Functional Programming Patterns with Java 8 (at Devoxx BE)
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The document is a presentation by Victor Rentea on functional programming patterns using Java 8, showcasing his expertise as a technical trainer and architect. It discusses various programming principles and patterns such as avoiding nulls, using optional values, and implementing clean code practices. Additionally, it promotes a DZone article for further reading on the topic.
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The Joy of Testing - Deep Dive @ Devoxx Belgium 2024Victor Rentea The document provides an extensive overview of best practices in unit testing, covering topics such as test qualities, coverage management, mutation testing, and BDD methodologies. It emphasizes the importance of meaningful test names, the use of tools like AssertJ, and strategies for testing legacy code, alongside real-world examples from the speaker's extensive experience. The coding resources mentioned are available on GitHub, highlighting a hands-on approach to learning testing techniques.
Finding Java's Hidden Performance Traps @ DevoxxUK 2024
Finding Java's Hidden Performance Traps @ DevoxxUK 2024Victor Rentea The document discusses performance profiling in Java applications, focusing on distributed request tracing and execution profiling. It outlines methodologies, including the use of trace IDs for tracking requests, and tools like Micrometer and Java Flight Recorder for monitoring performance metrics. Key challenges and common performance pitfalls are highlighted, along with examples of how to resolve them effectively.
Modular Monolith - a Practical Alternative to Microservices @ Devoxx UK 2024
Modular Monolith - a Practical Alternative to Microservices @ Devoxx UK 2024Victor Rentea Victor Rentea discusses the benefits and challenges of using a modulith architecture as an alternative to microservices, highlighting its ability to balance complexity and productivity. He emphasizes starting with a simple monolith and gradually decoupling it into modules as needed, rather than jumping directly into microservices. The document also touches on the importance of proper code and data isolation, as well as the need for effective testing and monitoring in modular systems.
Microservice Resilience Patterns @VoxxedCern'24
Microservice Resilience Patterns @VoxxedCern'24Victor Rentea The document discusses resilience patterns for microservices, emphasizing the importance of handling unexpected situations with minimal user impact and graceful degradation. It outlines various strategies including isolation, bulkheads, circuit breakers, and idempotency that help maintain system availability and performance under failure conditions. The author, Victor Rentea, also highlights the significance of monitoring, asynchronous communication, and eventual consistency in building resilient systems.
Distributed Consistency.pdf
Distributed Consistency.pdfVictor Rentea The document discusses various strategies for maintaining consistency in distributed systems, focusing on techniques such as 2-phase commit (2PC), transactional outbox patterns, and saga patterns for managing transactions across multiple services. It highlights the challenges associated with these approaches, including potential failures and the need for idempotency in operations. Additionally, it provides practical scenarios and examples related to message queuing, event handling, and state management in the context of microservices architecture.
Testing Microservices @DevoxxBE 23.pdf
Testing Microservices @DevoxxBE 23.pdfVictor Rentea Victor Rentea offers training on testing microservices, sharing insights on unit testing, integration testing, and the challenges of flaky and slow tests. He emphasizes the importance of decoupling tests and using real environments to enhance test reliability, suggesting various strategies to improve testing efficiency and reduce cognitive load. The document highlights key techniques such as contract testing and using Docker for a production-like setup.
From Web to Flux @DevoxxBE 2023.pptx
From Web to Flux @DevoxxBE 2023.pptxVictor Rentea Victor Rentea, a Java champion with extensive experience in clean coding and reactive programming, offers insights into reactive programming as a way to handle asynchronous data streams. He emphasizes the use of Project Reactor for backend Java applications and provides practical advice on transitioning from imperative to reactive programming. The document outlines best practices, operator handling, and the benefits of virtual threads in managing high concurrency without the typical risks associated with reactive programming.
Test-Driven Design Insights@DevoxxBE 2023.pptx
Test-Driven Design Insights@DevoxxBE 2023.pptxVictor Rentea The document provides insights into test-driven design and best practices for unit testing, emphasizing the importance of emergent design, minimalism, and the effective use of mocks. It critiques common pitfalls such as overengineering and the misuse of mocks, advocating for clear responsibilities in code and functional programming principles. Additionally, the author discusses the evolution of testing strategies and the need for clarity in unit tests to promote better design and maintainable code.
