Migration of a Chosen Architectural Pattern to Service Oriented ...

Chapter 5. Guidelines 124was implemented intentionally or it is just an artificial product of Reverse Engineering.The second criterion is quite obvious having selected pattern for migration inmind.The third criterion rejects projects implemented with frameworks implementedMVC like Zend, JSF, Spring MVC or ASP.NET MVC. This is a serious constraintaking into consideration a number and popularity of those frameworks but therequirement is dictated by the nature of the framework. A framework ”frames” aproject by providing architecture, Application Programming Interface (API) andpreimplemented functionalities. A framework is meant to simplify work by executionof own (preimplemented) code “behind the scene”. The code of applicationusing framework is more transparent than code that does not use frameworks.Complexity of the code using frameworks is also lower because framework providessome core implementation. Unfortunately, it is hard to migrate a projectthat uses a framework because functionality provided by frameworks would haveto be reimplemented. Additionally, even frameworks supporting the same architecturalpattern provide different scope of the support. The guidelines that donot exclude framework would need to be tailored to a particular framework.If more than one projects fulfils the criteria, an additional analysis of availabledocumentation of the projects is carried out. The project with the most detailedand descriptive documentation will be selectedCompletedocumentationBuild uponMVC patternNo frameworksDetailedanalysisFigure 5.14: Overview of the criteria5.3.2 Source of projectsSelection of the system to migrate is not an easy task taking previously statedcriteria into consideration. At the very beginning, open source systems wereconsidered as potential candidates. Unfortunately, found project did not haveany formal documentation- only comments in code (if any) and/or ApplicationProgramming Interface (API). They also did not clearly support any architecturalpattern - lack of documentation. Theoretically, architectural metrics (see [65] formore information) could be used to identify architectural patterns but themetricsdo not prove that the pattern was used intentionally. Additionally, usage oftechnologies like Java Server Faces (supports MVC) also reduce scope of thesearch because those frameworks violate previously stated criteria. Due to all the