Question 8

Question 1

What is component based development

Answer 1

CBd aims to develop systems by assembling them from reusable self contained software components. Which interact through interfaces.

Question 2

What is a provided interface?

Answer 2

Specifies what the component makes available (provides) to other components

Question 3

What is a required interface ?

Answer 3

Specifies what the component requires from other components

Question 4

Suggest one advantage and one disadvantage of developing software by plugging together off the shelf components

Answer 4

Advantages :
Cheaper
Quicker
Replaceable with other components with the same interface

Disadvantages:
Restricted to the capabilities of the component
Some additional software is likely to be needed
Adapters may be required

Question 5

What are services

Answer 5

A service is an abstract description of some unit of business functionality, usually described in terms that are meaningful from both a business and a technical perspective.

E.g. External suppliers may provide credit card validation or online payment services

Question 6

Usability and performance scenarios

What are the 6 areas

Answer 6

Source- human, other systems (anything that generates a stimulus)

Stimulus- event or request

Artefact- what responds to the stimulus

Environment - conditions the system will be operating under

Response- what happens as a result of the artefact receiving the stimulus

Response measure - what can we use to test if the requirement has been met? Latency, jitter, data loss etc