Clean Code with Java 8 - Functional Patterns and Best Practices

•Als PPTX, PDF herunterladen•

4 gefällt mir•2,624 views

My talk about how the Clean Code principles and techniques apply/change when you start using functional programming with Java 8. Presented in Paris at Devoxx FR 2018

Software

#DevoxxFR @victorrentea
Clean Code with Java 8
Functional Patterns and Best Practices
- live coding marathon -
Victor Rentea
VictorRentea@gmail.com
www.VictorRentea.ro
1

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

#DevoxxFR @victorrentea
 Spring
 Hibernate
 Clean Code, Architectures
 Java 8, Design Patterns
 Unit Testing
 Java Performance
 Scala & more...
Independent
Technical Trainer
VictorRentea@gmail.com VictorRentea.ro
1000+ developers
1500+ hours
since 2013
tough clients:

#DevoxxFR @victorrentea
Not Convinced?
5

#DevoxxFR @victorrentea
Let's CODE !!
9
I'll push everything here:
https://github.com/victorrentea/clean-code-java8-devoxxfr

#DevoxxFR @victorrentea
The Clean Code Rules
Applied to Java 8
11

#DevoxxFR @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

#DevoxxFR @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

#DevoxxFR @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

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

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

#DevoxxFR @victorrentea
Execute Around Pattern
Explicit AOP
~ Proxy™ or Decorator™
17

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

#DevoxxFR @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

#DevoxxFR @victorrentea
Merci
20
@victorrentea
VictorRentea@gmail.com
www.VictorRentea.ro
Disclaimer: The use of ® or
™ is the slides is only
anecdotic.
Let's Chat:

Weitere ähnliche Inhalte

Was ist angesagt?

TDD Mantra

Victor Rentea

In our quest against increasing complexity, Extract Method is probably the most important refactoring technique in our hands. We use it a dozen times per day as a first-level weapon, and very often it leads to us to deeper design insights. Let’s look at several such further actions you might take after pulling some code out in a separate method: * Reorder Parameters * Remove parameters by including more lines in what you extract (Ctrl-Z) * Add parameters for reuse by extract/inline variable at call site (Ctrl-Z) * Move method to object (for Feature Envy) * Encapsulate conditionals (great with Java8) * Inline back * Distill switch expressions: the 3 Clean Switch Rules * Introduce Method Object for heavy logic * Early return errors * Extract static util functions * Spawn smart Value Object vs logic in Utils * Extract’n-test then mock away, leading to Separation by Layers of Abstraction * Command-Query Separation: mind the side effects * Extract again - boolean vs SRP * Wrap call to safely add more code (Open-Closed)

Refactoring Games - 15 things to do after Extract Method

Victor Rentea

The only way to survive in a codebase is by refactoring continuously. We know that since the Extreme Programming days. But what stops us from doing so today? In this talk, Victor summarizes what he learned discussing Clean Code and Refactoring with hundreds of teams throughout the world. You'll find ideas to tackle a broad spectrum of factors: technical, cultural, psychological, emotional, social, and even political. Using these you might unlock the freedom to refactor for you and your colleagues. After this roundtrip, the talk briefly overviews several of the most dangerous code smells in the projects today: God Class, Duplicated Code vs Divergent Code, Temporal Coupling, Middle Man, Speculative Generality, Mutable Long-Lived State, Comments, and more. For each of them we’ll discuss a typical workaround, plus several subtleties and variations.

Refactoring blockers and code smells @jNation 2021

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

Talk given at Devoxx Belgium 2019. ===== Abstract ===== Are you in a mood for a brainstorm? Join this critical review of the major decisions taken in a typical enterprise application architecture and learn to balance pragmatism with your design goals. Find out how to do just-in-time design to keep as many use-cases as simple as possible. The core purpose of this presentation is to learn to strike a **balance between pragmatism and maintainability** in your design. Without continuous refactoring, a simple design will inevitably degenerate into a Big Ball of Mud, under the assault of the new features and bugfixes. On the other hand, the very highly-factored code can burden the take-off of the development and end up freezing the mindset in some rigid upfront design. The end goal of this talk is to challenge you to rethink critically the architecture of your systems and seek ways to simplify it to match your actual needs, with a pragmatic mindset. "Architecture is the art of postponing decisions", said Uncle Bob. This talk takes this idea further and explains an optimal mindset about designing enterprise applications: Evolving (Continuously Refactoring) a Pragmatic (Simple), Clean (aka Onion) Architecture, aiming to provide Developer Safety™️ and Comfort™️. It’s the philosophy that Victor distilled over the past 5 years, designing and implementing 9 applications as IBM Lead Architect, and delivering training and advises to many other companies. You’ll learn how to break data into pieces (Fit Entities, Value Objects, Data Transfer Objects), how to keep the logic simple (Facades, Domain Services, logic extraction patterns, Mappers, AOP), layering to enforce boundaries (keeping DTOs out of your logic, Dependency Inversion Principle), and many more, all in a dynamic, interactive and extremely entertaining session.

