Functional Patterns with Java8 at Devoxx UK - Slides

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The backing slides for my live coding session at Devoxx UK London 2018. Summarizing all the conclusions. A summary of how to apply clean code principles in Java8 code.

Logiciels

@victorrentea
Functional Programming Patterns with Java 8
Victor Rentea
IBM Architect & Independent Trainer
victorrentea.ro
All the commits will be pushed to
https://github.com/victorrentea/functional-patterns-devoxx-uk

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 Krakow Vienna Sofia Casablanca Bucharest Iasi Belgrade Kiew Barcelona

#DevoxxUK @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:

#DevoxxUK @victorrentea
Not Convinced?
6

#DevoxxUK @victorrentea
Hard-Core Switch

#DevoxxUK @victorrentea
Let's CODE !!
10
I'll push everything here:
https://github.com/victorrentea/functional-patterns-devoxx-uk

#DevoxxUK @victorrentea
The Clean Code Rules
Applied to Java 8
12

#DevoxxUK @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
13
Lambdas

#DevoxxUK @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
14

#DevoxxUK @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
15

#DevoxxUK @victorrentea
Passing-a-Block
Pass logic to your function
The Funeral of Template Method™
16

#DevoxxUK @victorrentea
Loan Pattern
You work with a resource
that is managed for you
Decouples real logic from infra code
17

#DevoxxUK @victorrentea
Execute Around Pattern
Explicit AOP
~ Proxy™ or Decorator™
18

#DevoxxUK @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...
19

#DevoxxUK @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)
20

#DevoxxUK @victorrentea
Thank You!
21
Disclaimer: The use of ® or
™ is the slides is only
anecdotic.
So good
it was all
recorded!
!What was
that??

#DevoxxUK @victorrentea
Thank You!
22
Disclaimer: The use of ® or
™ is the slides is only
anecdotic.
@victorrentea
victor.rentea@gmail.com
www.VictorRentea.ro
Let's Chat:

#DevoxxUK @victorrentea
Thank You!
23
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
@victorrentea
victor.rentea@gmail.com
www.VictorRentea.rocome and grab
yours
If you really-really liked it:
http://victorrentea.ro#recommend
In-house /remote
training or coaching?

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Tests are hard to write if the production design is crappy - goes an old saying. Indeed, writing unit tests gives you one of the most comprehensive, yet brutal, feedback about the design of your production code, but if it comes too late, many developers can’t take it and they will either stop testing or test superficially. At the other end, others struggle to write contrieved, fragile tests full of mocks that end up frustrating more than helping them. This talk reviews the main hints that unit tests provide you, from the most obvious improvements to some of the most subtle design principles.

Unit testing - 9 design hints

Victor Rentea

Our sleep is better with longer-scoped tests. Our life is brighter if we don’t rely heavily on fine-grained tests that break whenever we refactor even the smallest detail. I’m talking about tilting the balance towards more integration than unit testing. And for that, let’s look at the testing features offered by the most used Java Framework today. We’ll see how to write fake test implementations, how to mock an unwanted Spring bean, what a Transactional Test is, and if and how to test your web endpoints. Along the way, we’ll also see Flaky tests, and discuss best practices about integration testing – all in an entertaining live coding session. Your takeaways from this talk will be a lot of good practices and techniques directly applicable to your day-to-day project.

Integration testing with spring @JAX Mainz

Victor Rentea

Integration testing with spring @snow one

Victor Rentea

aaaaThis presentation focuses on two of the most advanced design tools in your toolbox, whatever the language or framework you might be using. After understanding the basics, we'll see how these concepts can be used in real-world scenarios to simplify those several most complex use-cases in your application. At the end of a mix of slides and live-coding, you'll finally understand the power of these ideas and become prepared to apply them in your day-to-day work. Along the way, we'll introduce concepts like Side Effects, Idempotency, Referential Transparency, Pure Functions and Deep/Shallow Immutability. Also, we'll talk about the powerful Functional Code / Imperative Shell architecture that you can use for your complex workflows. Prepare for an entertaining, highly interactive session that will answer all your questions. Written in Java and spoken in English.

Pure functions and immutable objects @dev nexus 2021

Victor Rentea

Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...

Victor Rentea

Do you ❤️ Mocks? When you write your first unit tests, especially on older codebases, mocking foreign code is key to survival. But as you grow older in the craft, you start piling up hours and days wasted to refactor fragile tests or to fix bugs that those heavy mock-based tests didn't catch. And so you start looking at Mocks differently. Let's go through the key factors to consider to strike the optimal balance between what needs to be mocked away and what code should be tested in integration. There's sometimes a fine line there, often interwoven with strong emotions: "Why am I testing this?" "Argh… these tests take too long" "Can this ever really break?" etc... Among the points that we'll touch on: - Mocks vs Refactoring - Mocks vs Reliability - Fine vs Coarse Mocks - Reproducibility - Partial Mocks - Mocking Statics - Alternatives to Mocks Speakers: Victor Rentea Victor is a Java Champion and Independent Trainer with an impressive experience: thousands of developers in dozens of companies trained in dedicated company sessions. He is the founder of one of the largest developer communities in Romania, Bucharest Software Craftsmanship Community and a top international conference speaker. To find more about him, join a live masterclass or call him in for a company dedicated training: victorrentea.ro

