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logic must be applied to that data at least once. Why at least Well, in most applications, some of the business logic is applied more than once. For example, a validation rule applied in the Presentation layer can be reapplied in the UI layer or Business Logic layer before data is sent to the database for storage. In some cases, the database will include code to recheck the value as well. Now, I d like to look at some of the more common options. I ll start with three popular (but flawed) approaches. Then I ll discuss a compromise solution that s enabled through the use of mobile objects; such as the ones supported by the framework I ll create later in the book.

In theory, you could use JavaScript to add important content to a web page. However, that would be a very bad idea, because there would be no room for graceful degradation. Visitors lacking the necessary JavaScript support would never see the content. At the time of writing, that includes searchbots. If you find yourself using the DOM to insert important content into a web page, you should probably reexamine your process. You may find that you are using the DOM inappropriately. As discussed in 5, you should always consider two issues associated with JavaScript: Progressive enhancement: The principle of progressive enhancement is based on the idea that you should begin with your core content. The content is structured using markup. The marked-up content is then enhanced. The enhancement might be stylistic, using CSS, or it might be behavioral, using DOM scripting. If you are adding core content with the DOM, you are adding it too late. The content should be part of the initial document. Graceful degradation: The corollary to progressive enhancement is graceful degradation. If you have progressively enhanced your content, then it follows that your stylistic and behavioral enhancements will degrade gracefully. Visitors to your website who lack the means to benefit from your CSS and DOM scripting will still be able to get to your core content. If you add important content using JavaScript, it won t degrade gracefully no JavaScript, no content. This may seem like a restriction, but it isn t. There are plenty of other uses for generating content with the DOM.

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Figure 1-9 illustrates common locations for validation and manipulation business logic in a typical application. Most applications have the same logic in at least a couple of these locations.

For the next example, we turn to a traditional application area for functional programming: describing digital hardware circuits and symbolically verifying their properties. We assume a passing familiarity with hardware design, but if you haven t looked inside a microprocessor chip for some time, a brief recap is included in the About Hardware Design sidebar. In this example, you will model circuits by propositional logic, a simple and familiar symbolic language made up of constructs such as AND, OR, NOT, and TRUE/FALSE values. You then implement an analysis that converts propositional logic formulae into a canonical form called binary decision diagrams (BDDs). Converting to a canonical form allows you to check conditions and properties associated with the digital circuits.

Business logic is put in a Web Presentation layer to give the user a more interactive experience and put into a Windows UI for the same reason. The business logic is rechecked in the web UI (on the web server) because the browser isn t trustworthy. And database administrators put the logic into the database (via stored procedures and other database constructs) because they don t trust any application developers! The result of all this validation is a lot of duplicated code, all of which has to be debugged, maintained, and somehow kept in sync as the business needs (and thus logic) change over time. In the real world, the logic is almost never really kept in sync, and so developers must constantly debug and maintain the code in a near-futile effort to make all of these redundant bits of logic agree with each other. One solution is to force all of the logic into a single layer, thereby making the other layers as dumb as possible. There are various approaches to this, although (as you ll see) none of them provide an optimal solution.

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