Comet and Reverse Ajax: The Next-Generation Ajax 2.0 by By (author) Phil McCarthy By (author) Dave Crane

By By (author) Phil McCarthy By (author) Dave Crane

One of the main easy legislation of an internet program is that the buyer, now not the server, needs to start up any verbal exchange among the 2. there are many common–use situations the place, preferably, the server wish to consult the client—dashboards and tracking apps, chat rooms and different collaborations, and growth stories on long–running tactics. Comet (a.k.a. opposite Ajax) offers a mechanism for permitting this. Comet is reasonably advanced to enforce. yet this useful, hands–on publication will get you going.

  • In half 1 of this ebook, we commence by means of interpreting the use instances, and consider the straightforward possible choices to Comet and the way some distance they could fulfill your wishes. In a few occasions, even though, purely Comet will do.
  • In half 2, we show the best way to arrange and run a Comet–based software.

With this publication, be part of the following iteration, Ajax 2.0.

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Sample text

Along the way, you’ll see how Comet can improve your applications’ responsiveness, and you’ll discover a whole new set of issues. The examples that we present here are designed to illustrate the issues surrounding Comet. In this chapter, you’ll be replacing your polling/piggybacking mechanism with Comet and using it to update your domain model on the fly. First, though, we’re going to introduce a somewhat simpler feature that will allow you to come to grips with coding Comet on the client. Later, in Chapters 4 through 7, we’ll look at a couple of best of breed implementations—the dedicated support for Comet offered by DWR and Cometd/Bayeux.

The examples that we present here are designed to illustrate the issues surrounding Comet. In this chapter, you’ll be replacing your polling/piggybacking mechanism with Comet and using it to update your domain model on the fly. First, though, we’re going to introduce a somewhat simpler feature that will allow you to come to grips with coding Comet on the client. Later, in Chapters 4 through 7, we’ll look at a couple of best of breed implementations—the dedicated support for Comet offered by DWR and Cometd/Bayeux.

This cut-down version of the Magnetic Poetry example application you encountered earlier in this book simply allows Word objects to be stored and retrieved. findAll(); } } As you can see, there isn’t much to it. The Word class incorporates methods that deal with the persistence concerns here. It’s sufficient to know that we can either add a new Word object or retrieve all existing Word objects from the datastore. xml file. Word"/> Inside the top-level dwr element is an allow element that tells DWR explicitly what its remoting mechanism should permit access to.

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