Alex Russell, who works at JotSpot and did the DOJO Toolkit for JavaScript is talking about Comet and low latency data to and from browsers .
Tutorial Details:
The goal is responsiveness. AJAX gives you half the answer. AJAX is about me. Social applications are driven by others—the multiuser web. How do we send the datagrams that users make to each other. To any one user, the server represents the other users. Because the Web is a multiuser experience, single interaction updates aren’t enough. Users in the same “space” need live updates of their own changes and the changes others make. Updates to content affect available actions. Stake context may mean the wrong decision.
If the Web is a conversation, then stale context kills. When you create a page, or tag a picture, or something else, you’re chaining context. Conversation mediums are defined by latency, interrupt, and bandwidth. He gives some examples (in order of latency): snail-mail, email, IRC, SMS, IM, phone, and finally face-to-face.
Polite users use high-interruption mediums as infrequently as possible. Traditional wikis are fraught with usability issues.
Wikis are conversation enablers that are traditionally medium-to-high latency and not well suited to high volume changes. There are locking issues. AJAX allows more context to go stale.Conversations are ordered events. Granular interfaces require granular events. Granular conversations are more immediate (IM vs. email). Social applications are even busses. Social web apps just batch changes today. The are no effective was to “subscribe” to server events today. To fix the context, we need to syndicate the events.
Event broadcast requires synchronization. Comet is a technique for pushing data from the server. New term, but old tech. This is enabled by long-lived HTTP connections instead of polling. There are similarities to AJAX: no new plugins, plain-old HTTP, asynchronous, broad browser support.
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