Profiling your Java Application
Profiling your Java ApplicationVictor Rentea This document discusses Java application profiling, covering tools and techniques for identifying performance issues such as slow endpoint response times and connection starvation. It highlights the use of Micrometer for monitoring system metrics, Java Flight Recorder for profiling, and provides practical examples of how to implement these tools in applications. The content also addresses challenges in distributed systems and emphasizes the importance of proper profiling and monitoring for optimizing performance.
OAuth in the Wild
OAuth in the WildVictor Rentea OAuth (Open Authorization) is an open standard for access delegation that allows users to grant applications access to their data on other platforms without sharing passwords. The framework enables third-party apps to request limited access to a user's information, implementing key steps such as obtaining an authorization code and using it to acquire an access token. Various security attacks and vulnerabilities, such as open redirects and token leakage, are discussed, highlighting the importance of proper implementation to safeguard user data.
The tests are trying to tell you [email protected]
The tests are trying to tell you [email protected]Victor Rentea The document discusses principles of effective unit testing and design feedback, emphasizing the importance of design hints derived from testing practices. It highlights the pitfalls of over-mocking, advocates for simpler data structures, and promotes the use of precise signatures to reduce complexity. The content also suggests that unit testing enhances design quality by enforcing a clearer architecture and facilitating easier refactoring.
Unit testing - 9 design hints
Unit testing - 9 design hintsVictor Rentea Victor Rentea discusses design improvements revealed through unit testing, emphasizing the importance of writing responsible tests to enhance design skills. Key concepts include the CQS principle, using mocks wisely, and maintaining separation of complexity in design. The talk also highlights the role of pure functions and immutable objects in creating better testable code.
Clean pragmatic architecture @ devflix
Clean pragmatic architecture @ devflixVictor Rentea Victor Rentea introduces himself as a Java Champion, trainer, and speaker who focuses on topics like Hibernate, Spring, Java 8/FP, architecture, clean code, unit testing, reactive programming, and Java performance. He advocates building a deep, rich domain model with value objects and entities that encapsulate logic and enforce invariants. The document provides guidance on applying principles like separating concerns with layers, dependency inversion, and avoiding anemic domain models in order to build flexible, testable systems that are decoupled from frameworks and external dependencies.
Integration testing with spring @JAX Mainz
Integration testing with spring @JAX MainzVictor Rentea The document provides an extensive guide on integration testing using Spring, detailing various best practices, tools, and techniques. It emphasizes the importance of managing test failures, optimizing test speeds, and using mock objects effectively within a Spring context. Additionally, it covers database interactions and suggests methods for organizing tests and data fixtures to streamline development processes.
Integration testing with spring @snow one
Integration testing with spring @snow oneVictor Rentea This document provides an overview of integration testing strategies and techniques. It discusses the differences between unit tests and integration tests, including that integration tests involve multiple layers and dependencies like databases, files, and web services, making them slower and more fragile. It also covers best practices for integration tests such as using an in-memory database, WireMock for stubbing external services, transaction management, and strategies for cleaning up after tests.
Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...
Definitive Guide to Working With Exceptions in Java - takj at Java Champions ...Victor Rentea The document outlines concepts and best practices for handling exceptions in Java, emphasizing the differences between checked and unchecked exceptions and the importance of proper error logging and user-friendly messaging. It introduces patterns like catch-rethrow and suggests using runtime exceptions to simplify error handling. Additionally, it provides resources for further reading on exception management and Java programming techniques.
Don't Be Mocked by your Mocks - Best Practices using Mocks
Don't Be Mocked by your Mocks - Best Practices using MocksVictor Rentea The document is a training resource by Victor Rentea, focused on unit testing, design patterns, and mocking techniques for software development. It emphasizes the importance of creating pure functions, managing dependencies, and the appropriate use of mocks and stubs in testing. Additionally, it provides insights on testing strategies, handling complex code, and ensuring robustness in test design.
