Functional Patterns with Java8 at Devoxx UK - Slides
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The document is a presentation by Victor Rentea on functional programming patterns in Java 8, highlighting best practices such as using descriptive names, avoiding checked exceptions, and leveraging optional types. It includes various design patterns like the loan pattern and execute around pattern, emphasizing clean code principles and effective use of Java's functional features. The presentation encourages attendees to apply these patterns for better code maintainability and readability.
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Finding Java's Hidden Performance Traps @ DevoxxUK 2024
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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.
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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.
Clean Code @Voxxed Days Cluj 2023 - opening Keynote
Clean Code @Voxxed Days Cluj 2023 - opening KeynoteVictor Rentea The document explores the principles of clean code and its importance in software development, stressing practices like avoiding duplicated code and adhering to clean coding techniques for maintainability. It highlights common code smells and complexities, providing insights into improving code clarity and reliability through various methodologies. Additionally, the author shares personal experiences and resources for learning and applying clean coding practices effectively.
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.
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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.
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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.
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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.
Vertical Slicing Architectures
Vertical Slicing ArchitecturesVictor Rentea The document outlines a comprehensive training session by Victor Rentea, focusing on software architecture techniques including concentric architectures, vertical slicing, and microservices. It covers principles such as dependency inversion, testing strategies, and the importance of clear module boundaries, emphasizing best practices in designing scalable and maintainable software systems. Additionally, it addresses common pitfalls like overengineering and nano-services, while providing resources and examples for further understanding.
Software Craftsmanship @Code Camp Festival 2022.pdf
Software Craftsmanship @Code Camp Festival 2022.pdfVictor Rentea The document discusses the evolution of software craftsmanship and its importance in developing a technical culture among developers. It emphasizes the need for collective code ownership, continuous learning, and adapting to changing technologies to enhance developers' adaptability and effectiveness. Key concepts include overcoming overspecialization, promoting agile practices, and fostering environments that encourage collaboration and knowledge sharing.
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.
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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.
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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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] www.VictorRentea.rocome and grab yours If you really-really liked it: http://victorrentea.ro#recommend In-house /remote training or coaching?