COMET AND REVERSE AJAX: THE NEXT GENERATION AJAX 2.0 (Firstpress)

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The authors do an excellent job of illustrating the "Comet" process here: Keeping an HTTP request open so that the client can continue to receive content from the server continuously, rather than having to repeatedly query the server for Ajax content. They describe the advantages and potential pitfalls in a good amount of depth without becoming overly detailed for programmers working with a Java framework like Grails. They talk especially about DWR, a fine framework that takes care of the details of Comet and can be easily used in conjunction with other web frameworks.But before you invest in this book, you should be aware of two things: It's very short (like all of the Firstpress books) and only talks about DWR 2.0, while the cutting edge is DWR 3.0. Also, you should think about whether you really need Comet in order to do what you're doing; for most purposes, ordinary Ajax is fine. If you're trying to learn Comet in depth, the DWR documentation is a better resource. And if you're intent on learning Comet quickly, the eBook version of this book might be a better buy.