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The role of the server
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documents as a series of undoable actions to be passed between client and server. We ll look at an implementation of this later in the chapter. This concludes our discussion of the server-side architectures of the day. None provides a perfect fit for Ajax yet, which is not surprising given that they were designed to serve a considerably different kind of web application. A lot of good work is underway to build Ajax into existing frameworks and the next year or so should prove interesting. Nonetheless, many web developers will be faced with the task of making Ajax work with these legacy systems, and this overview of the strengths and weaknesses for each ought to provide a starting point. Let s assume for the moment that we have decided upon one architecture or another and begun the work of developing an Ajax application. We have already discussed the architecture of the client application itself in detail in chapter 4, and we provided examples of retrieving XML data from the server in chapter 2. XML is popular but not the only way of exchanging data between client and server. In the following section, we review the full spectrum of options for communicating between client and server.
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5.4 The details: exchanging data
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We ve looked at the big architectural patterns that describe how our web application might behave and shown that there are many options. We ve stressed the importance of communication between the client and the server s domain models, and we might naively assume that once we ve settled on a framework, our design choices are made for us. In this and the following section, we ll see that this is far from true. If we focus on a single exchange of data, we have many options. We ll catalog the options here, with the aim of developing a pattern language for Ajax data exchange. With this in hand, we can make more informed decisions about what techniques to use in particular circumstances. Exchanging pure data has no real analog in the classical web application, and so the pattern language is less well developed in this area. I ll attempt to fill that void by defining a few phrases of my own. As a first cut, I suggest that we break user interactions into four categories: client-only, content-centric, script-centric, and data-centric. Client-only interactions are simple, so we ll deal with them quickly in the next section, and then introduce an example that can see us through the other three.
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The details: exchanging data
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5.4.1 Client-only interactions
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A client-only interaction is one in which a user interaction is processed by a script that has already been loaded into the browser. No recourse to the web server (the old presentation tier) is necessary, which is good for responsiveness and for server load. Such an interaction is suitable for relatively trivial calculations, such as adding a sales tax or shipping charge to a customer s order. In general, for this approach to be effective, the client-side logic that processes the interaction needs to be small and unchanging during the lifetime of the customer interaction. In the case of shipping options, we are on safe ground because the number of options will be of the order of two to five, not several thousands (unlike, say, the full catalog of an online retailer), and the shipping costs are unlikely to change from one minute to the next (unlike, say, a stock ticker or first-come-first-served ticket-reservation system). This type of interaction has already been explored in chapter 4 s discussion of the client-side Controller, so we ll say no more about it here. The remaining three categories all involve a trip back to the server and differ primarily in what is fetched. The key differences are summarized in the following sections, along with the pros and cons of each.
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