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

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Chapter 3. Architectural Patterns 64exist neither in MVC nor in PAC. The connectors specify more precisely way ofcommunication between elements. Summarizing, MVC pattern is the most generalpattern within the category and becomes representative of User InteractionView.Representative: Model–View–ControllerComponent Interaction ViewCandidates: Explicit Invocation, Implicit Invocation, Client–Server, Peer–to –Peer,Half–Sync / Half–AsyncSelection: Pattern descriptions presented in section 3.2.1 underlines similaritiesbetween Explicit invocation, Implicit Invocation and Client–Server. Client–Serverdefines division of a system into two parts. Explicit and Implicit Invocations alsomake this division but they also introduce new elements determining communicationdetails between Client–Server parts. They are just variants of Client–Serverpattern, therefore Client-Server is more general in terms of previously stated criteria.Peer–to–Peer pattern describes interaction between elements that are clientsand servers in the same time. In fact, this pattern crates a network of modifiedClient-Server entities. The problem appears when a comparison between Client-Server and Half–sync/half–async has to be made. The problem is that those twopatterns describe different model of connection between components. Responsibilitiesof elements those two patterns are incomparable. Parts of Half–Sync/ Half–async pattern in opposite to Client–Server take care about two differentaspects of communication, therefore those two patterns cannot compared to eachother. The Component Interaction view has two representatives.Representative: Half–Sync / Half–Async, Client–ServerDistribution ViewCandidates: Broker,Remote Procedure Call, Message QueueingSelection: Distribution View contains three architectural patterns. The firstin row is Broker. The description of Broker pattern underlines similarities betweenthis pattern and previous category. The structure and functionality of thispattern matches description of Client –Server pattern. In fact, Broker is just amore complex version of Client–Server; therefore, this pattern will not be comparedwith patterns from Distribution View and shall be moved to ComponentInteraction View. Since this pattern is a more complex version of Client–Server,Broker is not a representative of Component Interaction View. Remote ProcedureCall does not have fixed structure. It is rather an idea how to keep connectionsbetween different parts of distributed systems masked. The patterns are incomparable;consequently, this view has also two representatives–both are differentin terms of their structure and functionality.Representative: Remote Procedure Call, Message Queueing
Chapter 3. Architectural Patterns 65View Name Pattern Name RepresentativeLayered View Layers LayersData Flow View Pipe and Filters Pipe and FiltersData –Centered View Shared Repository Shared RepositoryActive RepositoryBlackboardAdaptation View Microkernel MicrokernelInterceptorReflectionReflectionUser Interaction View Model –View –Controller Model –View –ControllerPresentation –Abstraction–ControllerC2Component Interaction Half –Sync / Half –Async Half –Sync / Half –AsyncViewExplicit Invocation Client ServerImplicit InvocationClient ServerPear –to –PearDistribution ViewBrokerRemote Procedure Call Remote Procedure callMessage QueuingMessage QueuingTable 3.3: Architectural Patterns – categories with their representatives3.3 Mutual InteractionThe Problem of pattern interaction is an implication of pattern organisation andcomplexity of systems. This problem cannot be neglected during pattern selection.The problem derives from the fact that combination of patterns affectssystem and have an impact on non-functional properties. A way in which patternsinteract has to be carefully considered. It may strongly increase quality ofa system, but it also may lead to a disaster. This section presents patterns thatare applied together in real systems. The section is organized as follows:1. Definition of Pattern Language – the subsection provides basic definitionof pattern language, including criteria required to be fulfilled by a patternlanguage2. Pattern Language in real systems – presents shortly results of studies aboutnumber of architectural patterns in systems
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Master ThesisSoftware EngineeringTh
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Chapter 1Introduction1.1 Background
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Chapter 1. Introduction 3technique
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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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