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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Migrating User-Defined Functions to Components
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If you find that, after answering the qualifying questions, some of your existing functions are best implemented as functions declared within components, follow these steps: 1. Start by identifying the entities and business processes that are to be supported by the functions that qualify for implementation as components. Create a component file named for each entity or process. 2. As a temporary step, translate all CFSCRIPT-based UDFs to CFFUNCTION-based UDFs. Use the same function and argument names, specify their ReturnType attributes, and leave the new functions in the same locations as their previous versions. 3. As you translate each function, fully regression-test it to make sure that the function still executes correctly. This process ensures that, as you take the next step in the migration process, you introduce as few new problems as possible. 4. Add all qualifying functions to their respective component files and wrap the collection of functions with a single CFCOMPONENT tag pair. 5. Determine the user roles to which each new function must be restricted and then add the roles attribute to each restricted function. 6. Set the appropriate access level required by each function by adding the access attribute. 7. If you are so inclined, add metadata documentation attributes to the CFCOMPONENT, CFFUNCTION, CFARGUMENT, and CFPROPERTY tags. 8. If the component is not to be persisted longer than a single page request, place the instantiation call in all templates that require the component. Now prefix all former local function calls with instanceName. 9. If an instance of the component is to be persisted in the Application scope, it most likely declares class methods only. Wrap its instantiation call in an IsDefined() test for existence of the instance and then place this snippet in your Application.cfm templates. Now prefix all former local function calls with Application.instanceName. 10. If an instance of the component is to be persisted in the Session scope, it most likely declares at least some instance methods, so you need to add to the component the appropriate InitEntity(), GetEntity(), and FlushEntityToDatabase() functions and to assign a unique lock name. (See 22 for details on implementing longlived persistent components.) After this procedure is done, place the instantiation call in your template that begins the process requiring the component. Now prefix all former local function calls with Session.instanceName. 11. Regression-test the application and fix any problems.
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Migrating Custom Tags to Components
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If you find that, after answering the qualifying questions, some of your existing custom tags are best implemented as functions declared within components, follow these steps: 1. For a custom tag to be a true candidate for having all of its code migrated to a component function, the tag s primary purpose must be to set local variables back in the calling template. Count the number of values set in the caller by the custom tag and then migrate the business logic of the custom tag to a user-defined function.
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24 Migrating Custom Tags and UDFs to Components
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If the number of values set is only one, make the Returntype of the UDF the same as that value s data type. If more than one value is set in the caller, make the Returntype of the UDF a Struct and add <cfset Var returnStruct = StructNew()> as the first line of business logic in the function. Now modify the code to manipulate key-value pairs in returnStruct rather than individual variables. 2. Back in the caller, call the new component function in place of the previous custom tag and then reference the returned structures key-value pairs rather than the original local variables that used to be set by the custom tag. 3. If the data manipulation logic of a custom tag is a standalone routine, combining both data logic and display markup together in the custom tag is perfectly feasible. If, however, the data manipulation portions of a custom tag are closely bound to an entity or a clearly defined business process, you should separate the code for those data services from the custom tag, migrate the code to a function declared within the component that supports that entity or business process, and leave the display element in the custom tag. You have good reasons for doing this. A component should contain all the functionality necessary to completely support an entity or business process s data, and separating logic from display markup is a best practice, so this custom tag plus component function approach is viable.
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ColdFusion MX was designed from the very beginning to make maximum reuse of code in ways that simply can t be handled by the custom tags and user-defined functions of earlier versions. Yes, components are a very powerful addition to the ColdFusion arsenal, but they are not the panacea for all that ails your application. Included templates, custom tags, and user-defined functions are just as viable as they were in earlier versions of ColdFusion; you just have more choices in MX, and some of these choices are better choices. By thoughtfully answering the qualifying questions posed in this chapter, you are guided toward the most appropriate technique for implementing your reusable code.
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