1. Chapter 13
Logical Architecture

2. Logical Architecture Large-scale organization of classes
Packages
Subsystems
Layers
Tools - UML package diagrams

3. Layer Coarse grained Cohesive responsibility Strict or relaxed
E.g. User Interface
Strict or relaxed

4. Software Architecture
Many definitions
Key aspect: Large scale, big ideas
Motivation
Constraints
Organization
Patterns
Responsibilities
Connections

5. Design with Layers Organize layers using related responsibilities
Collaboration and Coupling
Layers Pattern
Model view controller pattern

6. Why? Separation of concerns Encapsulate complexity Replaceable
Reusable function
Team organization

7. Domain layer vs. Application Layer
Application layer organization
Create domain object that encapsulate application logic (Domain Layer)
Domain layer != Domain model
However - many domain model concepts become domain layer classes

8. Terminology Tier - current usage: physical nodes Layers
Partitions - parallel division of layers

9. SSD, System Operations, Layers
When there is a UI layer:
SSD shows operations to the UI Layer

10. Summary Separation into layers is a common first step
In Architecture centric design, this flows from the software architecture