AsyncReactiveProgramming

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= Asynchronous & reactive programming with Java Marcos de la Calle Samaniego, @marcosDLCS [email protected] v1.0.4, 2020-12-20 :toc:

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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: https://www.codeurjc.es/mastercloudapps/[Máster Cloud Apps. Desarrollo y despliegue de aplicaciones en la nube, window=_blank] [ 🇪🇸 ]

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

[cols="9,4,3,3,1"] |=== |Name |Version |Download |Updated at | Lang

| Presentación: Programación asíncrona y reactiva con Java | 1.0.0 | https://drive.google.com/file/d/1Whum-P6f5nqzq3Qj55C-p2DNLFvEKDBC/view?usp=sharing[pptx, window=blank] or https://drive.google.com/file/d/1bnDI5x$$$$jeQ1uV9MXXmi8-jbUGZ0Rfm9Z/view?usp=sharing[pdf, window=_blank] | 2020-12-08 | 🇪🇸

| Slides: Asynchronous and reactive programming with Java | 0.0.3 | https://drive.google.com/file/d/1vfMmL__LiVgOm2fLsEiZVVHBcqgiD4Ez/view?usp=sharing[pptx, window=_blank] or https://drive.google.com/file/d/11zZQBMAHh0cgV2gVhK-6L5KEZ4i9-hSv/view?usp=sharing[pdf, window=_blank] | 2020-11-18 | 🇬🇧 |===

=== 👩🏻‍🏫 Academic resources

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

[cols="9,4,3,3,1"] |=== |Name |Version |Download |Updated at | Lang

| Memoria: Programación asíncrona y reactiva con Java | 1.0.0 | https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/resources/academic/memoria.pdf[pdf, window=_blank] | 2020-12-14 | 🇪🇸

| Presentación: Programación asíncrona y reactiva con Java | 1.0.0 | https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/resources/academic/presentacion_tfm.pdf[pdf, window=_blank] | 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 https://spring.io/projects/spring-boot[Spring Boot (2.4+), window=_blank].

https://maven.apache.org/[Maven (3.6+), window=_blank] or https://gradle.org/[Gradle (6+), window=_blank] will be used as build/dependency management tool. In addition, some examples will use the https://projectlombok.org/[Lombok, window=_blank] library to generate code through annotations

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/00-reactor-operators[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

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/01-basic-comparison[Example 01. Basic comparison]: Basic CRUD API (GET, POST, PUT, DELETE) in two flavors, Spring MVC and Spring WebFlux

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/02-using-spring-webclient[Example 02. Using Spring WebClient]: Basic API to retrieve information from remote web services using the reactive WebClient

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/03-gateway[Example 03. Gateway!]: Gateway service to route requests to worker services to practice with Spring Cloud Gateway project

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/04-reactive-db-access-with-r2dbc[Example 04. Reactive DB access with R2DBC]: Simple API with an internal relational PostgreSQL repository. R2DBC provides reactive non-blocking APIs to relational databases

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/05-rsocket[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

• https://github.com/MasterCloudApps-Projects/AsyncReactiveProgramming/tree/master/examples/06-project-loom[Example 06. Project Loom]: Example for a first contact with Project Loom, its implementation and how to start with Virtual Threads

== 🔗 Resources

=== 👼🏻 Fundamentals

• https://www.reactive.foundation/[Reactive foundation, window=_blank]
• https://www.reactivemanifesto.org/[The reactive manifesto, window=_blank]
• https://principles.reactive.foundation/[The reactive principles, window=_blank]
• https://12factor.net/[12 Factor App, window=_blank]
• https://www.reactive-streams.org/[Reactive Streams Specification, window=_blank]
• https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/Flow.html[Java 11 Flow, window=_blank]
• https://projectreactor.io/[Project Reactor, window=_blank]

=== 👨‍👩‍👧‍👦 Main Reactive Streams implementations

• https://projectreactor.io/[Project Reactor, window=_blank]
• https://github.com/ReactiveX/RxJava[RxJava, window=_blank]
• https://vertx.io/[VertX, window=_blank]
• https://doc.akka.io/docs/akka/current/stream/index.html[Akka Streams, window=_blank]

