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

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Chapter 3. Architectural Patterns 46Knowledge source 1ModeratorKnowledge source 2BlackboardKnowledge source 3Figure 3.8: Example usage of Blackboard pattern4. BrokerOverview – Broker is an architectural pattern that organises communicationwithin distributed system.ElementsClient – is a user application that sends requests to the broker.Broker – has to maintain all requests, provides security and loadbalancing.Node – is a part of the system that encapsulates logic of the system.Relationships – client as a requesting element connects to a broker. Theclient does not know location of nodes. Locations of nodes are known onlyto the broker. The nodes do not know location of the clients, but they knowlocation of the broker. This knowledge is required because each node hasto register itself in the broker. Connections between broker and nodes aredynamic, it means that any node can connect and disconnect in runtime(see figure 3.9).5. Model View Controller (MVC)Overview – the pattern is dedicated for systems that emphasise role of informationdisplayed to users. Due to clear separation of presentation part,the pattern supports development and simplifies maintenance of this sortof systems.ElementsModel – represents represents data of the system and functionalities to manipulatethemView – displays informationController – handles requests from view and translates them to request tomodel.Relationships – Model cooperates with Controller because it can update
Chapter 3. Architectural Patterns 47Client 1Node 1Client 2BrokerNode 2Client 3Figure 3.9: Example usage of Broker patternregistered Controllers. It also cooperates with View because Model cannotify View about changes of state of Model. View interacts with Controllerbecause View invokes Controller. It can also retrieve data fromModel.Controller interacts with both Controller and Model (see figure 3.10)6. Presentation Abstraction ControllerOverview– the purpose of the pattern is similar to the purpose of MVCpattern. This pattern represents different approach to the problem of interactionof a user with an application.ElementsAgent– each agent consist of three elements: Presentation which is meantto provide information to a user, Abstraction manipulating data of thesystem and Controller handling communication between Presentation andAbstraction. Agents are further divided into agents representing particularfunctionalities and agents coordinating the system.Layer of Abstraction– an application consists of several Layers of Abstraction.Each layer contains Agent on the same level of abstraction. The toplayer contains only one agent which coordinates the whole application whilethe “leaves agents” in the lowest layer represent particular functionalities.A layer invokes other layer on behalf of an agent.Relationships– Each Agent can communicate directly with other agentsin the same layer of abstraction. Layers of Abstraction communicate onlywith layers bellow (see figure 3.11).
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Master ThesisSoftware EngineeringTh
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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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