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.
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Slides for my deep dive session at Devoxx Belgium 2019.
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OOP, Functional Programming, Functions, Feature Envy, Design, Refactoring, Extract Method, Signatures, side effects, pure functions, programming paradigms, emotions
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Would you attach your last commit to your CV:
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For a company/individual training, check out my website: victorrentea.ro
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* Encapsulate conditionals (great with Java8)
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* Introduce Method Object for heavy logic
* Early return errors
* Extract static util functions
* Spawn smart Value Object vs logic in Utils
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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.
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- Ways to persist your impact after the session
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Presentation by Victor Polischuk for XPDays Ukraine. Describes refactoring specific of "legacy" projects and ways how to make it easy for developers.
Tdd is not about testing
Why should we use TDD to develop in Elixir? When we are applying it correctly? What are the differences that we can find in a code developed with TDD and in code not developed with it? Is it TDD about testing? Really? In this talk, I'll show what is TDD and how can be used it in functional programming like Elixir to design the small and the big parts of your system, showing what are the difference and the similarities between an OOP and FP environment. Showing what is the values of applying a technique like TDD in Elixir and what we should obtain applying it.
What's hot (20)
Functional Programming Patterns with Java 8 (at Devoxx BE)
Functional Programming Patterns with Java 8 (at Devoxx BE)
The Proxy Fairy, and The Magic of Spring Framework
The Proxy Fairy, and The Magic of Spring Framework
Functional Patterns with Java8 @Bucharest Java User Group
Functional Patterns with Java8 @Bucharest Java User Group
The Proxy Fairy and the Magic of Spring @JAX Mainz 2021
The Proxy Fairy and the Magic of Spring @JAX Mainz 2021
A Tale About the Evil Partial Mock and Separation by Layers of Abstractions
A Tale About the Evil Partial Mock and Separation by Layers of Abstractions
Evolving a Clean, Pragmatic Architecture - A Craftsman's Guide
Evolving a Clean, Pragmatic Architecture - A Craftsman's Guide
Engaging Isolation - What I've Learned Delivering 250 Webinar Hours during CO...
Engaging Isolation - What I've Learned Delivering 250 Webinar Hours during CO...
Similar to Functional Patterns with Java8 at Devoxx UK - Slides
Building frameworks: from concept to completion
What are considerations when building a framework/library? How does that apply to OutSystems components? In this session, we’ll do a deep dive into the importance of addressing certain concepts like code granularity, and architecture, in order to create useful, future-proof and coherent frameworks that deliver the best possible developer experience.
Workshop Intro: FrontEnd General Overview
Workshop Overview General del ecosistema de Javascript y de los Frameworks actuales.
¿Hacia dónde vamos?
ReactJS - Flux Pattern - ReactNative.
RactiveJS, VueJS.
Presentado por Ing. Marc Torrent
Rethinking Best Practices
React is a different way to write JavaScript apps. When it was introduced at JSConf US in May, the audience was shocked by some of its design principles. One sarcastic tweet from an audience member ended up describing React’s philosophy quite accurately: https://twitter.com/cowboy/status/339858717451362304
We’re trying to push the limits of what’s possible on the web with React. My talk will start with a brief introduction to the framework, and then dive into three controversial topics: Throwing out the notion of templates and building views with JavaScript, “re-rendering” your entire application when your data changes, and a lightweight implementation of the DOM and events.
JavaOne 2017 - Choosing a NoSQL API and Database to Avoid Tombstones and Drag...
JavaOne 2017 - Choosing a NoSQL API and Database to Avoid Tombstones and Drag...Leonardo De Moura Rocha Lima
Game On! (@gameontext – http://game-on.org) is an awesome throwback text-based adventure built with microservices. Completely open source, it enables everyone to choose their own adventure to learn about microservices concepts while extending the game. One of the core services is the Map, which maintains a two-dimensional map containing all the registered rooms. The Map started with a document store as a back end, but as the Map changed over time, tombstones started to accrue. And then people started to ask how to manage three dimensions, and dragons appeared. Come to this session to find out why the decision was made to change the NoSQL back end, how it was done, and the result of the change with a new NoSQL API (http://jnosql.org/).Integrating react in django while staying sane and happy
This is our developer Mikales presentation for his talk during our Django meetup on June 14, 2018. Enjoy!
