Bringing Reactive to Enterprise Java Developers

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Bring Reactive to Enterprise Java Developers Julien Ponge, PhD Principal Software Engineer @jponge julien.ponge@redhat.com 1

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Responsiveness MessageS Resilience Back-Pressure Streams System Manifesto Asynchrony Elasticity Data Flows Programming eXtensions Spreadsheets Events RX Java Reactor Spring Actor Fibers Non-Blocking MicroProfile REACTIVE ALL THE THING! 3

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4 REACTIVE SOFTWARE - A DEFINITION reactive | rēˈaktiv | adjective showing a response to a stimulus: pupils are reactive to light. • acting in response to a situation rather than creating or controlling it: a proactive rather than a reactive approach. • having a tendency to react chemically: nitrogen dioxide is a highly reactive gas. • Software - code reacting to stimuli such as user inputs, messages and failures

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5 REACTIVE SOFTWARE - A DEFINITION reactive | rēˈaktiv | adjective showing a response to a stimulus: pupils are reactive to light. • acting in response to a situation rather than creating or controlling it: a proactive rather than a reactive approach. • having a tendency to react chemically: nitrogen dioxide is a highly reactive gas. • Software - code reacting to stimuli such as user inputs, messages and failures Remain responsive under all conditions: load + failures

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6 ASYNCHRONOUS ALL THE THINGS! Events Messages Failures JVM Async toolkit Modern Distributed Systems

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-50% MICHELIN50 8

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VERT.X DEMO (data streaming) 9

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10 GATE

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LET’S TALK “EE” 11 Eclipse MicroProfile Eclipse JakartaEE

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12 FROM JAVA EE TO JAKARTA EE ‘14 Java EE 8 ‘17 ‘13 Java EE 7 ‘07 JAX-RS ‘09 CDI (Java EE 6) Microservices Docker Kubernetes Reactive manifesto ‘12 Vert.x Node.js MVC 1.0 ‘11 Kafka Serverless

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13 JAVA EE - A FOOT IN THE PAST CRUD DATABASE DEVELOPMENT MODEL CDI JAX-RS EJB EXECUTION MODEL SERVLETS 1 THREAD PER REQUESTS TYPICAL USE CASE Cloud-friendLY REACTIVE

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14 INTRODUCING REACTIVE TO EE Without breaking everything… Vert.x Ecosystem Reactive Streams Operators Reactive Messaging Concurrency

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15 REACTIVE AT MICROPROFILE Reactive Streams Operators Add reactive to other specs (Rest client, Fault Tolerance…) REACTIVE MESSAGING Creates, Manipulates and consumes reactive streams return ReactiveStreams .of("h", "e", "l", "l", “a") .map(s -> s.toUpperCase()) .distinct() .build(); }

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CONNECTED RABBIT DEMO * no rabbits were harmed in the making of this.

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17 RestEasy, server-sent events and reactive streams STEP #1 Server

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18 MicroProﬁle Reactive Messaging STEP #2 Server State HEALTH HEARTBEAT

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19 MicroProﬁle Reactive Streams Operators STEP #3 Server State HEALTH HEARTBEAT SNAPSHOT SERVICE HTTP HTTP

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20 Introducing connectors STEP #4 Server State HEALTH HEARTBEAT SNAPSHOT SERVICE HTTP HTTP MQTT

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PROCESSING LEAPS 21 Event-Driven Microservices STEP #5 State HEALTH HEARTBEAT SNAPSHOT SERVICE HTTP HTTP MQTT GATEWAY KAFKA SSE TEmperature

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-50% MICHELIN50 23

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