The document discusses object-oriented programming (OOP) concepts like encapsulation, polymorphism, and classes. It introduces the Data Context Interaction (DCI) paradigm created by Trygve Reenskaug and Jim Coplien, which models systems as a network of communicating objects with data, context, and interactions, rather than classes. The DCI paradigm aims to better reflect the dynamic nature of object networks compared to traditional static class-based modeling. The document provides examples of objects and use cases to illustrate the DCI approach.

1. OOP revisited
Data, Context and Interactions
Lev Sivashov
Dnipropetrovsk
July 31, 2014

2. 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. 3
Network of communicating objects

4. 4
Network of communicating objects
with a common goal

5. 5
A class
?
?
?
?

6. 6
A class
?
?
?
?
Static classes are not capable of reflecting the
dynamic objects network

7. 7
To extend end user's mental model

8. 8
To extend end user's mental model
which is not inside an object
but between objects

9. 9
Lean
Agile
DCI

10. 10
The DCI paradigm
Trygve Reenskaug, Jim Coplien

11. 11
Some objects

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1
2
3
...and a use case

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1
2
3
...or this way

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4
1
3
1
2
3
2
...and another one

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1 3
4
1
2
3
2
...or this way

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1 3
4
1
2
3
2
1
2
3

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1 3
4
1
2
3
2
1
2
3
1
2
3
4

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1
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3
1
2
3

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1
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1
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Data

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1
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1
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Data
Context

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1
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1
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Data
Context
Interactions

22. 22
what the system is what the system does
Objects Use case
Roles

23. Your
QR Code
Lev Sivashov
lsivashov@gmail.com
https://github.com/lpld/simple-scala-dci
Simple DCI implementation in Scala:
Any questions