Don't Be Mocked by your Mocks - Best Practices using Mocks

Victor Rentea

First, what are they? And why they are important? What do they allow us to do, and what problems do they shield us from? After this talk, you'll inevitably fall in love with pure functions and immutable objects. We'll see how to implement them in Java, in the most geek ways possible, concerned about long-term maintainability of the code. Oh, and we'll also have Lombok and records along the way, plus lots of fun while tasting a bit of "a senior developer's night-life". Given at jLove Dec 2020

Pure Functions and Immutable Objects

Victor Rentea

Exceptions have been with us for 25 years in Java but have we learned to use them properly? Are checked exceptions a mistake? Should you use throw runtime or checked exceptions? And what to do with a checked exception, when you get one? And how to slay the boss of all exceptions: the NullPointerException. Let’s put these old questions in the context of Java8+ lambdas, Vavr monads, Lombok, Spring, JAX-RS and other modern frameworks, and see the best practices of handling errors in Java today.Let’s put these old questions in the context of Java8+ lambdas, Vavr monads, Lombok, Spring, JAX-RS and other modern frameworks, and see the best practices of handling errors in Java today.

Definitive Guide to Working With Exceptions in Java

Victor Rentea

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This presentation covers the following topics: What is logging? The purpose of logging: Debugging The purpose of logging: Security The purpose of logging: Stats & analytics Traditional logging Traditional logging: Advantages Traditional logging: Disadvantages The solution: Large-scale logging Large-scale logging: Core principles Large-scale logging: Solution types Large-scale logging: Cloud vs on-prem Large-scale logging: Operational complexity Large-scale logging: Security Large-scale logging: Costs Large-scale logging: On-prem comparison - Elasticsearch - Grafana Loki - VictoriaLogs On-prem comparison: Setup and operation On-prem comparison: Costs On-prem comparison: Full-text search support On-prem comparison: How to efficiently query 100TB of logs? On-prem comparison: Integration with CLI tools VictoriaLogs for large-scale logging VictoriaLogs demo instance - Ingestion rate: 3600 messages / minute - The number of log messages: 1.1 billion - Uncompressed log messages’ size: 1.5TB - Compressed log messages’ size: 23GB - Compression ratio: 47x - Memory usage: 150MB VictoriaLogs CLI integration demo - Which errors have occurred in all the apps during the last hour? - How many errors have occurred during the last hour? - Which apps generated the most of errors during the last hour? - The number of per-minute errors for the last 10 minutes - Status codes for the last hour - Non-200 status codes for the last week - Top client IPs for the last 4 weeks with 404 and 500 response status codes - Per-month stats for the given IP across all the logs Large-scale logging solution MUST provide excellent CLI integration VictoriaLogs: (temporary) drawbacks VictoriaLogs: Recap - Easy to setup and operate - The lowest RAM usage and disk space usage (up to 30x less than Elasticsearch and Grafana Loki) - Fast full-text search - Excellent integration with traditional command-line tools for log analysis - Accepts logs from popular log shippers (Filebeat, Fluentbit, Logstash, Vector, Promtail, Grafana Agent) - Open source and free to use!

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At the recent Microsoft Ignite 2023 conference, Microsoft unveiled a groundbreaking strategy that will redefine enterprise work management. The plan involves integrating Microsoft’s key planning tools, Microsoft To Do, Microsoft Planner, and Microsoft Project for the web into a unified experience called “Microsoft Planner.” What does this new strategy from Microsoft mean for current users? Join us and learn how best to take advantage of this announcement while gaining a clear path on how to elevate the current state of Microsoft Planner from a basic task manager to a comprehensive tool for Enterprise Work Management using OnePlan. Learn how OnePlan’s integration with Microsoft Planner allows for strategic alignment with business goals through advanced features like strategic planning, portfolio management, resource management, financial management, and more!

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In today's dynamic e-commerce landscape, the payment gateway emerges as a linchpin, ensuring smooth and secure transactions between buyers and sellers. In this discourse, we delve into the meticulous process of devising test cases tailored for scrutinizing payment gateways. Crafting precise test cases for payment gateways is a quintessential responsibility for testers operating within the service industry. This article meticulously explores pivotal scenarios integral to how to test payment gateways, coupled with essential guidelines for drafting effective test cases.

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The fast-paced world of Agile development just got a turbo boost! Dive into this engaging talk on "Innovation at Speed: ChatGPT & the AI Transformation in Agile Development." Over the last few months, AI, including notable tools like Google Bard and Microsoft Co-Pilot, has been leveraged to supercharge Agile workflows. In this session, attendees will get an overview of the current AI landscape and its impact on development. They will learn why AI is the game-changer needed to embrace in the Agile lifecycle, offering that elusive X factor to multiply productivity. Real-world examples will be presented, and the challenges of implementing AI tools like ChatGPT within corporate environments will be discussed.

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