Part IV ColdFusion MX Components, Web Services, and Flash Integration in Java

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Part IV ColdFusion MX Components, Web Services, and Flash Integration
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Advanced Component Concepts
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We like to tell the story of components, where we start with the simplest concepts and build up the topic with easily digestible layers of additional complexity. This teaching method works really well for components, because they are such a radical departure from traditional ColdFusion development concepts, and they offer lots of new concepts to master. We ve delayed talking about advanced concepts until the very end of this chapter, mainly because they are not absolutely critical to understanding and developing 90 percent of the components that you re likely to ever build. You could probably work until retirement building ColdFusion components and never need to employ any of the concepts in the following sections, but if you do take the time to understand and use them where warranted, your code takes on a more natural feel. And the more naturally that your code conforms to good design principles, the easier it is for others to understand and maintain it.
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Void functions
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In traditional terms, a function returns a single result to its caller. Code that simply goes out and does something to something else without returning a result is commonly known as a procedure. In ColdFusion terms, a tag is a procedure, and a function is . . . well, a function. The line between these two became somewhat blurred with the introduction of object-oriented languages, because the properties of an object are also known as data members, and the object s methods are also known as member functions. In fact, they re known as member functions even if they do not return a value; no such thing as a member procedure exists. Suddenly, functions didn t need to return results to their callers. To distinguish between normal functions and these new-style functions that don t return values, the term void function was coined. Basically, a void function is just a function that doesn t return a result. In the following code snippet, you call a getter that returns a string containing a zip code and then call a setter that sets the zip code to a new value:
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<cfscript> theZipCode = Session.myCompany.GetZipCode(); Session.myCompany.SetZipCode(theZipCode & -1234 ); </cfscript>
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You may remember that SetZipCode() is a void function (as almost all setter functions are), so it doesn t return a value. To invoke a void function, you simply call it directly rather than set a variable to its return value, as shown in the first line of the preceding script. Some developers have an aversion to void functions and instead substitute traditional functions that return True on success or False on failure, but this is not a sound design, because to implement such code, you must internally handle errors as exceptions and then produce a viable return value as a proxy for a genuine error. This technique goes against the concepts of sound exception handling. An error that doesn t describe an expected alternative (that is, exception-al) path of execution is indeed an error that should either be rethrown from within a CFTRY block or fall through your exception-handling framework to be caught by an errorhandling template. (See 21 for a detailed explanation.) Don t be afraid to implement void functions. If your function doesn t need to return a value, it is indeed a void function. If your void function throws an error, your exception-handling framework can handle it.
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22 Understanding ColdFusion MX Components
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Whereas components aggregate related functions into a single unit, packages aggregate related components into an even larger unit. A package contains components that are designed to work together as a complete library of functions with a general common purpose. Say, for example, that you have two components named Comp.cfc and Emp.cfc that handle employee bonus calculations, and you want them to be part of the CalcBonus package. Creating a component package is rather simple just follow these basic steps: 1. Create a directory (or hierarchy of directories) that is addressable by ColdFusion Server. 2. Place your components in that directory (or throughout your hierarchy of directories). 3. Set the access levels of your component functions to reflect the manner in which they are to be called. A common practice is to create a hierarchy of directories under your Web root, where the path is the reverse of the domain name, as follows:
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C:\inetpub\wwwroot\com\herdomain\calcbonus\ C:\inetpub\wwwroot\com\hisdomain\calcbonus\ C:\inetpub\wwwroot\com\mydomain\corp\ C:\inetpub\wwwroot\com\mydomain\corp\partners\ C:\inetpub\wwwroot\com\mydomain\corp\transfers\ C:\inetpub\wwwroot\com\mydomain\utils\
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The following code prevents naming collisions between multiple domains on the same server:
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C:\inetpub\wwwroot\com\herdomain\calcbonus\Comp.cfc C:\inetpub\wwwroot\com\herdomain\calcbonus\Emp.cfc C:\inetpub\wwwroot\com\hisdomain\calcbonus\CompanyCalc.cfc C:\inetpub\wwwroot\com\hisdomain\calcbonus\Emp.cfc
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The resulting ColdFusion notational equivalents to these disk paths are as follows:
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com.herdomain.calcbonus.Comp com.herdomain.calcbonus.Emp com.hisdomain.calcbonus.CompanyCalc com.hisdomain.calcbonus.Emp
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Instantiating s calcbonus package components is, therefore, as simple as using the code shown in the following example:
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