38-1: XFAs, Fuseactions, and Circuits in Java

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Table 38-1: XFAs, Fuseactions, and Circuits
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login successfulLogin failedLogin newAccount
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Fuseaction
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login recommendations badLogin new
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Circuit Login Product Login User
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Define the meaning of each fuseaction
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What is each fuseaction responsible for What fuses are required to fulfill the fuseaction request Creating a structure similar to the one shown in Table 38-2 can help.
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38 Advanced Fusebox
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Table 38-2: Fuseactions, Fuses
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Fuseaction
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Login.login Login.validateLogin
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Fuse
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dsp_Login.cfm qry_ValidatedUser.cfm
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Responsibilities I display a login form to the user. I return a recordset of user info by matching the username and password sent to me against a database of registered users. I receive a recordset called ValidatedUsed. If any rows are returned, I create a CurrentUser structure of user info and then call XFA.successfulLogin; otherwise, I call XFA.failedLogin.
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act_Validate.cfm
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After you ve created this table, you can begin to write the cfcase statements (or create a CFC file) in each circuit s FBX_Switch.cfm file to handle the various fuseactions.
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Define layout files
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Now, determine what parts of the application are set in layout files Will you have one layout file or multiple ones, spread across several circuits What will you name the various layout files
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Write layout files
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Having identified the layout files, create them. As we mention in the section Nested Layouts, earlier in this chapter, this work is often done by graphics artists and HTML specialists, freeing up programmers for other tasks.
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Determine the contents of the FBX_Settings.cfm files
What setup variables does your application require If you re using a database, you may want to create a variable to hold the datasource attribute something such as request.dsn. All your queries then use that variable in their datasource attribute. Since variables set in ancestor circuits are inherited by descendant circuits, you should place any variables that should have more global exposure higher up the circuits tree.
Write Fusedocs
Start by using your individual prototype pages, on top of which you write the Fusedoc. Use the variable names that you fixed on during the prototype markup phase. The responsibilities that you wrote in defining your fuseactions should be directly transferable to the <responsibilities> element in your Fusedoc.
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Write fuses
The Fusedoc that you write in the preceding section should form a contract or work order, telling you exactly what each fuse is responsible for. If your Fusedocs and prototype are done well, any competent programmer can complete the fuses without knowing any more about the application than what the Fusedocs reveal.
Test your fuses
A fuse is designed to run in the context of a Fusebox application and, as such, can t simply be run. Unit-testing fuses before any attempt is made to integrate them into the application, however, is imperative. To accomplish this task, you need to create test harnesses for each fuse. A test harness is a code file that creates the environment in which the fuse to be tested can run. Fusedocs reveal the variables needed. Listing 38-6 gives the Fusedoc and code for act_Validate.cfm. From this code, you can create the test harness shown in Listing 38-13.
Listing 38-13: tst_act_Validate.cfm
<cfset self= Test.cfm > <cf_QuerySim> ValidatedUser userID,firstName,lastName,userPermissions 100|Stan|Cox|13 </cf_QuerySim> <cfset XFA.success= success > <cfset XFA.failure= failure > <cfinclude template= act_Validate.cfm >
This code can now be run to test act_Validate.cfm. Notice the use of the custom tag QuerySim.cfm. This custom tag creates a recordset on the fly, without the need to connect to a database and is ideal for use in testing environments. (You can download the code for this tag at www.halhelms.com.) Notice, too, that the variable, self, is set to Test.cfm, a file that does nothing more than call a wonderful custom tag, Debug.cfm, written by Dan Switzer. This custom tag returns a wealth of information that s very useful in debugging code. (Debug.cfm is available from www.pengoworks.com.)
Integrate and test
One of the nice features of Fusebox is its capability to enable incremental testing. Because circuits are built to run in either standalone or nested mode, you can test whole circuits to ensure that the fuses work together as planned. The FBX_Switch.cfm skeleton file, available at www.fusebox.org, responds to unknown fuseactions by displaying a message on-screen stating that the called fuseaction is not yet implemented a situation preferable to getting File Not Found errors.