Evolving a Clean, Pragmatic Architecture - A Craftsman's Guide

Victor Rentea

Hibernate and Spring - Unleash the Magic

Victor Rentea

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

Victor Rentea

The Art of Clean code

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

Slides of the Talk I gave at Devoxx Belgium 2019. === Abstract === Focusing on the creative work without being terrified of breaking the existing behavior can make software development very addictive! Good automated tests can buy you that! However, if your tests are not maintainable they may end up slowing you down and causing you painful headaches, compilation errors and spurious failures. To avoid that, your unit tests should be significant; expressive; clean; DRY; non-overlapping; and blazing fast. Writing good tests becomes the toughest challenge for any developer, no matter how battle-hardened: you need to balance risk with test maintenance costs, while looking out for test design smells that call for [risky] refactoring to drive your design towards a set of key principles (included:). Principles that will end up shaping the way you craft the Production code itself. Because in the end, a good, clean design is more important than coverage%. But testing gives you the best feedback to get there. Grab a black coffee and join this snippet from Victor’s Pro Unit Testing #training, to learn about testing priorities, buggy tests, the shared @Before, Mocks vs Stubs and how to reduce them by "purifying" your logic, testing Legacy Code and refactoring @Spy-es out. All of that in an entertaining, dynamic and memorable session.

The Art of Unit Testing - Towards a Testable Design

Victor Rentea

Clean Pragmatic Architecture - Avoiding a Monolith

Victor Rentea

Decades ago, IT started as a single engineering practice, but as time passed by it got increasingly fragmented. Conflicts broke out between testers vs developers vs sysadmins vs DBAs vs many other roles. Recently, developers themselves split into many subspecialties like backend/frontend/iOS/Android/microservices/functions/etc. The overspecialization we face today is a rich source of communication overhead, a low bus factor, lack of responsibility, blaming, repeated isolated patching and fulminating costs. More than a ‘full-stack’ developer, a software craftsperson distinguishes oneself by acting professionally and taking responsibility for as many aspects of one’s work. Jump on this never-ending journey of continuous improvement and decide what’s the next level for your own case. For a company/individual training, check out my website: victorrentea.ro

Extreme Professionalism - Software Craftsmanship

Victor Rentea

You can only claim you know Spring if you fully understand the Proxy design pattern and how the framework uses it to do its magic. Join this live coding session to explore 6 ways of intercepting method calls that you can use to cast your own spells and dramatically simplify your codebase. Grab a strong coffee and prepare yourself for a whirlwind of **live-coding**, interwoven with **deep theoretical concepts and implementation details** that you need to master if you are using the Spring Framework. We’ll start from a Decorator pattern implementation, proving 2 ways to wire it with Spring, then move to bare-hands interface proxies, concrete classes proxies, @Aspect applied to custom annotations, plus some standard off-the-shelf Spring aspects. Join this talk and learn real-world best practices to use with Aspects, design hints, under-the-hood implementation details, debugging tips, and performance impact of aspects. All in an interactive, entertaining, and extremely dynamic session.

The Proxy Fairy and the Magic of Spring @JAX Mainz 2021

Victor Rentea

Decades ago, IT started as a single engineering practice, but as time passed by it got increasingly fragmented. Conflicts broke out between testers vs developers vs sysadmins vs DBAs vs many other roles. Recently, developers themselves split into many subspecialties like backend/frontend/iOS/Android/microservices/functions/etc. The overspecialization we face today causes huge communication overhead, a low bus factor, lack of responsibility, blaming, repeated isolated patching and fulminating costs. The software craftsmanship movement is rising in this post-agile world with professionals eager to take control of their careers and continuously learn in the pursuit of mastery. This talk will show you practical ways in which to seed a continuous learning culture in your team or company, and foster the enthusiasm of your developers.

Extreme Professionalism - Software Craftsmanship

Victor Rentea

Clean pragmatic architecture @ devflix

Victor Rentea

A Tale About the Evil Partial Mock and Separation by Layers of Abstractions

Victor Rentea

Clean Lambdas at JBCNConf by Victor Rentea

Victor Rentea

The goal of architecture is to simplify the most complex parts of your logic. Any other goal should be secondary to this. The problem is that you can’t always anticipate where the complexity of your application will accumulate, especially when confronted with ever-changing requirements. The only way to keep your code simple is to gradually evolve the architecture without adding useless complexity up front, but always looking out for opportunities to break-down and refactor towards the most simple design that solves the problem. Drawing concepts from the Domain-Driven Development mindset, this talk summarizes the most important lessons learned designing and consulting many real-world projects. Along the way, you’ll hear about Value Objects and Entities, DTOs, Dependency Inversion Principle, Facades, the Onion Architecture and many pragmatic tips and tricks immediately applicable to your day-to-day work.