The theme was "Django and JS frontend frameworks, making it work" and you can read more about the Django Stockholm Meetup Group at meetup.com/djangosthlm.
Devoxx France 2018 GraphQL vs Traditional REST API
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 ;)
Eclipse JNoSQL Good Practices at OXM
Eclipse JNoSQL is a framework whose has the goal to help Java developers to create Java EE applications with NoSQL
Eclipse JNoSQL is a Java framework that streamlines the integration of a Java application with the NoSQL database. It defines a set of APIs to interact with the NoSQL database and provides a standard implementation for most NoSQL databases.
This clearly helps to achieve very low coupling with the underlying NoSQL technologies used in applications.
If you want to contribute to the project, this is the Github repository:
https://github.com/JNOSQL
From Web to Flux @DevoxxBE 2023.pptx
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.
Java vs .Net
In this ppt you will get the differences b/w .net and java .
and also know the various feature of both Commanding language and Platform .
Unit testing hippo
During this presentation we are going to look at multiple solutions that are available for mocking JCR and go through their pros and cons. Then we are going to have look at Hippo Unit Test to see how Hippo Unit tester leverages JCR mocking to enable us to write easy to read and maintain unit tests.
The State of Wicket
The current state of the Apache Wicket framework in 2014 as presented at the DEVdev meetup held in Deventer, the Netherlands.
- A critique of ThoughtWorks' Technology Review 2014 where they slam JSF (jay) as a concept (nay)
- A look back at 10 years of Wicket
- A review of the current Wicket versions
- An outlook and roadmap for Wicket 7 and Wicket 8
The DEVdev (Deventer Developers) is a new meetup for any developer in the eastern part of the Netherlands (the right side of the IJssel river). This presentation was delivered at the first meetup, and was kindly sponsored by Topicus B.V.
All the reasons for choosing react js that you didn't know about - Avi Marcus...
As presented in CodeMotion Tel Aviv:
http://telaviv.codemotionworld.com
Testing Microservices @DevoxxBE 23.pdf
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.
02 java programming features of java i
This is the second presentation in java programming series.
It covers java features such as
Java is Simple,
Java is 100% Object-oriented
Java is Two-Stage / Interpreted language
Java is Platform independent,
Java is Architecture Neutral,
Java is Portable,
Difference between Platform independent, Architecture Neutral and Portable feature
A very important presentation for java certification Examination.
to watch the full video on this presentation kindly click on
https://youtu.be/X0lYq3z0eXc
www.youtube.com/riseshinekg2pg
#ravipatki #riseandshineeducations
JDD2015: Java Everywhere Again—with DukeScript - Jaroslav Tulach
JAVA EVERYWHERE AGAIN—WITH DUKESCRIPT
For a long time, Java was perfect for creating cross-platform applications, but the advent of iPhone, iPad, and Android devices changed everything, resulting in a totally fragmented world. Catering to all these platform is troublesome and expensive. That’s why DukeScript was created: to make it easy to create cross-platform Java applications again. The goal of this hands-on lab is to create a cross-platform application from scratch that will run on iOS, Android, desktop, browser, and embedded devices such as the Raspberry Pi. You’ll learn about the Model-View-ViewModel (MVVM) architecture, which enables you to write and test business code totally independently of the view, and, finally, you’ll see it combined with a view to complete a working application.
IMPORTANT
Before conference, please follow the steps to prepare for the session:
- perform the Maven repository initialization by creating the archetype and building it as
described at DukeScript website
- also download NetBeans IDE (either latest beta or at least 8.0.2)
- Installing Android SDK rev. 19 or bringing own Mac Book with XCode installed can be also found beneficial
SFScon 21 - Davide Montesin - Typescript vs. Java
Javascript is the language used the most for developing a web app or a hybrid mobile app, mainly because it can be executed directly by browsers. Java instead, can’t be run directly in a browser. On the other hand we have the language TypeScript, which is an open-source language that adds compile time type checking to Javascript, similar to Java, with the goal to prevent bugs mainly in the large code base. It is not uncommon for developers to write code using more than one programming language over time.
In this talk you will find out, how I survived adding Typescript/Javascript to the programming languages I work with, after a long experience of development with Java. Let’s go!
[KubeCon NA 2018] Telepresence Deep Dive Session - Rafael Schloming & Luke Sh...
