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or a while, web application development has been a little stagnant. Developing for the browser has offered the option of creating simple HTML interfaces that work on any browser or operating system, or taking advantage of specific browser functionality to add more dynamic behavior at the cost of vendor lock-in or non-portability. The former type of application was more suited to an Internet audience and the latter more common in the intranet where organizations typically control the desktop software. But things are changing for a variety of reasons. For one, browsers of all types now have more commonality in the standards that they implement than at any time in the past. Secondly, XMLHttpRequest was adopted as standard. Combined, they make cross-platform dynamic browser solutions a real possibility in the shape of Ajax: Asynchronous JavaScript and XML. With Ajax, you retrieve from the server only the data that you actually need, and you don t have to load a whole page, much of which might be the same as was fetched before. That means we can post and retrieve data to and from the server after the page has loaded. In the last 6 to 12 months, loads of toolkits, frameworks, utilities, and applications have sprung up, all based on Ajax. DWR (http://www.getahead.ltd.uk/dwr), which stands for Direct Web Remoting, is one such toolkit. It provides a bunch of commonly used functions that your web application will inevitably need anyway to be able to make use of Ajax, and therefore it saves you from a lot of typing. For all self-respecting coders, this is never a bad thing, of course.

In the previous section, you learned how to read the state from an input port in a continuous loop. If you want your application to wait for a key press, then using polling for that is not good practice; it s pedantic and not very efficient. For triggering a rising or falling edge of a pulse (see Figure 5-4), this approach is also unsuitable. Continuously reading a GPIO state will keep the processor busy and give it no idle time, so it can never go to low-power mode. Interrupt ports are the keys to solving this problem; the special class called InterruptPort extends the InputPort class. Interrupts are hardware events. If the microcontroller has nothing further to do than wait for a certain GPIO event, the processor can confidently go into powersaving mode. As soon as a signal change occurs at the input pin, the microcontroller wakes up and a certain method, the interrupt service routine (ISR), will be executed. You can configure an interrupt port to wait either for the rising edge of a pulse, falling edge of a pulse, both edges of a pulse, or for the high or low signal level in general (Figure 5-4 shows these).

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What does this all have to do with Spring MVC, you might be wondering. Well, not a great deal directly, but this is such a popular technology right now that we thought it would be interesting to include a few pages on how you might enhance your Spring web applications through the use of DWR. It would even be possible, if you really wanted to try, to replace the majority of MVC functionality with Ajax/DWR, but we feel that a blend of the two offers the most promise. DWR works, as the name suggests, by making server-side objects available to your clientside JavaScript functions. That means you have the ability to call methods on those objects from within your JavaScript functions and work with the results. DWR handles the conversion of the server-side objects by dynamically creating JavaScript objects that implement the same interface. When you call the methods on the JavaScript object, DWR proxies the call to the server and converts the returned object (if any).

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