Clean architecture - Protecting the Domain

Victor Rentea

Functional Programming Patterns with Java 8 (at Devoxx BE)

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

Was ist angesagt? (20)

TDD Mantra

Refactoring Games - 15 things to do after Extract Method

Refactoring blockers and code smells @jNation 2021

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

Evolving a Clean, Pragmatic Architecture - A Craftsman's Guide

Hibernate and Spring - Unleash the Magic

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

The Art of Clean code

Pure Functions and Immutable Objects

The Art of Unit Testing - Towards a Testable Design

Clean Pragmatic Architecture - Avoiding a Monolith

Extreme Professionalism - Software Craftsmanship

The Proxy Fairy and the Magic of Spring @JAX Mainz 2021

Extreme Professionalism - Software Craftsmanship

Clean pragmatic architecture @ devflix

A Tale About the Evil Partial Mock and Separation by Layers of Abstractions

Clean Lambdas at JBCNConf by Victor Rentea

Clean architecture - Protecting the Domain

Functional Programming Patterns with Java 8 (at Devoxx BE)

Integration testing with spring @JAX Mainz

Ähnlich wie Clean Code with Java 8 - Functional Patterns and Best Practices

Clean Code principles have become a cornerstone of professional developer teams worldwide. But frameworks and languages have evolved, and so have the challenges we’re facing today while crafting modern applications. Single-page apps, extremely DRY code, microservices, excessive functional programming, and reactive flows have all taken their toll on our code quality. Hop aboard this roundtrip of the most damaging Code Smells as of 2023 and fill your toolbox with a load of practical tricks you can immediately apply to your day-to-day work. All in an entertaining show spiced with live-coding moments.

Clean Code @Voxxed Days Cluj 2023 - opening Keynote

Victor Rentea

This is a toy compiler for the course Compiler 2016 at ACM Class, SJTU. The source language is Mx*. The target is MIPS assembly (in SPIM format). You can refer to my presentation slides to know something about this compiler and also what I've learnt during the course. Github: https://github.com/abcdabcd987/compiler2016 When debugging this compiler, I wrote another project LLIRInterpreter(https://github.com/abcdabcd987/LLIRInterpreter) which reads text IR and does interpretation.

Compiler2016 by abcdabcd987

乐群陈

Metaprogramming - the process of using code to write code - is a core feature of Elixir. You can easily extend the language and dynamically change the code. Despite knowing the first rule of metaprogramming - "Don't use metaprogramming" - every Elixir developer should have an idea what it is. This talk will introduce the audience to the main metaprogramming concepts of Elixir. You will know about Elixir abstract syntax tree, 'quoting', macros and compile-time hooks. I'll demonstrate how this stuff works using simple examples as well as cases from popular packages. First Kyiv Elixir Meetup, June 23

Intro to elixir metaprogramming

Anton Mishchuk

JUG Münster 2014 - Code Recommenders & Codetrails - Wissenstransfer 2.0

Marcel Bruch

java8-patterns

Justin Lin

What does GraphQL and Traditional REST API have in common? Shouldn't the GraphQL be connected to some graphs or similar? What is actually GraphQL all about? Join me in this talk, while I try to answer all this questions and much more. In this talk I will explain what GraphQL is, what are differences and similarities compared to more traditional REST API and show you this on working examples, since code worth more then words only ;)

Devoxx France 2018 GraphQL vs Traditional REST API

Vladimir Dejanovic

Microservices need to support many programming languages, requiring both a language-agnostic network protocol and a polyglot runtime environment. In addition, microservices written in one language may need to use APIs written in some other language. Using a traditional CRUD application implemented as a polyglot solution (Java, JavaScript, Python and Ruby) on GraalVM, this presentation demonstrates how MicroProfile JWT, MicroProfile Metrics, MicroProfile Rest Client, MicroProfile Health Check, and more can provide architecture-level interoperability across concerns.

GraalVM and MicroProfile - A Polyglot Microservices Solution

Roberto Cortez

Bugs are a daily cause of stress in our work as Java developers. Those pesky things can hide behind core concepts in Java 9 and 10—there is no way out of this. If we don’t keep up to date with new Java versions, bugs will take over our projects. But can we have fun hunting them? You bet! How about solving a series of Java puzzles as a way to master concepts and save a lot of time finding those tricky bugs? In this session, attendees can help the bug hunters solve fun Java challenges, gain a clear understanding of what causes the most-stressful bugs—and have fun eliminating them from projects.

