Functional Patterns with Java8 @Bucharest Java User Group

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The slides for the presentation I gave at Bucharest Java User Group. This session was the largest Romanian Java community meetup ever organized until now.

Software

#DevoxxUK @victorrentea
Functional Programming
Patterns with Java 8
- live coding marathon -
Victor Rentea
IBM Lead Architect & Independent Trainer
victor.rentea@gmail.com
www.VictorRentea.ro
All the commits will be pushed to
https://github.com/victorrentea/functional-patterns-bjug-2018.git

Victor Rentea
13 years of Java
Lead Architect at IBM
Tech Team Lead and Consultant
Clean Code Evangelist
victor.rentea@gmail.com www.VictorRentea.ro
Moscow Paris London Krakow Vienna Sofia Casablanca Bucharest Belgrade Kiew Barcelona

victorrentea.ro @victorrentea
 Spring
 Hibernate
 Clean Code, Architectures
 Java 8, Design Patterns
 Unit Testing
 Java Performance
 Scala & more...
Independent
Technical Trainer & Coach
Victor.rentea@gmail.com VictorRentea.ro
1000+ devs
5 years
tough clients:

victorrentea.ro @victorrentea
Not Convinced?
5

victorrentea.ro @victorrentea
Hard-Core Switch

victorrentea.ro @victorrentea
Let's CODE !!
9
I'll push everything here:
https://github.com/victorrentea/functional-patterns-devoxx-uk

victorrentea.ro @victorrentea
The Clean Code Rules
Applied to Java 8
11

victorrentea.ro @victorrentea
Descriptive Names
Best Lambdas are fit, thin one-liners
Extract heavy lambdas into named ::methods
 in the same class
 in the item class
 as static methods
-> {a-nonymous functions
12
Lambdas

victorrentea.ro @victorrentea
Stream Wrecks
1 usecase = 1 single chain of 30 function calls.
Don't do that !
We beg you !
We have children, families,…
Break them using explanatory variables
Small
Methods
Five Lines
13

victorrentea.ro @victorrentea
Optional
Instead: thatOpt.map(myFunction)
No NullableParameters
Avoid Returning Null,Throw Ex
… or return an Optional
PS: don't be afraid of Orcs, Monads, or .flatMap
14

victorrentea.ro @victorrentea
Passing-a-Block
Pass logic to your function
The Funeral of Template Method™
15

victorrentea.ro @victorrentea
Loan Pattern
You work with a resource
that is managed for you
Decouples real logic from infra code
16

victorrentea.ro @victorrentea
Execute Around Pattern
Explicit AOP
~ Proxy™ or Decorator™
17

victorrentea.ro @victorrentea
Avoid Checked Exceptions
java.util.function interfaces don't declare any throws
Which is good !
You must suffer if you work with non-Runtime Exceptions!
But if you insist:
- Define throwing functional interfaces
- Use libraries: jool, vavr...
18

victorrentea.ro @victorrentea
Type-specific Logic
switch
Switch Hunt Day®
Hope to find them all: JDD
Simplest to Read
1 switch = 1 method
case XX: return …
OOP
Extends is BAD
ONE Shot
Children90Movie
enum
Isolated Logic
In enum methods
Logic with Dependencies
Function references on enums
(bean passed as param)
19

victorrentea.ro @victorrentea
Thank You!
20
Disclaimer: The use of ® or
™ is the slides is only
anecdotic.
So good
we can ask
more
explanations
after the Pizza
What was
that??

victorrentea.ro @victorrentea
Thank You!
21
Disclaimer: The use of ® or
™ is the slides is only
anecdotic.
victor.rentea@gmail.com
www.VictorRentea.ro
Let's Chat:

victorrentea.ro @victorrentea
Thank You!
I'm available
a statement of seniority
I use both
hemispheres
Tough meetings?
Abused estimates?
Purpose of code:
1. Maintainable
-- Uncle Bob
Functional Party
Activist
Stay into
The Light
I brought you some
Motivational Stickers
In-house/remote
training or coaching?
What do You want us
to do the second hour?
(after the Pizza)
victorrentea.ro/vote.html
Dissect some examples
Basic Java8 Tutorial (Slow-motion)
Mocking Kata
TDD Kata
Spring @Transactional
victor.rentea@gmail.com
www.VictorRentea.ro