One of the challenges facing Telepresence is growing the contributor community. It’s a complex application that requires a good understanding of OS networking, VPNs, Kubernetes, and everything in between. We’ll kick off this meeting with a general architectural overview of Telepresence. We’ll talk about how we’ve managed the project to date, and our investments to make it easier. We want to then turn it over for an interactive discussion with participants to see what we can do to make it easier to contribute and grow the Telepresence community.
Code Generation with giant CRUD
The presentation I gave at JavaPolis 2007 about code generation for big domain models.
Similar to Functional Patterns with Java8 at Devoxx UK - Slides (20)
JavaOne 2017 - Choosing a NoSQL API and Database to Avoid Tombstones and Drag...
JavaOne 2017 - Choosing a NoSQL API and Database to Avoid Tombstones and Drag...
Integrating react in django while staying sane and happy
Integrating react in django while staying sane and happy
Devoxx France 2018 GraphQL vs Traditional REST API
Devoxx France 2018 GraphQL vs Traditional REST API
JUG Münster 2014 - Code Recommenders & Codetrails - Wissenstransfer 2.0
JUG Münster 2014 - Code Recommenders & Codetrails - Wissenstransfer 2.0
All the reasons for choosing react js that you didn't know about - Avi Marcus...
All the reasons for choosing react js that you didn't know about - Avi Marcus...
JDD2015: Java Everywhere Again—with DukeScript - Jaroslav Tulach
JDD2015: Java Everywhere Again—with DukeScript - Jaroslav Tulach
[KubeCon NA 2018] Telepresence Deep Dive Session - Rafael Schloming & Luke Sh...
[KubeCon NA 2018] Telepresence Deep Dive Session - Rafael Schloming & Luke Sh...
More from Victor Rentea
Finding Java's Hidden Performance Traps @ DevoxxUK 2024
Tracing the root cause of a performance issue requires a lot of patience, experience, and focus. It’s so hard that we sometimes attempt to guess by trying out tentative fixes, but that usually results in frustration, messy code, and a considerable waste of time and money. This talk explains how to correctly zoom in on a performance bottleneck using three levels of profiling: distributed tracing, metrics, and method profiling. After we learn to read the JVM profiler output as a flame graph, we explore a series of bottlenecks typical for backend systems, like connection/thread pool starvation, invisible aspects, blocking code, hot CPU methods, lock contention, and Virtual Thread pinning, and we learn to trace them even if they occur in library code you are not familiar with. Attend this talk and prepare for the performance issues that will eventually hit any successful system.
About authorWith two decades of experience, Victor is a Java Champion working as a trainer for top companies in Europe. Five thousands developers in 120 companies attended his workshops, so he gets to debate every week the challenges that various projects struggle with. In return, Victor summarizes key points from these workshops in conference talks and online meetups for the European Software Crafters, the world’s largest developer community around architecture, refactoring, and testing. Discover how Victor can help you on victorrentea.ro : company training catalog, consultancy and YouTube playlists.
Modular Monolith - a Practical Alternative to Microservices @ Devoxx UK 2024
The microservices honeymoon is over. When starting a new project or revamping a legacy monolith, teams started looking for alternatives to microservices. The Modular Monolith, or 'Modulith', is an architecture that reaps the benefits of (vertical) functional decoupling without the high costs associated with separate deployments. This talk will delve into the advantages and challenges of this progressive architecture, beginning with exploring the concept of a 'module', its internal structure, public API, and inter-module communication patterns. Supported by spring-modulith, the talk provides practical guidance on addressing the main challenges of a Modultith Architecture: finding and guarding module boundaries, data decoupling, and integration module-testing. You should not miss this talk if you are a software architect or tech lead seeking practical, scalable solutions.
About the author
With two decades of experience, Victor is a Java Champion working as a trainer for top companies in Europe. Five thousands developers in 120 companies attended his workshops, so he gets to debate every week the challenges that various projects struggle with. In return, Victor summarizes key points from these workshops in conference talks and online meetups for the European Software Crafters, the world’s largest developer community around architecture, refactoring, and testing. Discover how Victor can help you on victorrentea.ro : company training catalog, consultancy and YouTube playlists.
Microservice Resilience Patterns @VoxxedCern'24
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!
Distributed Consistency.pdf
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
Clean Code @Voxxed Days Cluj 2023 - opening Keynote
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.
Test-Driven Design Insights@DevoxxBE 2023.pptx
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.
Profiling your Java Application
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.
