Analysis Patterns-Patterns in Software Engineering-Lecture 19 Slides-Computer Engineering, Slides of Software Engineering

Download Analysis Patterns-Patterns in Software Engineering-Lecture 19 Slides-Computer Engineering and more Slides Software Engineering in PDF only on Docsity! Patterns in Software Engineering Lecturer: Raman Ramsin Lecture 19 Analysis Patterns Part 2 Department of Computer Engineering 1 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns Th ti tt d ib h t t k l i tte suppor ng pa erns escr e ow o a e ana ys s pa erns and apply them: Layered Architecture for Information Systems: These patterns consider the architecture for a client/server information system and how such a system can be layered to improve its maintainability. Patterns for Type Model Design Templates: These patterns focus on how conceptual models can be implemented, suggesting common patterns to turn analysis patterns into software. Association Patterns: These patterns focus on examining modeling techniques themselves and how advanced modeling constructs can be viewed as patterns. Department of Computer Engineering 2 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Layered Architectures - Tiered Architectures Two Tier Three Tier Department of Computer Engineering 5 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Layered Architectures - Presentation & Application Logic Problem: Application software handles both interpretation of the domain model and driving the user interface. Solution: Separate the application tier into presentation (user interface) and application logic (dealing with the domain model). Structure the application logic as a set of facades for the presentation. Department of Computer Engineering 6 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Layered Architectures - Presentation & Application Logic Department of Computer Engineering 7 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Type Model Design Templates – Implementing Generalizations Problem: Implementing generalization, especially if multiple and dynamic classification is involved. Solution: Use inheritance. Use classes for each combination of subtypes with multiple inheritance . Use an internal flag. Delegate to a hidden class (state pattern). Copy and replace. Department of Computer Engineering 10 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Type Model Design Templates – Object Creation P bl C i bjro em: reat ng an o ect. Solution: Use a creation method with arguments for all mandatory and immutable mappings . Department of Computer Engineering 11 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Type Model Design Templates – Object Destruction Problem: Destroying an object. Solution: Have a specific destruction method. Define how much the delete should cascade. Department of Computer Engineering 12 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Association Patterns - Associative Type Problem: Adding features to an association. Solution: Create a type for the association. Use a special notation. Department of Computer Engineering 15 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Association Patterns - Associative Type Department of Computer Engineering 16 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Association Patterns - Keyed Mapping P bl R i l i i h k d ffro em: epresent ng va ues n a mapp ng t at are eye o another type. Solution: Use a keyed mapping . Department of Computer Engineering 17 Sharif University of Technology Patterns in Software Engineering – Lecture 19 Supporting Patterns: Association Patterns - Historic Mapping Department of Computer Engineering 20 Sharif University of Technology Patterns in Software Engineering – Lecture 19 R fe erence Fowler, M., Analysis Patterns: Reusable Object Models, Addison- Wesley, 1997. Department of Computer Engineering 21 Sharif University of Technology