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

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Chapter 3. Architectural Patterns 44Layer – A layer encapsulates common logic on the same level of abstraction.Each layer provides an interface allowing another layer to cal its functionality.Relationships – A layer can use other layer only if they are connected.There are uni and bi directional relations between layers. This pattern ischaracterized by lack of direct calls of layers to non-neighbor layers. If thelayer number one wants to call the method from the layer number threeand there is no direct connection between them, the layer number one hasto call the layer number two in order to call the layer number three. Alayer can invoke only a layer that is bellow or above this layer. Connectionlimited to only upper and lower layer increases maintainability but reducesperformance (see figure 3.6).Layer 1Layer 2Layer 3Figure 3.6: Example usage of Layer pattern2. Pipe and filtersOverview – The pattern is characterized by a good and efficient way ofdata processing but the structure of the pattern reduces its reliability becauseif one of the filters fails, the whole process fails as well.ElementsFilter – processes data. A filter can push data to a pipe or pull it out froma pipe.
Chapter 3. Architectural Patterns 45Pipe – forwards processed data to next filter.Relationships – Each pipe connects two filters and each filter has to beconnected to at least one pipe. There is no possibility to connect a pipe toa pipe or a filter to a filter directly. Additionally, pipes offer only unidirectionalconnections (see figure 3.7)Filter 1PipeFilter 4PipeFilter 3PipeFilter 2PipeFigure 3.7: Example usage of Pipes and Filters pattern3. BlackboardOverview – the pattern is very useful when no deterministic solution isknown. The pattern improves solution-finding process that bases on smalldeterministic solutions.ElementsBlackboard – contains all currently gained knowledge or solutions. Theblackboard serves also as a place for future solutions / knowledgeKnowledge source – provides more advanced or more complete solutionbased on own data and blackboard’s information.Moderator – moderates knowledge improvement. The element determinesthe order in which every source of knowledge has to access the blackboard.Relationships – Moderator is in relationship with Knowledge Source andBlackboard. Knowledge Source can operate only on Blackboard. Blackboarddoes not invoke other elements of the pattern (see figure 3.8).
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Master ThesisSoftware EngineeringTh
Page 3 and 4: AbstractContext: Several examples o
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Chapter 4. Service Oriented Archite
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Chapter 5. Guidelines 1035.1 Patter
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Chapter 5. Guidelines 105Descriptio
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Chapter 5. Guidelines 107Result Con
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Chapter 5. Guidelines 109ContextAn
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Chapter 5. Guidelines 111Result Con
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Chapter 5. Guidelines 113System’s
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Chapter 5. Guidelines 115ViewSchema
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Chapter 5. Guidelines 117ViewViewCo
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Chapter 5. Guidelines 119ViewViewCo
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Chapter 5. Guidelines 121ViewViewPr
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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 131puter (ext
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Chapter 5. Guidelines 133Group 3 ma
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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 5. Guidelines 145FrontendSc
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Chapter 6. Conclusion 147There are
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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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