Definitive Guide to Working With Exceptions in Java
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Functional Programming Patterns with Java 8 (at Devoxx BE)
- 1. VictorRentea.ro1 Functional Programming Patterns With Java 8 - a live coding marathon - @VictorRentea www.VictorRentea.ro Victor Rentea Independent Trainer, Lead Architect at IBM
- 2. Victor Rentea 14 years of Java Clean Code Evangelist VictorRentea.ro Moscow Paris London Krakow Vienna Sofia Casablanca Belgrade Kiew Barcelona .NET + more Lead Architect Tech Team Lead and Consultant Software Craftsman XP: Pair Programming, Refactoring, TDD Bucharest Software Craftsmanship Community founder of
- 3. VictorRentea.ro @victorrentea [email protected] Independent Technical Trainer & Coach HibernateSpring Java 8 Architecture, DDDDesign Patterns Clean Code Unit Testing, TDD Java Performance and more…Scala 15 more… 100+ days1000 devs5 years [email protected] at: follow me
- 6. VictorRentea.ro6 lower play rate in YouTube
- 8. VictorRentea.ro8 Expressive Names -> { Lambdas should be one liners Extract heavy lambdas into named ::methods in the same class in the item class as static methods
- 9. VictorRentea.ro9 No Nullable Parameters Avoid Returning Null, Throw Ex Optional Instead: thatOpt.map(doStuffWithIt) …, or return an Optional Even from Entity gettersMonad
- 10. VictorRentea.ro10 Execute arbitrary logic within a function CPP +1 boolean param Extract & @Override Template Method® Passing-a-Block exporter.exportFile("orders.csv", orderWriter::writeContent);
- 11. VictorRentea.ro11 The Loan Pattern Passing-a-Block try (Writer writer = new FileWriter(file)) { contentWriter.accept(writer); return file; } catch (...) { ... } exporter.exportFile("orders.csv", orderWriter::writeContent); contentWriter is "loaned" a Writer managed here similarly: Testable Infrastructure decoupled from export format test with a dummy format test with a StringWriter
- 12. VictorRentea.ro12 Execute Around Pattern Passing-a-Block Ad-hoc Proxy® or Decorator®
- 13. VictorRentea.ro13 Rethrow Checked as Runtime Prefer Runtime Exceptions Java8 functional interfaces don't throw anything libs: jool, vavr, lombok
- 14. VictorRentea.ro14 switch Switch Hunt Day Hope to find them all: JDD Simplest 1 switch = 1 method case XX: return … OOP Extends is BAD Combinatorial Children90Movie enum Logic Bits In enum methods Logic with Dependencies Function references on enums Type-specific Logic
- 17. 17 Too Disclaimer: The use of ® or ™ is the slides is only anecdotic. VictorRentea.ro Thank You! Let's chat! Read it all in my dzone article dzone.com/articles/functional-programming-patterns-with-java-8
- 18. 18 Too VictorRentea.ro I'm available a statement of seniority I use both hemispheres Tough meetings? Abused estimates? Purpose of code:--Uncle Bob 1. Maintainable 2. Does its job! Functional Party Activist Stay into The Light Trainings, talks, goodies @VictorRentea Quality posts daily on Clean Code needs strength and determination Thank You! come take 1 sticker Let's chat! or a poster Read it all in my dzone article dzone.com/articles/functional-programming-patterns-with-java-8 (for tech leads)
Editor's Notes
- #3: Salut! Eu sunt Victor si am 14 ani… de lucru cu Java, desi in ultimii ani am fost impins sa invat si PHP, Scala si C#. Lucrez la IBM ca Lead Archirect, in Bucuresti. Stiati voi ca aveti un IBM chiar aici in Cluj, intr-un sediu nou-nout. In…. De fapt, cu ajorul IBM sunt astazi aici cu voi. Stiu deja ce ganditi… aa.. E architect. Sta undeva langa un ficus si deseneaza pe pereti diagrame UML.. -NU . Eu bag la cod. Lucrez pe cele mai dificile proiecte pe care le avem. La sfarsh:Sala mare -