OAuth in the Wild
Slides for my presentation about OAuth, going in depth in the details of the Authorization Code Grant and PKCE, also describing several security threats to OAuth
The tests are trying to tell you something@VoxxedBucharest.pptx
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.
Vertical Slicing Architectures
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
Software Craftsmanship @Code Camp Festival 2022.pdf
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.
Unit testing - 9 design hints
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.
Integration testing with spring @JAX Mainz
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.
Pure functions and immutable objects @dev nexus 2021
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.
Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...
A Pragmatic approach to work with exceptions in Java. Talk recording: https://www.youtube.com/watch?v=LRwCE7GreSM&feature=youtu.be
Discussing checked exceptions, Vavr, Lombok, and JooL library, Spring Framework and many more.
Supporting in-depth article series: https://victorrentea.ro/blog/exception-handling-guide-in-java/
Don't Be Mocked by your Mocks - Best Practices using Mocks
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
Pure Functions and Immutable Objects
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
Definitive Guide to Working With Exceptions in Java
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.
More from Victor Rentea (19)
Finding Java's Hidden Performance Traps @ DevoxxUK 2024
Finding Java's Hidden Performance Traps @ DevoxxUK 2024
Modular Monolith - a Practical Alternative to Microservices @ Devoxx UK 2024
Modular Monolith - a Practical Alternative to Microservices @ Devoxx UK 2024
Clean Code @Voxxed Days Cluj 2023 - opening Keynote
Clean Code @Voxxed Days Cluj 2023 - opening Keynote
The tests are trying to tell you something@VoxxedBucharest.pptx
The tests are trying to tell you something@VoxxedBucharest.pptx
Software Craftsmanship @Code Camp Festival 2022.pdf
Software Craftsmanship @Code Camp Festival 2022.pdf
Pure functions and immutable objects @dev nexus 2021
Pure functions and immutable objects @dev nexus 2021
Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...
Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...
Don't Be Mocked by your Mocks - Best Practices using Mocks
Don't Be Mocked by your Mocks - Best Practices using Mocks
Definitive Guide to Working With Exceptions in Java
Definitive Guide to Working With Exceptions in Java
Recently uploaded
Automated software refactoring with OpenRewrite and Generative AI.pptx.pdf
https://2024.springio.net/sessions/automated-software-refactoring-with-openrewrite-and-generative-ai/
A Study of Variable-Role-based Feature Enrichment in Neural Models of Code
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
How to Position Your Globus Data Portal for Success Ten Good Practices
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
Providing Globus Services to Users of JASMIN for Environmental Data Analysis
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Enhancing Research Orchestration Capabilities at ORNL.pdf
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoam
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
A Sighting of filterA in Typelevel Rite of Passage
Slide deck home: https://fpilluminated.com/deck/220
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
Prosigns: Transforming Business with Tailored Technology Solutions
Unlocking Business Potential: Tailored Technology Solutions by Prosigns
Discover how Prosigns, a leading technology solutions provider, partners with businesses to drive innovation and success. Our presentation showcases our comprehensive range of services, including custom software development, web and mobile app development, AI & ML solutions, blockchain integration, DevOps services, and Microsoft Dynamics 365 support.
Custom Software Development: Prosigns specializes in creating bespoke software solutions that cater to your unique business needs. Our team of experts works closely with you to understand your requirements and deliver tailor-made software that enhances efficiency and drives growth.
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Functional Patterns with Java8 at Devoxx UK - Slides
- 1. @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
- 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 Krakow Vienna Sofia Casablanca Bucharest Iasi Belgrade Kiew Barcelona
- 4. #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:
- 9. #DevoxxUK @victorrentea Let's CODE !! 10 I'll push everything here: https://github.com/victorrentea/functional-patterns-devoxx-uk
- 11. #DevoxxUK @victorrentea The Clean Code Rules Applied to Java 8 12
- 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
- 13. #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
- 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
- 15. #DevoxxUK @victorrentea Passing-a-Block Pass logic to your function The Funeral of Template Method™ 16
- 16. #DevoxxUK @victorrentea Loan Pattern You work with a resource that is managed for you Decouples real logic from infra code 17
- 17. #DevoxxUK @victorrentea Execute Around Pattern Explicit AOP ~ Proxy™ or Decorator™ 18
- 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
- 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
- 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??
- 21. #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:
- 22. #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?