README.adoc

Asynchronous & reactive programming with Java

Table of Contents

• 🙋‍♂️ Presentation
  • 👩🏻‍🏫 Academic resources
• 📐 Examples
• 🔗 Resources
  • 👼🏻 Fundamentals
  • 👨‍👩‍👧‍👦 Main Reactive Streams implementations
  • 🍀 Spring ecosystem
  • 🌈 Other framework ecosystems
  • ☕ Project Loom
  • ⚒️ Libraries and tools
  • 📕 Books
  • 👣 Courses
• 🚶‍♀️ Who to follow?
  • 👩🏻‍💻 People
  • 👮🏻‍♂️ Official accounts
  • 🏡 Sites
• 🤝 Credits

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🙋‍♂️ Presentation

This repository is intended to be a compilation of presentations, examples, links, and other resources on asynchronous and reactive programming in Java.

This initiative is part of the final project of: Máster Cloud Apps. Desarrollo y despliegue de aplicaciones en la nube [ 🇪🇸 ]

The project also provides, as documentation, a presentation about asynchronous and reactive programming in Java. You can check the slides here:

Name	Version	Download	Updated at	Lang
Presentación: Programación asíncrona y reactiva con Java	1.0.0	pptx or pdf	2020-12-08	🇪🇸
Slides: Asynchronous and reactive programming with Java	0.0.3	pptx or pdf	2020-11-18	🇬🇧

👩🏻‍🏫 Academic resources

On the other hand, the academic resources delivered as part of the completion of the project are also included:

Name	Version	Download	Updated at	Lang
Memoria: Programación asíncrona y reactiva con Java	1.0.0	pdf	2020-12-14	🇪🇸
Presentación: Programación asíncrona y reactiva con Java	1.0.0	pdf	2020-12-14	🇪🇸

📐 Examples

This section lists a series of examples that are intended to guide the content of the presentation.

Each of the mentioned examples are based on the latest version of Java (15+) and Spring Boot (2.4+).

Maven (3.6+) or Gradle (6+) will be used as build/dependency management tool. In addition, some examples will use the Lombok library to generate code through annotations

• Example 00. Reactor operators: Simple project to practice with Project Reactor main operators. The purpose of the example is to show the behavior of Mono, Flux and their possibilities

• Example 01. Basic comparison: Basic CRUD API (GET, POST, PUT, DELETE) in two flavors, Spring MVC and Spring WebFlux

• Example 02. Using Spring WebClient: Basic API to retrieve information from remote web services using the reactive WebClient

• Example 03. Gateway!: Gateway service to route requests to worker services to practice with Spring Cloud Gateway project

• Example 04. Reactive DB access with R2DBC: Simple API with an internal relational PostgreSQL repository. R2DBC provides reactive non-blocking APIs to relational databases

• Example 05. Protocols. RSocket: A simple project to know thow the reactive binary protocol RSocket works. The example includes two small modules that communicate with each other, exploring the different possibilities that RSocket offers to us

• Example 06. Project Loom: Example for a first contact with Project Loom, its implementation and how to start with Virtual Threads

🔗 Resources

👼🏻 Fundamentals

• Reactive foundation

• The reactive manifesto

• The reactive principles

• 12 Factor App

• Reactive Streams Specification

• Java 11 Flow

• Project Reactor

👨‍👩‍👧‍👦 Main Reactive Streams implementations

• Project Reactor

• RxJava

• VertX

• Akka Streams

🍀 Spring ecosystem

It seems obvious but the best place to find good information about the Spring ecosystem is its official documentation:

• Spring Framework Docs

• Spring Boot Docs

• Project Reactor Docs

Table 1. Interesting videos and articles about Reactive Spring

Name	Author	Year	Info
Guide to "Reactive" for Spring MVC Developers	Rossen Stoyanchev	2018	🇬🇧 📹
Moving from Imperative to Reactive	Paul Harris	2019	🇬🇧 📹
Migrating from Imperative to Reactive	Nicholas Frankel	2020	🇬🇧 📋
Do’s and Don’ts: Avoiding First-Time Reactive Programmer Mines	Sergei Egorov	2019	🇬🇧 📹
Benefits of reactive programming with Reactor and Spring Boot 2	Violeta Georgieva	2019	🇬🇧 📹
Avoiding Reactor Meltdown	Phil Clay	2019	🇬🇧 📹
Reactive Performance	Oleh Dokuka	2019	🇬🇧 📹
Getting Started with R2DBC	Mark Heckler	2018	🇬🇧 📹
The RSocket Revolution	Josh Long	2020	🇬🇧 📹
Flight of the Flux: A look at Reactor execution model	Simon Baslé	2018	🇬🇧 📹
Flight of the Flux 1 - Assembly vs Subscription	Simon Baslé	2019	🇬🇧 📋
Flight of the Flux 2 - Debugging Caveats	Simon Baslé	2019	🇬🇧 📋
Flight of the Flux 3 - Hopping Threads and Schedulers	Simon Baslé	2019	🇬🇧 📋
Project Reactor: Which operator do I need? (Appendix A)	Project Reactor Docs	-	🇬🇧 📋

🌈 Other framework ecosystems

Table 2. Interesting videos and articles about other frameworks and ecosystems

Name	Author	Year	Ecosystem	Info
Quarkus - Getting started with Reactive	-	-	Quarkus	🇬🇧 📋
Reactive Quarkus–A Java Mutiny	Clement Escoffier	2020	Quarkus	🇬🇧 📹
Reactive HTTP Request Processing	-	-	Micronaut	🇬🇧 📋
Configurations for Reactive Programming	-	-	Micronaut	🇬🇧 📋
Microservicios reactivos con Micronaut	Iván López	2019	Micronaut	🇪🇸 📹
Micronaut Tutorial: Reactive	Piotr Minkowski	2019	Micronaut	🇬🇧 📋

☕ Project Loom

First and foremost: What is Project Loom?

