Components

1
Components

• Overview, principles techniques
• Chapter 10

2
Components
Result Class diagram with specifications of the
complex components
Interactions with users reading buttons,
displaying

• A component architecture separates system
  concerns
• A good components architecture
• makes a system easier to understand
• transform the design task into several less
  complex tasks

Functionality update, read and signal
3
Components definitions and principles

• Component architecture
• A system structure composed of interconnected
  components
• Component
• A collection of program parts that constitutes a
  whole and has well-defined responsibilities

Interactions with users reading buttons,
displaying
Functionality update, read and signal

• Reduce complexity by separating concerns
• Criteria comprehensibility, flexibility
• Reflect stable context structures
• User interfaces normally in top

4
Components activities
Explore architectural patterns
Criteria
Define subsystems
Identify components
Class diagram
Component specification
Specify complex components
Finished when criteria are fulfilled
5
Architectures Layered architecture
A general division in layers and parts
Lag layer Del part
6
Architectures Generic architecture

• Decompose the interface layer into user interface
  and system interface
• Technical platform is a component that
  represents the encapsulation of the underlying
  technical platform

7
Architectures Client-server architecture
Network
8
Define subsystems Client-server as an example
U User Interface F Function M Model
9
Identify components

• A component can be decomposed when
• In-cohesive
• Too complex