=== 🍀 Spring ecosystem

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

• https://docs.spring.io/spring-framework/docs/current/reference/html[Spring Framework Docs, window=_blank]
• https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle[Spring Boot Docs, window=_blank]
• https://projectreactor.io/docs/core/release/reference[Project Reactor Docs, window=_blank]

[cols="6,3,2,1"] .Interesting videos and articles about Reactive Spring |=== |Name |Author |Year |Info

| https://www.infoq.com/presentations/spring-reactive-webflux[Guide to "Reactive" for Spring MVC Developers, window=_blank] | Rossen Stoyanchev | 2018 | 🇬🇧 📹

| https://www.youtube.com/watch?v=vSHNBgY7MGA&ab_channel=SpringI%2FO[Moving from Imperative to Reactive, window=_blank] | Paul Harris | 2019 | 🇬🇧 📹

| https://hazelcast.com/blog/migrating-from-imperative-to-reactive[Migrating from Imperative to Reactive, window=_blank] | Nicholas Frankel | 2020 | 🇬🇧 📋

| https://www.youtube.com/watch?v=0rnMIueRKNU&ab_channel=SpringDeveloper[Do’s and Don’ts: Avoiding First-Time Reactive Programmer Mines, window=_blank] |Sergei Egorov |2019 |🇬🇧 📹

| https://www.youtube.com/watch?v=ODzY5uJfzDI&ab_channel=SpringI%2FO[Benefits of reactive programming with Reactor and Spring Boot 2, window=_blank] | Violeta Georgieva | 2019 | 🇬🇧 📹

| https://www.youtube.com/watch?v=xCu73WVg8Ps&ab_channel=SpringDeveloper[Avoiding Reactor Meltdown, window=_blank] | Phil Clay | 2019 | 🇬🇧 📹

| https://www.youtube.com/watch?v=pyqIpqCt8PU&ab_channel=vJUG[Reactive Performance, window=_blank] | Oleh Dokuka | 2019 | 🇬🇧 📹

| https://www.youtube.com/watch?v=qwF6v6FN_Uc&ab_channel=SpringDeveloper[Getting Started with R2DBC, window=_blank] | Mark Heckler | 2018 | 🇬🇧 📹

| https://www.youtube.com/watch?v=ipVfRdl5SP0&ab_channel=SpringDeveloper[The RSocket Revolution, window=_blank] | Josh Long | 2020 | 🇬🇧 📹

| https://www.youtube.com/watch?v=hfupNIxzNP4&ab_channel=SpringI%2FO[Flight of the Flux: A look at Reactor execution model, window=_blank] | Simon Baslé | 2018 | 🇬🇧 📹

| https://spring.io/blog/2019/03/06/flight-of-the-flux-1-assembly-vs-subscription[Flight of the Flux 1 - Assembly vs Subscription, window=_blank] | Simon Baslé | 2019 | 🇬🇧 📋

| https://spring.io/blog/2019/04/16/flight-of-the-flux-2-debugging-caveats[Flight of the Flux 2 - Debugging Caveats, window=_blank] | Simon Baslé | 2019 | 🇬🇧 📋

| https://spring.io/blog/2019/12/13/flight-of-the-flux-3-hopping-threads-and-schedulers[Flight of the Flux 3 - Hopping Threads and Schedulers, window=_blank] | Simon Baslé | 2019 | 🇬🇧 📋

| https://projectreactor.io/docs/core/release/reference/#which-operator[Project Reactor: Which operator do I need? (Appendix A), window=_blank]

=== 🌈 Other framework ecosystems

[cols="6,3,1,2,1"] .Interesting videos and articles about other frameworks and ecosystems |=== |Name |Author |Year | Ecosystem| Info

| https://www.youtube.com/watch?v=kWlrGtwvOxg&ab_channel=RedHatDeveloper/[Reactive Quarkus–A Java Mutiny, window=_blank] | Clement Escoffier | 2020 | Quarkus | 🇬🇧 📹

| https://www.youtube.com/watch?v=EvkSWuo7Mig&ab_channel=Autentia[Microservicios reactivos con Micronaut] | Iván López | 2019 | Micronaut |🇪🇸 📹

| https://piotrminkowski.com/2019/11/12/micronaut-tutorial-reactive/[Micronaut Tutorial: Reactive] | Piotr Minkowski | 2019 | Micronaut |🇬🇧 📋 |===

=== ☕ Project Loom

First and foremost: What is Project Loom?