Master the Concepts Behind the Java 10 Challenges and Eliminate Stressful Bugs

Rafael Chinelato Del Nero

Building frameworks: from concept to completion

Ruben Goncalves

Power Leveling your TypeScript

Offirmo

The Mayans Lost Guide to RxJava on Android

Fernando Cejas

The Evolution of Async-Programming on .NET Platform (.Net China, C#)

jeffz

Need 4 Speed FI

Marcel Bruch

DevoxxFR17 - Préparez-vous à la modularité selon Java 9

Alexis Hassler

Devoxx17 - Préparez-vous à la modularité selon Java 9

Alexis Hassler

Dmytro Kochergin Angular 2 and New Java Script Technologies

LogeekNightUkraine

The Internet is asynchronous, people are asynchronous, the universe is asynchronous. They are now and they always will be. Writing applications which deal correctly with asynchronous data is difficult. Or at least it was. Microsoft open sourced ReactiveX in 2010 to make what used to be some of the hairiest kinds of coding almost easy. The project was so well received that it has been ported to nearly every major programming language. Versions of ReactiveX exists for .NET, JavaScript, Java, Scala, Clojure, C++, Ruby, Python, Groovy, JRuby, Kotlin, and Swift. The project is open source and community maintain with corporate backing from the likes of Microsoft and Netflix. Microsoft created the ReactiveX, then called reactive extensions, from the burnt out remains of Project Volta. Project Volta's goal was to extend .NET's to run both on the server and in the browser. A compiler would decide which parts were best to put where. It essentially was the Meteor framework in 2007. In this talk we will take a deep look at ReactiveX. We will use code samples to show how things are done before and after ReactiveX. The code will be in C# and JavaScript. We will see how ReactiveX makes our lives as developers easier and our code more reactive.

A Quick Intro to ReactiveX

Troy Miles

FlawDetector - Rubykaigi2013 LT

ginriki

Debugging with VS2019

Mirco Vanini

OWF12/PAUG Conf Days Dart a new html5 technology, nicolas geoffray, softwar...

Paris Open Source Summit

Ähnlich wie Clean Code with Java 8 - Functional Patterns and Best Practices (20)

Clean Code @Voxxed Days Cluj 2023 - opening Keynote

Compiler2016 by abcdabcd987

Intro to elixir metaprogramming

JUG Münster 2014 - Code Recommenders & Codetrails - Wissenstransfer 2.0

java8-patterns

Devoxx France 2018 GraphQL vs Traditional REST API

GraalVM and MicroProfile - A Polyglot Microservices Solution

Master the Concepts Behind the Java 10 Challenges and Eliminate Stressful Bugs

Building frameworks: from concept to completion

Power Leveling your TypeScript

The Mayans Lost Guide to RxJava on Android

The Evolution of Async-Programming on .NET Platform (.Net China, C#)

Need 4 Speed FI

DevoxxFR17 - Préparez-vous à la modularité selon Java 9

Devoxx17 - Préparez-vous à la modularité selon Java 9

Dmytro Kochergin Angular 2 and New Java Script Technologies

A Quick Intro to ReactiveX

FlawDetector - Rubykaigi2013 LT

Debugging with VS2019

OWF12/PAUG Conf Days Dart a new html5 technology, nicolas geoffray, softwar...

Mehr von Victor Rentea

The network is reliable, has zero latency, with infinite, free bandwidth... And then you wake up. The plan was to go to microservices to build those reliable, super-scalable systems you saw in the ad. But your systems only communicate over synchronous protocols and the team never had a serious discussion about timeouts, retries, circuit breakers, and bulkhead patterns. If that’s your crude reality, please attend this session!

Microservice Resilience Patterns @VoxxedCern'24

Victor Rentea

One of the many challenges of a distributed architecture is preserving the consistency of data across different systems. During this one-hour presentation, we are going to explore a number of strategies for maintaining consistency, going from the most basic options up to an automated recovery mechanism using compensations and reservations - what’s commonly referred to as a “saga” pattern. Our journey will be based on a hypothetical food delivery application on which we will analyze various decisions and their tradeoffs. The discussion will stay at an abstract, architectural level for the most part, with only a few code examples. In the agenda: - Idempotency and Retries - 2 Phase Commit - Eventual Consistency - Compensations - Reservations - The Saga Pattern

Distributed Consistency.pdf

Victor Rentea

Testing strategies for modern software architectures are evolving. As we transition from monolithic structures to team-sized microservices with crisp APIs aligned to bounded contexts, we encounter more stable testing surfaces. This shift leads many high-performing teams to favor integration tests over fine-grained, brittle unit tests. These integration tests, which are closer to the functional requirements, prove more trustworthy and are more resilient to internal refactoring, though they may come with a higher cost. In a vivid and engaging style, this talk addresses the primary challenges of integration testing in the microservices era: cognitive overload, test isolation, and test execution speed. Join the testing revolution and discover how to enhance your team's testing efficiency and effectiveness.