According to OpenJDK Wiki:

Project Loom is to intended to explore, incubate and deliver Java VM features and APIs built on top of them for the purpose of supporting easy-to-use, high-throughput lightweight concurrency and new programming models on the Java platform. This is accomplished by the addition of the following constructs:

• Virtual threads

• Delimited continuations

• Tail-call elimination

Table 3. Interesting articles and resources about Project Loom

Name	Author	Year	Info
Loom - OpenJDK Wiki	-	-	🇬🇧
Project Loom: Modern Scalable Concurrency for the Java Platform	Ron Pressler	2020	🇬🇧 📹
On the performance of user-mode threads and coroutines	Ron Pressler	2020	🇬🇧 📋
On Project Loom	Nicholas Frankel	2020	🇬🇧 📋
Loom - Part 0 - Rationale	Arnaud Bos	2019	🇬🇧 📋
Loom - Part 1 - It’s all about Scheduling	Arnaud Bos	2019	🇬🇧 📋
Loom - Part 2 - Blocking code	Arnaud Bos	2019	🇬🇧 📋
Loom - Part 3 - Asynchronous code	Arnaud Bos	2019	🇬🇧 📋
Loom - Part 4 - Non-thread-blocking async I/O	Arnaud Bos	2020	🇬🇧 📋
Experimenting with Project Loom EAP and Spring WebMVC	Mark Paluch	2020	🇬🇧 📋
Project Loom and structured concurrency	Cay Horstmann	2020	🇬🇧 📋

⚒️ Libraries and tools

Table 4. Recommended libraries and tools

Name	Description
VisualVM	VisualVM is a visual tool integrating commandline JDK tools and lightweight profiling capabilities. Designed for both development and production time use
Java Mission Control	Mission Control is an open source production time profiling and diagnostics tool for Java
Awaitility	Awaitility is a DSL that allows you to express expectations of an asynchronous system in a concise and easy to read manner
BlockHound	Java agent to detect blocking calls from non-blocking threads
Reactor Tools	A set of tools to improve Project Reactor’s debugging and development experience. Starting from Reactor 3.3.0.M2, reactor-tools is now moved to reactor-core
Reactor Addons	Reactor-adapter and reactor-extras utils
Rx Marbles	A webapp for experimenting with diagrams of Rx Observables, for learning purposes

📕 Books

Table 5. Recommended books

Name	Author	Year	Lang
Reactive Design Patterns	Roland Kuhn, Jamie Allen	2014	🇬🇧
Reactive Application Development	Sean Walsh, Duncan K. DeVore, Brian Hanafee	2018	🇬🇧
Reactive Programming with RxJava: Creating Asynchronous	Tomasz Nurkiewicz, Ben Christensen	2016	🇬🇧
Hacking with Spring Boot 2.3: Reactive Edition	Greg L. Turnquist	2020	🇬🇧
Reactive Spring	Josh Long	2020	🇬🇧
Spring Boot: Up and Running: Building Cloud Native Java and Kotlin Applications	Mark Heckler	2021	🇬🇧

👣 Courses

Table 6. Recommended courses

Name	Author	Platform	Lang
Java concurrency and multithreading (playlist)	Jakob Jenkov	Youtube	🇬🇧
Efficient Java Multithreading and Concurrency with Executors	Arun Kumar	Udemy	🇬🇧
Reactive Spring	Josh Long	Oreilly	🇬🇧

🚶‍♀️ Who to follow?

👩🏻‍💻 People

• Simon Baslé, @simonbasle

• Jonas Bonér, @jboner

• Arnaud Bos, @arnaud_bos

• Oleh Dokuka, @OlehDokuka

• Sergei Egorov, @bsideup

• Clement Escoffier, @clementplop

• Nicholas Frankel, @nicolas_frankel

• Violeta Georgieva, @violeta_g_g

• Mark Heckler, @mkheck

• David Karnok, @akarnokd

• Josh Long, @starbuxman

• Audrey Neveu, @Audrey_Neveu

• Mark Paluch, @mp911de

• Ron Pressler, @pressron

• Rossen Stoyanchev, @rstoya05

• Dave Syer, @david_syer

• Ben Wilcock, @benbravo73

👮🏻‍♂️ Official accounts

• Akka Team, @akkateam

• Project Reactor, @ProjectReactor

• R2DBC, @r2dbc

• RSocket, @RSocketIO

• RxJava, @RxJava

• Eclipse Vert.x, @vertx_project

🏡 Sites

• Spring Blog

• Baeldung

• InfoQ: Reactive Programming

• DZone

🤝 Credits

• Coffee-love icon by The Noun Project ☕ ❤️