Definition: UML package diagram is a structural diagram that displays the organization and location of model elements in medium to large scale projects.
Purpose: Shows structure and dependencies between subsystems or modules.
Key Concepts
Packages:
Group of model elements (can include other packages).
Acts as a namespace where all names must be unique.
Packages can be nested, similar to folders.
Structure:
Rectangles with tabs for package names.
Dependencies represented by dotted lines with arrows.
Importance of Package Diagrams
Used to group related UML elements and visualize dependencies.
Helps analyze and determine compilation order.
Structures high-level system elements.
Stereotypes in UML
Definition: High-level classification of an object indicating its type.
Use: Extends UML to fit specific modeling needs.
Representation: Stereotypes written inside angle brackets above class names.
Visibility of Package Elements
Public: Available outside the package (represented by +).
Protected: Available to related elements (represented by #).
Package: Visible to elements in the same package (represented by ~).
Private: Visible only inside the owning namespace (represented by -).
Types of Dependency Relationships
Client and Supplier Packages:
Client uses public elements of the supplier.
If dependency is shown without a stereotype, marked with a use stereotype.
Trace Relationship: Represents historical development from one model to another.
Dependency in Meta-modelling: Rarely encountered in modern object-oriented analysis and design.
Example: Order Tracking Scenario
Modules Involved:
Track Order Module: Provides tracking information for ordered products.
Order Details Module: Communicates with Track Order to fetch order details.
Shipping Module: Provides shipping information to Track Order.
Establishing Package Dependencies
Identifying Packages:
Determine necessary modules and their interdependencies.
Example: Track Order module depends on Order Details and Shipping modules.
Communication:
Dual dependency between modules.
Conclusion
Importance of understanding package diagrams for efficient system modeling.
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