According to https://wiki.openjdk.java.net/display/loom/Main[OpenJDK Wiki, window=_blank]:

==== 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 ====

[cols="6,3,2,1"] .Interesting articles and resources about Project Loom |=== |Name |Author |Year |Info

| https://youtu.be/23HjZBOIshY/[Project Loom: Modern Scalable Concurrency for the Java Platform, window=_blank] | Ron Pressler | 2020 | 🇬🇧 📹

| https://inside.java/2020/08/07/loom-performance/[On the performance of user-mode threads and coroutines, window=_blank] | Ron Pressler | 2020 | 🇬🇧 📋

| https://blog.frankel.ch/project-loom-reactive-coroutines/[On Project Loom, the Reactive model and coroutines, window=_blank] | Nicholas Frankel | 2020 | 🇬🇧 📋

| https://i-rant.arnaudbos.com/loom-part-0-rationale/[Loom - Part 0 - Rationale, window=_blank] |Arnaud Bos |2019 |🇬🇧 📋

| https://i-rant.arnaudbos.com/loom-part-1-scheduling/[Loom - Part 1 - It's all about Scheduling, window=_blank] | Arnaud Bos | 2019 | 🇬🇧 📋

| https://i-rant.arnaudbos.com/loom-part-2-blocking/[Loom - Part 2 - Blocking code, window=_blank] | Arnaud Bos | 2019 | 🇬🇧 📋

| https://i-rant.arnaudbos.com/loom-part-3-async/[Loom - Part 3 - Asynchronous code, window=_blank] | Arnaud Bos | 2019 | 🇬🇧 📋

| https://i-rant.arnaudbos.com/loom-part-4-nio/[Loom - Part 4 - Non-thread-blocking async I/O, window=_blank] | Arnaud Bos | 2020 | 🇬🇧 📋

| https://paluch.biz/blog/182-experimenting-with-project-loom-eap-and-spring-webmvc.html[Experimenting with Project Loom EAP and Spring WebMVC, window=_blank] | Mark Paluch | 2020 | 🇬🇧 📋

| https://www.javaadvent.com/2020/12/project-loom-and-structured-concurrency.html[Project Loom and structured concurrency, window=_blank] | Cay Horstmann | 2020 | 🇬🇧 📋 |===

=== ⚒️ Libraries and tools

[cols="2,5"] .Recommended libraries and tools |=== |Name |Description

| https://visualvm.github.io/[VisualVM, window=_blank] | VisualVM is a visual tool integrating commandline JDK tools and lightweight profiling capabilities. Designed for both development and production time use

| https://github.com/openjdk/jmc[Java Mission Control, window=_blank] | Mission Control is an open source production time profiling and diagnostics tool for Java

| http://www.awaitility.org/[Awaitility, window=_blank] | Awaitility is a DSL that allows you to express expectations of an asynchronous system in a concise and easy to read manner

| https://github.com/reactor/BlockHound[BlockHound, window=_blank] | Java agent to detect blocking calls from non-blocking threads

| https://github.com/reactor/reactor-core/tree/master/reactor-tools[Reactor Tools, window=_blank] | 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

| https://github.com/reactor/reactor-addons[Reactor Addons, window=_blank] | Reactor-adapter and reactor-extras utils

| https://github.com/reactor/reactor-core/tree/master/reactor-tools[Rx Marbles, window=_blank] | A webapp for experimenting with diagrams of Rx Observables, for learning purposes |===

=== 📕 Books

[cols="6,3,2,1"] .Recommended books |=== |Name |Author |Year |Lang

| https://www.goodreads.com/book/show/21799444-reactive-design-patterns[Reactive Design Patterns, window=_blank] | Roland Kuhn, Jamie Allen | 2014 | 🇬🇧

| https://www.goodreads.com/book/show/23752020-reactive-application-development[Reactive Application Development, window=_blank] | Sean Walsh, Duncan K. DeVore, Brian Hanafee | 2018 | 🇬🇧

| https://www.goodreads.com/book/show/28321006-reactive-programming-with-rxjava[Reactive Programming with RxJava: Creating Asynchronous, Event-Based Applications, window=_blank] | Tomasz Nurkiewicz, Ben Christensen | 2016 | 🇬🇧

