Object-Oriented Design Lecture 18 Implementation Workflow Sharif University of Technology 1 Department of Computer Engineering Implementation Workflow • Implementation is primarily about creating code. However, the OO analyst/designer may be called on to create an implementation model. • The implementation workflow is the main focus of the Construction phase. • Implementation is about transforming a design model into executable code. Sharif University of Technology 2 Implementation Modeling • Implementation modeling is important when: • you intend to forward-engineer from the model (generate code); • you are doing CBD in order to get reuse. • The implementation model is part of the design model. • Artifacts - represent the specifications of real-world things such as source files: • components are manifest by artifacts; • artifacts are deployed onto nodes. • Nodes - represent the specifications of hardware or execution environments. Sharif University of Technology 3 Implementation Model Sharif University of Technology 4 Implementation Workflow: Activities • The Implementation Workflow consists of the following activities: • Architectural Implementation • Integrate System • Implement a Component • Implement a Class • Perform Unit Test Sharif University of Technology 5 Architectural Implementation • The UP activity Architectural Implementation is about identifying architecturally significant components and mapping them to physical hardware. • The deployment diagram maps the software architecture to the hardware architecture. • Deployment diagrams allow you to model the distribution of your software system over physical hardware. • In the design workflow you can create a "first cut" deployment diagram by identifying nodes or node instances, and relationships; • You refine this as part of the implementation workflow by adding components or component instances. Sharif University of Technology 6 Deployment Diagram: Descriptor Form • The descriptor form deployment diagram may be used to model what types of hardware, software, and connections there will be in the final deployed system. • It describes a whole set of possible deployments. • It shows: • nodes - what types of software environments and hardware run the system; • relationships - the types of connections between the nodes; • components - the types of components deployed on particular nodes. Sharif University of Technology 7 Deployment Diagram: Nodes • Node - represents a type of computational resource. • «device» - a type of physical device such as a PC or a Sun Fire server. • «execution environment» - a type of execution environment for software, such as an Apache web server. • Node instance - represents a specific computational resource. Sharif University of Technology 8 Deployment Diagram: Descriptor Form – Example Nodes Sharif University of Technology 9 Deployment Diagram: Instance Form • The instance form deployment diagram shows a particular deployment of the system over specific, identifiable pieces of hardware. • It describes one specific deployment of the system, perhaps at a specific user site. • It shows: • node instances - specific pieces of software environments and hardware; • relationship instances - specific relationships between node instances; • component instances - specific, identifiable pieces of software deployed on a node instance; for example, a particular copy of Microsoft Office with a unique serial number. Sharif University of Technology 10 Deployment Diagram: Instance Form – Example Nodes Sharif University of Technology 11 Deployment Diagrams: Stereotyping through Icons Sharif University of Technology 12 Deployment Diagram: Artifacts • Artifact - represents the specification of a real-world thing such as a particular executable file, source file, document or database table. • Artifacts can manifest one or more components. • Artifact instance - represents a specific instance of a particular artifact, such as a specific copy of a particular executable file deployed on a particular machine. Sharif University of Technology 13 Artifacts: Example Sharif University of Technology 14 Artifacts: Internal Structure – Example Sharif University of Technology 15 Artifacts: Standard Stereotypes Sharif University of Technology 16 Artifacts: Profile Stereotypes – Example Sharif University of Technology 17 Deployment Diagram: Complete Example Sharif University of Technology 18 Reference • Arlow, J., Neustadt, I., UML 2 and the Unified Process: Practical Object-Oriented Analysis and Design, 2nd Ed. Addison-Wesley, 2005. Sharif University of Technology 19.