and cents, and then, following blindly the principles of a division of labor to its extreme,—a principle which should never be followed but with circumspection,—to call in a contractor who makes this a subject of speculation,... and for these oversights successive generations have to pay.”
—Henry David Thoreau (1817–1862)