Testing Microservices @DevoxxBE 23.pdf

Victor Rentea

Ready for a deep dive into the world's most challenging programming paradigm? Reactive programming can simplify asynchronous and event-driven applications, but without a strong understanding, it can lead to frustration, recurring patchwork, missed deadlines, and costly bugs. In this intensive three-hour session, we'll transition a traditional Spring application to WebFlux, revealing patterns and aanti-patterns when working with repositories, REST APIs, queues, and legacy libraries. You'll gain a clear understanding of often overlooked but critical aspects like subscribe signal, errors, cancellation, and signal loss. As a bonus, we'll debate the future of Reactive vs Virtual Threads, production-ready in Java 21. This session is crucial for developers already working with reactive programming or those intending to make the leap.

From Web to Flux @DevoxxBE 2023.pptx

Victor Rentea

Testing is fundamental in software development. Quality gates demand high coverage levels, pull requests need sufficient tests, leading to teams spending considerable time writing and maintaining them. But are we using our tests to their full potential? 'If code is hard to test, the design can be improved'. Starting from this mantra, this deep-dive session unveils hints to simplify code, break-down complexity, and effectively use functional programming. We'll delve into topics like fixture creep, partial mocks, onion architecture, and pure functions, providing numerous best practices and practical tips for your testing. Be warned: This session may significantly disrupt your work routine and will likely change how you see testing. Attend at your own risk.

Test-Driven Design Insights@DevoxxBE 2023.pptx

Victor Rentea

The biggest challenge in performance tuning is identifying the root cause of the bottleneck. Once you find it, the fix often becomes trivial. However, this detective work takes patience, skills, and effort, so we often attempt to guess the cause, by trying out tentative fixes. The result: messy code, waste of time and money, and frustration. During this talk you will learn how to correctly zoom in on the bottleneck using three levels of profiling: distributed tracing with Zipkin, metrics with Micrometer, and profiling with the Java Flight Recorder already built into your JVM. We’ll focus on the latter and learn how to read a flame graph to trace some common issues of backend systems like connection/thread pool starvation, time-consuming aspects, hot methods, and lock contention, even if these occur in library code you did not write.

Profiling your Java Application

Victor Rentea

OAuth in the Wild

Victor Rentea

If tests are hard to write, 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 stand it anymore and they will either stop testing or test more superficially. At the other extreme, others struggle to write contrived, 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.

The tests are trying to tell you something@VoxxedBucharest.pptx

Victor Rentea

Throughout the years, the Concentric Architectures (Onion, Hexagonal, Clean-..) have grown into the undisputed leader among backend systems architectures. With the rise of Domain-Driven Design, keeping your Domain ring 'agnostic' to the outside world has become the norm today. But history proved that any 'norm' in software architectures will cause overengineering if applied without criticism. After a brief recap of these architectures, their pitfalls, and weaknesses, we'll see two alternatives that segregate code not in 'layers' or 'rings' but in vertical slices: Feature Slicing and Modular Monolith. [Feature Slicing](vertical Slice Architecture) (aka *UseCase) has its own pitfalls and weaknesses, that we'll briefly review. But this will just warm us up for the next style. Modular Monolith (aka Modulith) is an architecture style that helped many companies break their legacy codebases, and smoothly move to microservices. Most of the techniques discussed here can also come handy when one single microservice grew big and needs to be broken down. Even more, greenfield projects today opt for this architecture instead of microservices, to avoid paying the high cost of distributability. Imagine cohesive but decoupled modules living in the same code base & deployment, but on which different teams work in harmony, delivering more value much faster than an equivalent microservice ecosystem.🦄 On the agenda: - patterns to break data structures - how to protect Domains inside modules - communication patterns between modules - breaking cyclic dependencies

Vertical Slicing Architectures

Victor Rentea

Decades ago, IT started as a single engineering practice, but over the years it grew increasingly fragmented. The overspecialization we face today, in the context of a management-first agile transformation leads to a lack of responsibility, blaming games, repeated patching, painful communication overhead, and fulminating costs. The software craftsmanship movement is rising in this post-agile world with professionals that take control of their careers and continuously learn in the pursuit of mastery. But changing mindset requires determined team efforts and communities, especially when working remotely. What techniques and tricks can you use to grow such a culture of learning in your team? Find out from the founder and lead of one of the largest software craftsmanship communities in the world. This talk is about technical culture and attitude.

