Distributed messaging system supporting stateful subscriptions
US8533742B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2008 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | Nov 9, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L67/565
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A distributed messaging system supporting stateful subscriptions is provided. A stateful publish-subscribe system extends the functionality of the content-based approach to include more general state-valued expressions. Stateful subscriptions may refer to one or more message histories and may include more complex expressions. Therefore, subscribers may receive different information than that provided in the published messages. A plurality of broker machines is provided to deliver messages sent by publishing clients toward subscribing clients based upon the contents of the messages and stateful transformations requested by the subscribing clients. Subscription specifications are analyzed by a compiler and converted into a collection of transform objects and view objects. The messaging system builds a structure containing all transform objects and view objects needed for all intermediate and subscribed views of all subscriptions. This messaging system uses this structure to allocate transform objects and view objects to broker machines in the overlay network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.