| https://www.goodreads.com/book/show/53722460-hacking-with-spring-boot-2-3[Hacking with Spring Boot 2.3: Reactive Edition, window=_blank] | Greg L. Turnquist | 2020 | 🇬🇧

| https://www.goodreads.com/book/show/49450069-reactive-spring[Reactive Spring, window=_blank] | Josh Long | 2020 | 🇬🇧

| https://www.goodreads.com/book/show/55182022-spring-boot[Spring Boot: Up and Running: Building Cloud Native Java and Kotlin Applications, window=_blank] | Mark Heckler | 2021 | 🇬🇧 |===

=== 👣 Courses

[cols="6,3,2,1"] .Recommended courses |=== |Name |Author |Platform |Lang

| https://www.youtube.com/playlist?list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4[Java concurrency and multithreading (playlist), window=_blank] | Jakob Jenkov | Youtube | 🇬🇧

| https://www.udemy.com/course/efficient-java-multithreading-with-executors/[Efficient Java Multithreading and Concurrency with Executors, window=_blank] | Arun Kumar | Udemy | 🇬🇧

| https://learning.oreilly.com/library/view/reactive-spring-boot/9780136836421/[Reactive Spring, 2nd Edition, window=_blank] | Josh Long | Oreilly | 🇬🇧 |===

== 🚶‍♀️ Who to follow?

=== 👩🏻‍💻 People

• Simon Baslé, https://twitter.com/simonbasle[@simonbasle, window=_blank]
• Jonas Bonér, https://twitter.com/jboner[@jboner, window=_blank]
• Arnaud Bos, https://twitter.com/arnaud_bos[@arnaud_bos, window=_blank]
• Oleh Dokuka, https://twitter.com/OlehDokuka[@OlehDokuka, window=_blank]
• Sergei Egorov, https://twitter.com/bsideup[@bsideup, window=_blank]
• Clement Escoffier, https://twitter.com/clementplop[@clementplop, window=_blank]
• Nicholas Frankel, https://twitter.com/nicolas_frankel[@nicolas_frankel, window=_blank]
• Violeta Georgieva, https://twitter.com/violeta_g_g[@violeta_g_g, window=_blank]
• Mark Heckler, https://twitter.com/mkheck[@mkheck, window=_blank]
• David Karnok, https://twitter.com/akarnokd[@akarnokd, window=_blank]
• Josh Long, https://twitter.com/starbuxman[@starbuxman, window=_blank]
• Audrey Neveu, https://twitter.com/Audrey_Neveu[@Audrey_Neveu, window=_blank]
• Mark Paluch, https://twitter.com/mp911de[@mp911de, window=_blank]
• Ron Pressler, https://twitter.com/pressron[@pressron, window=_blank]
• Rossen Stoyanchev, https://twitter.com/rstoya05[@rstoya05, window=_blank]
• Dave Syer, https://twitter.com/david_syer[@david_syer, window=_blank]
• Ben Wilcock, https://twitter.com/benbravo73[@benbravo73, window=_blank]

=== 👮🏻‍♂️ Official accounts

• Akka Team, https://twitter.com/akkateam[@akkateam, window=_blank]
• Project Reactor, https://twitter.com/ProjectReactor[@ProjectReactor, window=_blank]
• R2DBC, https://twitter.com/r2dbc[@r2dbc, window=_blank]
• RSocket, https://twitter.com/RSocketIO[@RSocketIO, window=_blank]
• RxJava, https://twitter.com/RxJava[@RxJava, window=_blank]
• Eclipse Vert.x, https://twitter.com/vertx_project[@vertx_project, window=_blank]

=== 🏡 Sites

• https://spring.io/blog/[Spring Blog, window=_blank]
• https://www.baeldung.com/[Baeldung, window=_blank]
• https://www.infoq.com/reactive-programming/[InfoQ: Reactive Programming, window=_blank]
• https://dzone.com/[DZone, window=_blank]

== 🤝 Credits

• Coffee-love https://thenounproject.com/term/coffee-lover/1949347/[icon, window=_blank] by https://thenounproject.com/[The Noun Project, window=_blank] ☕ ❤️