Software Craftsmanship @Code Camp Festival 2022.pdf

Victor Rentea

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

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

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

Engaging Isolation - What I've Learned Delivering 250 Webinar Hours during CO...

Victor Rentea

Mehr von Victor Rentea (14)

Microservice Resilience Patterns @VoxxedCern'24

Distributed Consistency.pdf

Testing Microservices @DevoxxBE 23.pdf

From Web to Flux @DevoxxBE 2023.pptx

Test-Driven Design Insights@DevoxxBE 2023.pptx

Profiling your Java Application

OAuth in the Wild

The tests are trying to tell you something@VoxxedBucharest.pptx

Vertical Slicing Architectures

Software Craftsmanship @Code Camp Festival 2022.pdf

Unit testing - 9 design hints

Integration testing with spring @snow one

Pure functions and immutable objects @dev nexus 2021

Engaging Isolation - What I've Learned Delivering 250 Webinar Hours during CO...

Kürzlich hochgeladen

introduction-to-automotive Andoid os-csimmonds-ndctechtown-2021.pdf

VishalKumarJha10

VTU technical seminar 8Th Sem on Scikit-learn

AmarnathKambale

MarTech Trend 2024 Book : Marketing Technology Trends (2024 Edition) How Data...

Jittipong Loespradit

10 Trends Likely to Shape Enterprise Technology in 2024

Mind IT Systems

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!

Introducing Microsoft’s new Enterprise Work Management (EWM) Solution

OnePlan Solutions

InShot proinshot.com stands tall among its peers as the ultimate video editing app, offering simplicity, versatility, and power in one package. With its intuitive interface and comprehensive feature set, InShot caters to both beginners and seasoned editors alike. Whether you're creating content for social media, YouTube, or personal projects, InShot empowers you to unleash your creativity and transform your videos into captivating masterpieces. Join the millions of users who trust InShot https://www.proinshot.com/ for all their video editing needs and discover the difference for yourself!

Exploring the Best Video Editing App.pdf

proinshot.com

Craft an AI & Machine Learning Pitch with our Editable Professional PowerPoint Template. Ignite your AI & Machine Learning pitch with our cutting-edge PowerPoint template tailored for the industry. Perfect for AI conferences, investor presentations, sales pitches to tech-focused companies, training sessions, and educational programs. - 20+ editable slides: Get a variety of options to choose from for your presentation. - Time-saving solution: Download, replace text/images with a few clicks. - User-friendly customization: Easy to use and personalize. - Modern and attractive design: Captivating visuals, sleek layout. - Tailored to your requirements: Fully alterable for customization. - Well-organized slides: Complete control over content. - Thematic specificity: Reflects healthcare industry with relevant graphics. - Showcase your business idea: Communicate value proposition effectively.

AI & Machine Learning Presentation Template

Presentation.STUDIO

Many specialized tools cater to distinct stages within the software development lifecycle (SDLC). These tools target various aspects of development, delivery, and operations, each with its unique strengths. Uniting these diverse testing needs into a single continuous testing platform presents several challenges. Such a platform must seamlessly integrate with various development tools and environments, accommodate different testing methodologies, and remain flexible to adapt to organizational processes and quality standards.

The Guide to Integrating Generative AI into Unified Continuous Testing Platfo...

kalichargn70th171

Technology has taken up space all over the world. From generating content with a single command on ChatGPT to getting your food served by Robots at your favorite restaurant, artificial advancements have ruled every space. Every industry is set to develop top-notch technology in every sector; finance, IT, healthcare, gaming, and banking, with competitive market standards. One of these rapidly growing industries is Mobile App Development. According to the Straits Research report, it is expected to reach USD 583.03 billion at a CAGR OF 12.8% between (2022 and 2030). It clearly shows how mobile app development has become an integral part of the digital landscape and revolutionized technology.

The Top App Development Trends Shaping the Industry in 2024-25 .pdf

ayushiqss

%in kaalfontein+277-882-255-28 abortion pills for sale in kaalfontein

masabamasaba

Conference: Engage2024 in Antwerp Type: Workshop Speakers: Florian Vogler, Henning Kunz, Christoph Adler Title: Navigating the Future with The Hitchhiker's Guide to Notes and Domino 14 Abstract: Embark on an exhilarating journey with industry trailblazers Florian Vogler, Henning Kunz, and Christoph Adler in this not-to-be-missed workshop at the forefront of the tech universe. Get ready for a thrilling kick-off as we navigate the current state of the HCL universe, setting the stage for an exploration of the groundbreaking Notes and Domino 14. Discover the latest enhancements and revolutionary features that will redefine your experience. In this interactive session, unlock a treasure trove of tips and tricks to elevate your utilization of version 14, both with and without the game-changing panagenda MarvelClient. Brace yourself for also diving into Nomad, Nomad Web, and VoltMX, expanding your horizons in the expansive HCL landscape. Be a part of this exclusive opportunity to stay ahead in the ever-evolving world of HCL technologies. Your journey to mastering Notes and Domino 14 begins here. And remember, in the spirit of intergalactic exploration, don't forget to bring your towel!

