
Interactive Websites with Comet and DWR
In this session filmed during QCon London 2008, Joe Walker presents Comet, a long polling AJAX method used for updating the browser’s page, and DWR, a Java library for writing web sites using AJAX.
Tracking change and innovation in the enterprise software development community

In this session filmed during QCon London 2008, Joe Walker presents Comet, a long polling AJAX method used for updating the browser’s page, and DWR, a Java library for writing web sites using AJAX.
Atmosphere which started off as an evolution of Grizzly, is a POJO based framework that aims to bring Comet to the masses. This Comet Abstraction Framework released its first alpha version and InfoQ had a Q&A with its creator Jean-Francois Arcand about it.
The Dojo Toolkit is a modular open source JavaScript library, designed to ease the rapid development of JavaScript or Ajax-based applications and web sites. InfoQ had a Q&A with Dylan Schiemann, CEO of SitePen and co-creator of the Dojo Toolkit, about AJAX, Comet, Bayeux, RIAs and the newly released Dojo Toolbox.
The Grizzly framework is used in multiples products like GlassFish, Sailfin, RESTlet, OpenESB and many more, where it enables developers to write scalable server applications, by leveraging the Java New I/O API (NIO). Atmosphere, an evolution of Grizzly, is a POJO based framework that aims to bring Comet to the masses. Jean-Francois talks to InfoQ about this new development.
Comet - technology that allows a sever to send over HTTP a message to the client when an event occurs, without the client having to explicitly request it - has been considered by some to scale poorly in the past. Recent tests using Cometd and Jetty as well as Lightstreamer production implementations prove the opposite.
The Extensible Messaging and Presence Protocol (XMPP) has proven itself as a winner for instant messaging, but could it also be the protocol of choice for service integration in the future?