OOP revisited

Data, Context and Interactions

Lev Sivashov

Dnipropetrovsk

July 31, 2014

2

In OOP we trust

Cohesion

Polymorphism

Encapsulation

Classes

Mixins

Traits

Interfaces

Encapsulation

Objects

Packages

Aspects

Instances

DelegationAbstractions

Prototypes

Messages

Patterns

Meta-classes

Decoupling

Inheritance

3

Network of communicating objects

4

Network of communicating objectswith a common goal

5

A class

?

??

?

6

A class

?

??

?

Static classes are not capable of reflecting the dynamic objects network

7

To extend end user's mental model

8

To extend end user's mental model

which is not inside an objectbut between objects

9

Lean

Agile

DCI

10

The DCI paradigm

Trygve Reenskaug, Jim Coplien

11

Some objects

12

1

2

3

...and a use case

13

1

2

3

...or this way

14

4

1

3

1

2

3

2

...and another one

15

1 3

4

1

2

3

2

...or this way

16

1 3

4

1

2

3

2

1

2

3

17

1 3

4

1

2

3

2

1

2

3

12

3

4

18

1

2

3

1

2

3

19

1

2

3

1

2

3

Data

20

1

2

3

1

2

3

Data

Context

21

1

2

3

1

2

3

Data

Context

Interactions

22

what the system is what the system does

Objects Use case

Roles

Your QR Code

Lev Sivashov

lsivashov@gmail.com

https://github.com/lpld/simple-scala-dci

Simple DCI implementation in Scala:

Any questions