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answer is that sometimes a configuration is the appropriate solution because it offers flexibility; with convention, you do things according to a predetermined overall scheme. The reason configuration has become a convention is that in many cases, developers think they need to use configuration to gain flexibility, when in fact convention would have been good enough. Implementing convention does require using reflection, because to make a decision based on convention, you need to know the current context. The big advantage of using convention is that you don t need to maintain configuration whenever changes occur a convention automatically picks up the latest changes. The following are some scenarios in which you would use convention over configuration: When you need to constantly update and manage cross-reference information (e.g., database columns that are mapped to class data members). When your configuration is only of importance to a developer and not an administrator. For example, you would expect an administrator to want to configure which database your application will connect to. But you would not expect your administrator to configure which model belongs to which view and which controller in a Model-View-Controller (MVC) architecture. When you can use reflection and call methods anonymously, without knowing the type information. It is possible to implement conventions using programming languages such as C# and Java, as they support reflection, but the ability to call methods anonymously is much more complicated. Using dynamic languages such as JavaScript and Ruby, it is very easy to call methods or properties on types. When you need to provide your users (and yourself) with hints if something goes wrong. When you use conventions, it is very important to clearly indicate what is wrong when something does not work. Ruby on Rails does a very good job of providing hints about what to do next when something goes wrong. This feature is important because writing code for a system that uses convention only works if you know the convention.
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For this recipe, we ll convert the unit-testing framework described previously into a completely convention-based system. Then when writing unit tests, our only task will be to implement a series of tests in a structure, and the unit-testing framework will do the rest. For illustration purposes, let s look at the template of the unit test again and identify the pieces that need to be converted from a configuration approach to a convention approach. Source: /jaxson/trunk/website/ROOT/scripts/templates/testcontract.html <html> <head> <title>Contract Test Page</title> <script language="JavaScript" src="/scripts/common.js"></script> <script language="JavaScript" src="/scripts/Synchronous.js"></script> <script language="JavaScript" src="/scripts/commontest.js"></script> <script language="javascript" src="/scripts/jsunit/jsUnitCore.js"></script> </head> <body>
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<script language="javascript"> // Setup the output generator setJsUnitTracer( new jsUnitTraceGenerator( "traceoutput")); // Start of defined contract URL's // Potentially define a URL as // var baseURL = "/my/url"; // End of defined contract URL's var testsToRun = { // Start JavaScript code for test cases here testPrototype : function() { // Synchronous functions identically to Asynchronous // but Synchronous waits for the request to complete // Good for testing, but bad for production as the browser hangs var request = new Synchronous(); request.complete = function( statusCode, statusText, responseText, responseXML){ // Do something with the result // Indicate that you are done, and define the output element testManager.success( "statusPrototype"); } // Do something with the request } // End JavaScript code for test cases }; testManager.setTestCases( testsToRun); </script> <table> <tr> <td><h2>Available Tests</h2></td> <td></td> </tr> <tr> <td> <input onclick="testManager.runAll()" type="button" value="Run All Tests" /> </td> <td></td> </tr> <tr> <td>Test</td>
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<td>Status</td> </tr> <!-- Insert GUI for test cases here --> <tr> <td> <input onclick="testManager.testPrototype()" type="button" value="Test Prototype" /> </td> <td id="statusPrototype">Not run</td> </tr> <!-- End test cases here --> </table> <hr /> <table border="1"> <tr> <td><h2>Trace output</h2></td> </tr> <tr> <td id="traceoutput"></td> </tr> </table> </body> </html> The bold lines in the preceding example represent configuration-based code that will be converted into convention-based code. When converting from configuration-based code to convention-based code, you can apply one of two approaches. The first approach is to rewrite the classes used by the unit-testing framework so that they become completely convention based. The advantage to this approach is that the classes are lean and solve the task. The second approach is to keep the configuration functionality, and write a layer on top that implements the convention functionality. The advantage of this approach is that multiple convention solutions can be applied, but the disadvantage is an additional overhead. We ll implement the second approach here, and keep both the configuration and convention layer as lean as possible. Ideally, the configuration layer should contain only the functionality needed by the convention. Additional functionality in the configuration adds unnecessary baggage. The base unit-testing file when converted into a convention file is similar to the following. Source: /website/ROOT/ajaxrecipes/javascript/conventionconfiguration.html <html> <head> <title>Convention over Configuration</title> <script language="JavaScript" src="/scripts/jaxson/common.js"></script> <script language="JavaScript" src="/scripts/jaxson/commontest.js"></script> <script language="javascript" src="/scripts/jsunit/jsUnitCore.js"></script> </head> <body>
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