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In this workshop I will share my experience as a full-time trainer since the COVID-19 outbreak, discussing the techniques I tried, what failed, and what worked, how delivering workshops changed, and what must you do to adapt to today's savage training environment. This is not a sales pitch, but I really want to help you during these times. Agenda: - Impactful content type - Ideal group size - Ways to adjust the content to remote audiences - Engaging techniques that really work - Critical Timing: tricks for better time-use - The art of asking for questions - Ways to persist your impact after the session - Building trust that Online Does Work! - When and How to gather significant feedback? - Marketing your webinar Target Audience: The discussion is not technical (doesn't involve many programming concepts), so anyone interesting in delivering, facilitating or contracting effective online training sessions is invited. Also those preparing to deliver a talk at a conference can benefit from many ideas

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Functional Patterns with Java8 @Bucharest Java User Group

1. #DevoxxUK @victorrentea Functional Programming Patterns with Java 8 - live coding marathon - Victor Rentea IBM Lead Architect & Independent Trainer victor.rentea@gmail.com www.VictorRentea.ro All the commits will be pushed to https://github.com/victorrentea/functional-patterns-bjug-2018.git

3. Victor Rentea 13 years of Java Lead Architect at IBM Tech Team Lead and Consultant Clean Code Evangelist victor.rentea@gmail.com www.VictorRentea.ro Moscow Paris London Krakow Vienna Sofia Casablanca Bucharest Belgrade Kiew Barcelona

4. victorrentea.ro @victorrentea  Spring  Hibernate  Clean Code, Architectures  Java 8, Design Patterns  Unit Testing  Java Performance  Scala & more... Independent Technical Trainer & Coach Victor.rentea@gmail.com VictorRentea.ro 1000+ devs 5 years tough clients:

5. victorrentea.ro @victorrentea Not Convinced? 5

6. Not Convinced? They were!

7. victorrentea.ro @victorrentea Hard-Core Switch

8. victorrentea.ro @victorrentea Hard-Core Switch

9. victorrentea.ro @victorrentea Let's CODE !! 9 I'll push everything here: https://github.com/victorrentea/functional-patterns-devoxx-uk

10. victorrentea.ro @victorrentea

11. victorrentea.ro @victorrentea The Clean Code Rules Applied to Java 8 11

12. victorrentea.ro @victorrentea Descriptive Names Best Lambdas are fit, thin one-liners Extract heavy lambdas into named ::methods  in the same class  in the item class  as static methods -> {a-nonymous functions 12 Lambdas

13. victorrentea.ro @victorrentea Stream Wrecks 1 usecase = 1 single chain of 30 function calls. Don't do that ! We beg you ! We have children, families,… Break them using explanatory variables Small Methods Five Lines 13

14. victorrentea.ro @victorrentea Optional Instead: thatOpt.map(myFunction) No NullableParameters Avoid Returning Null,Throw Ex … or return an Optional PS: don't be afraid of Orcs, Monads, or .flatMap 14

15. victorrentea.ro @victorrentea Passing-a-Block Pass logic to your function The Funeral of Template Method™ 15

16. victorrentea.ro @victorrentea Loan Pattern You work with a resource that is managed for you Decouples real logic from infra code 16

17. victorrentea.ro @victorrentea Execute Around Pattern Explicit AOP ~ Proxy™ or Decorator™ 17

18. victorrentea.ro @victorrentea Avoid Checked Exceptions java.util.function interfaces don't declare any throws Which is good ! You must suffer if you work with non-Runtime Exceptions! But if you insist: - Define throwing functional interfaces - Use libraries: jool, vavr... 18

19. victorrentea.ro @victorrentea Type-specific Logic switch Switch Hunt Day® Hope to find them all: JDD Simplest to Read 1 switch = 1 method case XX: return … OOP Extends is BAD ONE Shot Children90Movie enum Isolated Logic In enum methods Logic with Dependencies Function references on enums (bean passed as param) 19

20. victorrentea.ro @victorrentea Thank You! 20 Disclaimer: The use of ® or ™ is the slides is only anecdotic. So good we can ask more explanations after the Pizza What was that??

21. victorrentea.ro @victorrentea Thank You! 21 Disclaimer: The use of ® or ™ is the slides is only anecdotic. victor.rentea@gmail.com www.VictorRentea.ro Let's Chat:

22. victorrentea.ro @victorrentea Thank You! I'm available a statement of seniority I use both hemispheres Tough meetings? Abused estimates? Purpose of code: 1. Maintainable -- Uncle Bob Functional Party Activist Stay into The Light I brought you some Motivational Stickers In-house/remote training or coaching? What do You want us to do the second hour? (after the Pizza) victorrentea.ro/vote.html Dissect some examples Basic Java8 Tutorial (Slow-motion) Mocking Kata TDD Kata Spring @Transactional victor.rentea@gmail.com www.VictorRentea.ro

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