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@nicolas_frankel
Object-Oriented
Programming in the
Enterprise
@nicolas_frankel
• Developer, team lead, architect,
whatever it takes
• Recently Developer Advocate
• Long-time believer in
maintainable code
Me, myself and I
@nicolas_frankel
Hazelcast
HAZELCAST IMDG is an operational,
in-memory, distributed computing
platform that manages data using
in-memory storage, and performs
parallel execution for breakthrough
application speed and scale.
HAZELCAST JET is the ultra fast,
application embeddable, 3rd
generation stream processing
engine for low latency batch
and stream processing.
@nicolas_frankel
• Who is doing Java?
• Who is doing OOP?
Quick show of hands
@nicolas_frankel
An object
@nicolas_frankel
Object-oriented programming
@nicolas_frankel
Object calisthenics
@nicolas_frankel
1. Only one level of indentation per method
2. Don’t use the else keyword
3. Wrap all primitives and strings
4. First class collections
5. One dot per line
6. Don’t abbreviate
7. Keep all entities small
8. No classes with more than two instance variables
9. No getters/setters/properties
Object calisthenics
@nicolas_frankel
The Spring Pet Clinic
@nicolas_frankel
• Controllers
• Services
• Repository/DAO
Classical enterprise layers
@nicolas_frankel
• Anemic domain model
• Accessors (getters/setters)
• Logic sprinkled into services
Service?
@nicolas_frankel
@nicolas_frankel
• Code reuse
• Encapsulation
• "Natural” mapping with the real
world
Promises of OOP
@nicolas_frankel
• Extra effort
• Extra complexity
• (Not complete)
Cons of our approach
@nicolas_frankel
Be pragmatic!
Take away
@nicolas_frankel
• https://blog.frankel.ch/
• @nicolas_frankel
• https://git.io/JeMJI
• https://bit.ly/2Y3sDju
Thanks!

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