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

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Chapter 3. Architectural Patterns 62async. This missing pattern will be further considered as a Component InteractionPattern because the pattern describes ways of communication between elementsof the system. It separates synchronous operations from asynchronous. Existenceof only one non–assigned pattern shows that selected categorisation method fitswell to list of identified patterns.3.2.4 Selection of representativesFilter 5:Selection of representatives for categoriesThis subsection provides list of representatives of patterns assigned to categoriesin previous subsection as well as motivation behind selection of those representatives.Thiscriterion of selection is structure (elements and relations among them)of the pattern including purpose and behavior of elements of the pattern. Themore generic structure a pattern has, the more likely it is to become a representativeof the category. The structure is generic when it is similar to structure ofother patterns in the same category and has the lowest complexity. A categorymay have more than one representative when structure of considered patternsis very different. All the patterns rejected during previous steps are not takenand will not be taken into consideration during pattern selection. The selectionof representatives shown below provides a list of candidates (patterns from category),motivation behind each selection and selected representative(s). Summaryof representatives allocated to particular categories is provided in table 3.3Layered ViewCandidates: LayersSelection: This category is composed of only one pattern so this pattern automaticallybecomes the representative.Representative: LayersData Flow ViewCandidates: Pipes–and–FiltersSelection: This category is composed of only one pattern so this pattern automaticallybecomes the representative.Representative: Pipes–and–FiltersData Centred ViewCandidates:Shared Repository, Active Repository, BlackboardSelection: Consideration of all of the candidates in terms of criterion for selectionof representatives results in conclusion that Blackboard pattern is not a goodrepresentative because this pattern introduce a moderator, which does not existsin remaining two patterns. However, amount of elements does not decideabout pattern rejection, but a behavior of this particular element does. Moderatorintroduces additional data access mechanism that does not exist in remain
Chapter 3. Architectural Patterns 63two patterns. Shared and Active Repositories are different in only one, but veryimportant detail. Active Repository provides notification service what makes itmore specialized then Shared Repository, consequently Shared Repository is moregeneral, therefore it automatically becomes the representative of this view.Representative: Shared RepositoryAdaptation ViewCandidates: Microkernel, Reflection, InterceptorSelection: Microkernel is a pattern that strongly influences architecture of system.Everything has to be organized around the kernel of the system. Communicationthrough this element is the only way to get to other elements of the pattern.Interceptor has also a main part –Interceptor Manager, which serves as a mainconnection to remaining parts of the system. Additionally, Interceptor providesfunctionality allowing invocation of other elements before the target element isreached. This makes the pattern less abstract than Microkernel. The last candidate-Reflection is a very specific pattern. This pattern has the structure of thesystem build inside. The pattern is aware of the elements and relations betweenthem. There is no way to compare structure of Reflection to Microkernel. Thiscategory has two representatives –Microkernel and Reflection.Representative: Microkernel, ReflectionLanguage Extension ViewCandidates: noneSelection: The category does not have any pattern assigned so consequently thereis no candidates and no representatives.Representative: noneUser Interaction ViewCandidates: Model–View–Controller, Presentation–Abstraction–Controller, C2Selection: User Interaction View consists of three patterns. The first in rowis Model-View-Controller. The pattern was mentioned before as an example ofcategorisation of an architectural pattern as a design pattern. The second is PresentationAbstraction Controller (PAC). Names of both patterns underline similarapproach to the problem of user interaction. Elements of PAC pattern can bemapped to some degree to elements of MVC but in case PAC those elements arenot the main elements. The main elements of PAC pattern are agents containingpresentation, abstraction and controller parts. Those parts could be theoreticallyreplaced by MVC parts, this makes the pattern sort of a MVC agent network,therefore, MVC pattern is more general than PAC. The last pattern in this viewis C2 pattern. C2 is not as similar as PAC and MVC. C2 defines componentsthat serve as elements in MVC or PAC, but in opposite to MVC or PAC they donot have specialized function. Even if an artificial division of C2 elements intoModel / View / Controller components is made, there remain connectors that do
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Master ThesisSoftware EngineeringTh
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AbstractContext: Several examples o
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List of Figures1.1 Research methodo
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List of Tables3.1 Summary of archit
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Chapter 1Introduction1.1 Background
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Chapter 1. Introduction 3technique
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Chapter 1. Introduction 9Chapter 4
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Chapter 5. Guidelines 123FrontendFr
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Chapter 5. Guidelines 125complicati
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Chapter 5. Guidelines 127Concluding
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Chapter 5. Guidelines 129UsecasesTh
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Chapter 5. Guidelines 135Output: Du
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Chapter 5. Guidelines 137generation
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Chapter 5. Guidelines 139(a) Fronte
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Chapter 5. Guidelines 141Figure 5.1
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Chapter 5. Guidelines 143Figure 5.1
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Chapter 6. Conclusion 149RQ.6 How t
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References[1] http://www.soa-manife
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References 153[22] Frank Buschmann,
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References 155[46] Dirk Krafzig, Ka
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References 157[67] Xiaohong Qiu. Bu
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