Domain Driven Design

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The objective of this session is to introduce the subject of software engineering. When you have read this session you will understand what software engineering is and why it is important, know the answers to key questions which provide an introduction to software engineering, understand ethical and professional issues which are important for software engineers.

Introduction

Virtually all countries now depend on complex computer-based systems. More and more products incorporate computers and controlling software in some form. The software in these systems represents a large and increasing proportion of the total system costs. Therefore, producing software in a cost-effective way is essential for the functioning of national and international economies.

Software engineering is an engineering discipline whose goal is the cost-effective development of software systems. Software is abstract and intangible. It is not constrained by materials, governed by physical laws or by manufacturing processes. In some ways, this simplifies software engineering as there are no physical limitations on the potential of software. In other ways, however, this lack of natural constraints means that software can easily become extremely complex and hence very difficult to understand.

Software engineering is still a relatively young discipline. The notion of ‘software engineering’ was first proposed in 1968 at a conference held to discuss what was then called the ‘software crisis’. This software crisis resulted directly from the introduction of powerful, third generation computer hardware. Their power made hitherto unrealisable computer applications a feasible proposition. The resulting software was orders of magnitude larger and more complex than previous software systems.

Early experience in building these systems showed that an informal approach to software development was not good enough. Major projects were sometimes years late. They cost much more than originally predicted, were unreliable, difficult to maintain and performed poorly. Software development was in crisis. Hardware costs were tumbling whilst software costs were rising rapidly. New techniques and methods were needed to control the complexity inherent in large software systems.

These techniques have become part of software engineering and are now widely although not universally used. However, there are still problems in producing complex software which meets user expectations, is delivered on time and to budget. Many software projects still have problems and this has led to some commentators (Pressman, 1997) suggesting that software engineering is in a state of chronic affliction.

As our ability to produce software has increased so too has the complexity of the software systems required. New technologies resulting from the convergence of computers and communication systems place new demands on software engineers. For this reason and because many companies do not apply software engineering techniques effectively, we still have problems. Things are not as bad as the doomsayers suggest but there is clearly room for improvement.

Quiz PDF eBook: 
Domain Driven Design
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27 Pages
2010
English US
Educational Materials



Sample Questions from the Domain Driven Design Quiz

Question: what are the differences between entities and value objects?

Choices:

entities are immutable objects while value objects are mutable objects

an entity has a unique identity while a value object doesn't

sharing value object is thread safe as it is immutable

sharing an entity is thread safe as it has a unique identity

Question: What is the role of the Domain layer in model driven design paradigm?

Choices:

harmonize and monitors the application activities and its progress

renders output to the user and gathers user gestures

encapsulates the core of the business logic

implements entities persistence, and layers communication

Question: how would you implement a bank account object?

Choices:

as transfer object

as a value object

as an entity

Question: What is the most suitable programming language concept for implementing the model of Domain Driven Design paradigm?

Choices:

Procedural languages such as C, Pascal

Object-oriented programming such as Java, C++

Aspect oriented programming such as AspectJ

Question: How should you implement a value object?

Choices:

mutable object

immutable object

both are correct

Question: What is the role of the Infrastructure layer in model driven design paradigm?

Choices:

encapsulates the core of the business logic

implements entities persistence, and layers communication

renders output to the user and gathers user gestures

harmonize and monitors the application activities and its progress

Question: What is the role of the presentation layer in model driven design paradigm?

Choices:

implements entities persistence, and layers communication

encapsulates the core of the business logic

renders output to the user and gathers user gestures

harmonize and monitors the application activities and its progress

Question: For an e-Shop web application, the customer will provide his personal information for shipment of the ordered products. You would like to attach residence, invoice, delivery addresses to a person object. how would you implement the address object?

Choices:

as an entity

as a value object

as a transfer object

Question: How should you implement an Entity?

Choices:

mutable object

immutable object

both are correct

Question: which of the following are considered domain driven design patterns?

Choices:

aggregates

layered architecture

model view controller (MVC)

Data Access Object (DAO)

Question: What is the role of the Application layer in model driven design paradigm?

Choices:

renders output to the user and gathers user gestures

implements entities persistence, and layers communication

encapsulates the core of the business logic

harmonize and monitors the application activities and its progress

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