W01_panagenda_Navigating-the-Future-with-The-Hitchhikers-Guide-to-Notes-and-D...

panagenda

%in tembisa+277-882-255-28 abortion pills for sale in tembisa

masabamasaba

Model Call Girl Services in Delhi reach out to us at 🔝 9953056974 🔝✔️✔️ Our agency presents a selection of young, charming call girls available for bookings at Oyo Hotels. Experience high-class escort services at pocket-friendly rates, with our female escorts exuding both beauty and a delightful personality, ready to meet your desires. Whether it's Housewives, College girls, Russian girls, Muslim girls, or any other preference, we offer a diverse range of options to cater to your tastes. We provide both in-call and out-call services for your convenience. Our in-call location in Delhi ensures cleanliness, hygiene, and 100% safety, while our out-call services offer doorstep delivery for added ease. We value your time and money, hence we kindly request pic collectors, time-passers, and bargain hunters to refrain from contacting us. Our services feature various packages at competitive rates: One shot: ₹2000/in-call, ₹5000/out-call Two shots with one girl: ₹3500/in-call, ₹6000/out-call Body to body massage with sex: ₹3000/in-call Full night for one person: ₹7000/in-call, ₹10000/out-call Full night for more than 1 person: Contact us at 🔝 9953056974 🔝. for details Operating 24/7, we serve various locations in Delhi, including Green Park, Lajpat Nagar, Saket, and Hauz Khas near metro stations. For premium call girl services in Delhi 🔝 9953056974 🔝. Thank you for considering us!

CHEAP Call Girls in Pushp Vihar (-DELHI )🔝 9953056974🔝(=)/CALL GIRLS SERVICE

9953056974 Low Rate Call Girls In Saket, Delhi NCR

At TECUNIQUE, we're a stable and steadily growing Indian software services company with over 14 years of industry experience. Specializing in offshore software development and quality assurance services, we've built a reputation for delivering unique and effective solutions to start-ups, software development companies, enterprises, and digital agencies. We pride ourselves on our commitment to excellence and innovation. By blending insightful business domain knowledge with exceptional technical prowess, we craft tailor-made solutions that meet the unique needs of our clients. Our dedicated teams are adept in specific technologies, ensuring seamless integration of skills and delivering reliable, scalable, and high-quality software solutions aligned with our clients' preferences. Bespoke Dedicated Teams: Crafted to meet your specific needs and technology preferences, our dedicated teams are committed to delivering top-notch software solutions. Offshore Software Development: Accelerate your software development and scale up quickly with our 12+ years of expertise in offshore development. Quality Assurance Services: Ensure the quality of your software products with our dedicated teams of experienced QA professionals. IT Staff Augmentation: Overcome skill gaps with our client-centric software team, offering staff augmentation services. Expert Software Services: Unlock our capabilities in custom software development, product development, and quality assurance. Mission and Vision: Our mission at TECUNIQUE is to be the catalyst for our clients' success in the dynamic domain of software development. Rooted in our core values of respect, authenticity, and responsibility, we strive to ease the software outsourcing experience, reducing both time and cost to market for our clients. We envision ourselves as the leading Indian software services company, renowned for our unwavering commitment to excellence and innovation. www.tecunique.com

TECUNIQUE: Success Stories: IT Service provider

mohitmore19

In the realm of real-time applications, Large Language Models (LLMs) have long dominated language-centric tasks, while tools like OpenCV have excelled in the visual domain. However, the future (maybe) lies in the fusion of LLMs and deep learning, giving birth to the revolutionary concept of Large Action Models (LAMs). Imagine a world where AI not only comprehends language but mimics human actions on technology interfaces. For example, the Rabbit r1 device presented at CES 2024, driven by an AI operating system and LAM, brings this vision to life. It executes complex commands, leveraging GUIs with unprecedented ease. In this presentation, join me on a journey as a software engineer tinkering with WebRTC, Janus, and LLM/LAMs. Together, we’ll evaluate the current state of these AI technologies, unraveling the potential they hold for shaping the future of real-time applications.

