semweb2slide53
From CommerceNet Wiki
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PubSub.com tracks over 12 million sources, primarily blogs and news feeds. Users subscribe to topics of interest, and receive IM alerts as soon as items of interest are published.
How do these real-time search and alerting services work? Several major blogging tools ping a trackback cloud when new items are posted. Technorati and PubSub.com monitor this cloud and use the postings to update their databases and alert users. While perhaps adequate for tracking blogs, which change relatively slowly, such a centralized pubsub service does not scale.
An Internet-scale event bus must accommodate potentially billions of agents publishing and subscribing in near real-time (100 milliseconds to a few seconds) to each other’s information and events. And it must route information intelligently. In the example shown, a supply chain manager is likely to be interested in all airports, not just Heathrow. But only for events that could interrupt his supply chain - a fire or strike for example, but not the appointment of a new landscaping contractor. And once notified, he doesn’t need 20 more messages from other news sources on the same event. Such a notification service requires a federated peer-to-peer architecture and intelligent agents that can filter and route content using rich ontologies and context, not just keywords.
