Software Engineering S18 Component-Based Software Engineering

Front 1

CBSE

Back 1

Component-based software engineering (CBSE) is an approach to software development that relies on reuse.

Front 2

CBSE emerged from the _______

Back 2

emerged from the failure of object-oriented development to support effective reuse. Single object classes are too detailed and specific.

Front 3

Components vs. object classes

Back 3

Components are more abstract than object classes and can be considered to be stand-alone service providers.

Front 4

Component in CBSE

Back 4

A component is an independent executable entity that can be made up of one or more executable objects.

Front 5

CBSE Essentials (4)

Back 5

1) Independent components specified by their interfaces.

2) Component standards to facilitate component
integration.

3) Middleware that provides support for component interoperability.

4) A development process that is geared to reuse.

Front 6

CBSE & SE Design Principles

Back 6

 Components are independent so that they do not interfere with each other
 Component implementations are hidden
 Communication is through well-defined interfaces
 Component platforms are shared and dev. costs are reduced

Front 7

CBSE Challenges

Back 7

1) Component Trustworthiness
2) Component Certification
3) Emergent Property Prediction
4) Requirements Trade-offs
----how do we do trade-off analysis b/t the features of 1 component and another

Front 8

Component Characteristics (5)

Back 8

1) Standardized
2) Independent
3) Composable
---all external interactions must take place through publicly defined interfaces
4) Deployable
---stand-alone, binary executable (no compilation req'd)
5) Documented

DISCD

Front 9

Component Interfaces: "Provides" interface

Back 9

Defines the services that are provided by the
component to other components

Ex: the methods
Print
GetQueue
Remove
etc.

Front 10

Component Interfaces: "Requires" interface

Back 10

Defines what services must be made available for the component to execute as specified.

Ex:
GetPDfile
PrinterInt

where 'PrinterInt' is a service that transfers commands to a specified printer

Front 11

Component Models (defn)

Back 11

A component model is a definition of standards for component implementation, documentation, and deployment.