Unveiling the Tech Salsa of LAMs with Janus in Real-Time Applications

Alberto González Trastoy

ManageIQ - Sprint 236 Review - Slide Deck

ManageIQ

(Vivek)Call Us, 8448380779,Call girls in Delhi NCr – We Offer best in class call girls. escort Service At Affordable Price At low Rate with Space Night 8000 We Are One Of The Oldest Escort and Call girls Agencies in Delhi. You Will Find That Our Female Escorts Are Full Of Fun, Sexy And They Would Love Enjoy Your Company. We Have A Fantastic Selection Of Escort Ladies Available For In-Calls As Well As Out-Calls. Our Escorts Are Not Only Beautiful But All Have Great Personalities Making Them The Perfect Companion For Any Occasion. In-Call:- You Can Come At Our Place in Delhi Our place Which Is Very Clean Hygienic 100% safe Accommodation. Out-Call:- You have To Come Pick The Girl From My Place We Are Also Provide Door Step Services (Delhi Ncr, Noida, Gurgaon, Faridabad, Ghaziabad Note:- Pic Collectors Time Passers Bargainers Stay Away As We Respect The Value For Your Money Time And Expect The Same From You Hygienic:- Full Ac room And Clean Rooms Available In Hotel 24 * 7 Hourly In Delhi NCR More Details, With WhatsApp Number, +91-8448380779

call girls in Vaishali (Ghaziabad) 🔝 >༒8448380779 🔝 genuine Escort Service 🔝✔️✔️

Delhi Call girls

%in Midrand+277-882-255-28 abortion pills for sale in midrand

masabamasaba

Learn the Fundamentals of XCUITest Framework_ A Beginner's Guide.pdf

kalichargn70th171

Define the academic and professional writing..pdf

PearlKirahMaeRagusta1

Kürzlich hochgeladen (20)

introduction-to-automotive Andoid os-csimmonds-ndctechtown-2021.pdf

VTU technical seminar 8Th Sem on Scikit-learn

MarTech Trend 2024 Book : Marketing Technology Trends (2024 Edition) How Data...

10 Trends Likely to Shape Enterprise Technology in 2024

Introducing Microsoft’s new Enterprise Work Management (EWM) Solution

Exploring the Best Video Editing App.pdf

AI & Machine Learning Presentation Template

The Guide to Integrating Generative AI into Unified Continuous Testing Platfo...

The Top App Development Trends Shaping the Industry in 2024-25 .pdf

%in kaalfontein+277-882-255-28 abortion pills for sale in kaalfontein

W01_panagenda_Navigating-the-Future-with-The-Hitchhikers-Guide-to-Notes-and-D...

%in tembisa+277-882-255-28 abortion pills for sale in tembisa

CHEAP Call Girls in Pushp Vihar (-DELHI )🔝 9953056974🔝(=)/CALL GIRLS SERVICE

TECUNIQUE: Success Stories: IT Service provider

Unveiling the Tech Salsa of LAMs with Janus in Real-Time Applications

ManageIQ - Sprint 236 Review - Slide Deck

call girls in Vaishali (Ghaziabad) 🔝 >༒8448380779 🔝 genuine Escort Service 🔝✔️✔️

%in Midrand+277-882-255-28 abortion pills for sale in midrand

Learn the Fundamentals of XCUITest Framework_ A Beginner's Guide.pdf

Define the academic and professional writing..pdf

Clean Code with Java 8 - Functional Patterns and Best Practices

1. #DevoxxFR @victorrentea Clean Code with Java 8 Functional Patterns and Best Practices - live coding marathon - Victor Rentea VictorRentea@gmail.com www.VictorRentea.ro 1

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

4. #DevoxxFR @victorrentea  Spring  Hibernate  Clean Code, Architectures  Java 8, Design Patterns  Unit Testing  Java Performance  Scala & more... Independent Technical Trainer VictorRentea@gmail.com VictorRentea.ro 1000+ developers 1500+ hours since 2013 tough clients:

5. #DevoxxFR @victorrentea Not Convinced? 5

6. They were! Not Convinced?

7. #DevoxxFR @victorrentea Hard-Core Mode

8. #DevoxxFR @victorrentea Hard-Core Mode

9. #DevoxxFR @victorrentea Let's CODE !! 9 I'll push everything here: https://github.com/victorrentea/clean-code-java8-devoxxfr

10. #DevoxxFR @victorrentea

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

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

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

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

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

19. #DevoxxFR @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. #DevoxxFR @victorrentea Merci 20 @victorrentea VictorRentea@gmail.com www.VictorRentea.ro Disclaimer: The use of ® or ™ is the slides is only anecdotic. Let's Chat:

Clean Code with Java 8 - Functional Patterns and Best Practices

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Ähnlich wie Clean Code with Java 8 - Functional Patterns and Best Practices

Ähnlich wie Clean Code with Java 8 - Functional Patterns and Best Practices (20)

Mehr von Victor Rentea

Mehr von Victor Rentea (14)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

Clean Code with Java 8 - Functional Patterns and Best Practices