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

One of the main easy legislation of an internet software is that the buyer, no longer the server, needs to start up any communique among the 2. there are various common–use circumstances the place, preferably, the server wish to check with the client—dashboards and tracking apps, chat rooms and different collaborations, and growth studies on long–running tactics. Comet (a.k.a. opposite Ajax) offers a mechanism for permitting this. Comet is reasonably advanced to enforce. yet this functional, hands–on ebook will get you going.

  • In half 1 of this e-book, we begin via studying the use instances, and examine the easy choices to Comet and the way a ways they could fulfill your wishes. In a few events, although, basically Comet will do.
  • In half 2, we reveal the right way to arrange and run a Comet–based software.

With this e-book, join the subsequent new release, Ajax 2.0.

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Additional resources for Comet and Reverse Ajax: The Next-Generation Ajax 2.0

Example text

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. Anything not included in the allow element is protected, meaning that you don’t need to worry about accidentally exposing unintended functionality to hackers. Two elements are nested inside allow: create and convert. The create element is how we tell DWR to expose a class for remoting, and it has three attributes: creator, scope, and javascript.

The Cometd project is also hard at work creating interoperable server-side and client-side Comet libraries based on the Bayeux protocol. You can learn about Bayeux in Chapter 6. org/). DWR integrates Comet transparently into existing Java logic, allowing you to concentrate on simply writing your application functionality. It’s a great choice when you need to have Comet closely integrated with your application logic—a setup that DWR’s author Joe Walker calls onboard Comet. We’re going to use DWR to demonstrate how simply you can develop a Comet application when you don’t have to worry about all of the complexity under the hood.

You next enter a named while loop called checkChanges, which runs on a counter that will execute up to the maximum specified in the tries variable. Within this loop, you repeatedly hit a second method Comet and Reverse Ajax 43 called getChanges() and sleep for the specified time if no changes are encountered. If you do encounter changes, you render some JSON data and exit the loop. Finally, if you’ve used up all your tries and encountered nothing, you render an empty result set and exit the loop.

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