Method and system for event publication and subscription with an event channel from user level and kernel level

• US 20040153998A1
• Filed: 05/30/2003
• Published: 08/05/2004
• Est. Priority Date: 09/30/2002
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Mueller, Frank, McGuire, Cynthia A., Hoffman, Hans-Josef
• Granted Patent: US 7,107,497 B2
• Time in Patent Office: Days
• US Class Current: 717/128
• CPC Class Codes: G06F 2209/543 Local
• CPC Class Codes: G06F 9/542 Event management; Broadcasting; Multicasting; Notifications
• CPC Class Codes: G06F 9/545 where tasks reside in different layers, e.g. user- and kernel-space

Abstract

A method and system for event publication and subscription with an event channel from user level and kernel level are disclosed. The system comprises an event channel. The event channel includes an event queue for an event sent by a publisher. Additionally, the event channel has a plurality of subscriber-based queues each corresponding to a subscriber. If the corresponding subscriber has subscribed to receive delivery of the event, the subscriber-based queue includes the event. Moreover, the event channel further comprises a dispatcher for dispatching based on filtering criteria the event to the subscriber-based queue if the corresponding subscriber has subscribed to receive delivery of the event, and a delivery mechanism for delivering the event from the subscriber-based queue to the corresponding subscriber. The publisher can be a user level publisher or a kernel level publisher. The subscriber can be a user level subscriber or a kernel level subscriber.

Claims

1. A system comprising:

an event channel comprising

an event queue for an event sent by a publisher,

a plurality of subscriber-based queues each corresponding to a subscriber, wherein if said corresponding subscriber has subscribed to receive delivery of said event said subscriber-based queue includes said event,

a dispatcher for dispatching based on filtering criteria said event to said subscriber-based queue if said corresponding subscriber has subscribed to receive delivery of said event, and

a delivery mechanism for delivering said event from said subscriber-based queue to said corresponding subscriber.

2. The system as recited in claim 1 wherein said publisher is a user level publisher.

3. The system as recited in claim 1 wherein said publisher is a kernel level publisher.

4. The system as recited in claim 1 wherein said subscriber is a user level subscriber.

5. The system as recited in claim 1 wherein said subscriber is a kernel level subscriber.

6. The system as recited in claim 1 wherein said event is a user level event.

7. The system as recited in claim 1 wherein said event is a kernel level event.

8. A computer system comprising:

a user level environment;

a kernel level environment; and

a plurality of event channels operating in said kernel level environment, each event channel comprising

an event queue for an event sent by a publisher,

a plurality of subscriber-based queues each corresponding to a subscriber, wherein if said corresponding subscriber has subscribed to receive delivery of said event said subscriber-based queue includes said event,

a dispatcher for dispatching based on filtering criteria said event to said subscriber-based queue if said corresponding subscriber has subscribed to receive delivery of said event, and

a delivery mechanism for delivering said event from said subscriber-based queue to said corresponding subscriber.

9. The computer system as recited in claim 8 wherein said publisher is a user level publisher.

10. The computer system as recited in claim 8 wherein said publisher is a kernel level publisher.

11. The computer system as recited in claim 8 wherein said subscriber is a user level subscriber.

12. The computer system as recited in claim 8 wherein said subscriber is a kernel level subscriber.

13. The computer system as recited in claim 8 wherein said event is a user level event.

14. The computer system as recited in claim 8 wherein said event is a kernel level event.

15. A method of managing an event from a publisher to a subscriber, comprising:

sending said event to an event queue of an event channel from said publisher;

dispatching based on filtering criteria said event to a subscriber-based queue corresponding to said subscriber, wherein said subscriber has subscribed to receive delivery of said event; and

delivering said event to said subscriber from said subscriber-based queue.

16. The method as recited in claim 15 wherein said publisher is a user level publisher.

17. The method as recited in claim 15 wherein said publisher is a kernel level publisher.

18. The method as recited in claim 15 wherein said subscriber is a user level subscriber.

19. The method as recited in claim 15 wherein said subscriber is a kernel level subscriber.

20. The method as recited in claim 15 wherein said event is a user level event.

21. The method as recited in claim 15 wherein said event is a kernel level event.