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Packaging
for Detailed Design


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Overview
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  • The Package Concept
  • Packages in UML
  • Identifying/Creating Packages
  • Example
Packaging
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  • The Concept:
    • Group/organize components
  • The Rationale:
    • "Chunking"
    • Provide a higher-level view (abstraction)
    • Increase cohesion
    • Reduce coupling
    • Have an organizational role similar to directories/folders
Packages in UML
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  • Packages define a namespace
    • Two packages can contain components with the same name
    • Package names can be prepended to class names (e.g., Plant::Leaf and Hierarchy::Leaf)
  • Every element belongs to a package
    • The highest level package is the root package
  • Packages can contain other packages
    • java::awt contains java::awt::event
Packages in UML (cont.)
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  • Basic Notation:
    • images/package1.gif
  • Dependencies:
    • images/package4.gif
Packages in UML (cont.)
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  • Imports:
    • Use a stereotyped dependency
    • images/package2.gif
  • Global Packages:
    • images/package3.gif
Identifying/Creating Packages
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  • Components with a common purpose
  • Components that participate in the same use cases
  • Components that are strongly associated
An Example: Some Java Packages
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images/javapackages.gif
An Example: Packages in IVANA
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images/ivana_packages1.gif
An Example: Packages in IVANA (cont.)
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images/ivana_packages2.gif
There's Always More to Learn
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