MIS 161 Systems Development Life Cycle II Lecture 4: Implementation Diagrams

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MIS 161Systems Development Life Cycle
IILecture 4Implementation Diagrams
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Types of Implementation Diagrams

• Models the physical aspects of an OO system
• Models the static view
• Component Diagrams
• Deployment Diagrams

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Component Diagrams

• A component is a physical piece of system used
  during implementation
• Software code
• Business documents
• A component diagram shows a set of components and
  the relationships among them
• Typically maps to one or more classes,
  interfaces, and collaborations

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Examples of Components

• GUI
• Software code
• Source, executable, or binary
• Database

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Dependencies

• Relationships between two elements, where a
  change to the one element (independent element,
  a.k.a. client) affects the other element
  (dependent element, a.k.a. supplier or source)

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Dependencies

• Show who needs who
• Appear as dashed-arrows on implementation
  diagrams
• Show how components communicate with each other
• Direction indicates knowledge in the communication

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Simple Component Diagram
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Interfaces

• Appear as circles on implementation diagrams
• Specify service offered by the component
• Represent externally visible behavior of the
  component

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Component Diagram
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Deployment Diagrams

• A diagram that shows a set of nodes and the
  associations between them.
• Associations between nodes generally represent
  physical connections, such as those involving the
  Internet

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What Deployment Diagrams Show

• Configuration of run-time processing elements
• Software components, processes, and objects that
  live during run time
• A set of nodes and the association and
  dependencies among them

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Nodes

• Are usually represented by some kind of
  computational unit
• Are typically pieces of hardware with memory and
  processing capability

Nodes
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Nodes

• As a specific instance they are listed with a
  name, colon, and node type
• Syntax name '' node-type
• Example Joe'sMachinePC

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Example of Nodes and Associations
Printer
Joes PC
ltltUSBgtgt
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UML Notation
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Deployment Diagram
AdminServerHostMachine
Update
JoesMachinePC
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Method Specifications

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Method Specification

• A description of the methods in the individual
  classes
• Provides detail for the programmers
• Instructions on how to write the code
• Provide one specification for each method

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Syntax

• No formal syntax specification
• General information
• Events
• Message Passing
• Algorithm Specification
• Method Specification Form Example