SERVERLESS AND EVENT-DRIVEN MICROSERVICES WITH MICRONAUT

MICHAEL CARDUCCI@MICHAELCARDUCCI

MICHAEL@MAGICIAN.CODES

AGENDA

• What is Micronaut• Why another framework?• The challenges of Microservices• Installation• The Micronaut CLI• Hello World Service• Inter-service Communication• RabbitMQ• Event-Driven Microservices• Writing and Deploying Serverless Functions

WHAT IS MICRONAUT?

”

“A MODERN, JVM-BASED, FULL-

STACK FRAMEWORK FOR BUILDING MODULAR, EASILY TESTABLE

MICROSERVICE APPLICATIONS. OCI

WHY (YET) ANOTHER FRAMEWORK?

GRAILS (CIRCA 2006)

THERE HAD TO BE A BETTER WAY

A LOT HAS CHANGED SINCE THEN

GRAILS THEN AND NOW

• Monoliths were the dominant pattern

• No major JS frameworks yet

• No Docker

• Cloud was very different

• …A lot can change in 12 years

• Microservices are becoming a dominant pattern

• The way we build web apps has completely changed

• The way we deploy apps has completely changed

• The framework evolves with the times

2006 2018

• Fast Startup Time• Reduced Memory Footprint• Minimal Use of Reflection• Minimal Use of Proxies• As small as possible JAR sizes• Zero Dependencies

• Fast Startup Time• Reduced Memory Footprint• Minimal Use of Reflection• Minimal Use of Proxies• As small as possible JAR sizes• Zero Dependencies

• Fast Startup Time• Reduced Memory Footprint• Minimal Use of Reflection• Minimal Use of Proxies• As small as possible JAR sizes• Zero Dependencies

THE RESULTS

• JAR files

• 8MB in Java

• 12 MB in Groovy

• Spring and Groovy – 36MB

• Grails – 27 MB

• Heap size

• 7MB in Java

• 19 MB in Groovy

• Spring and Groovy – 33 MB

• Grails – 49 MB

• Startup time

• Java ~1 second

• Spring / Grails ~3-4 seconds

HOW?

• Compile time dependency Injection & AOP for Groovy, Java and Kotlin

• AST Transforms for Groovy, Annotation processors for Java/Kotlin

• Annotation Metadata produced at compile Time

• Reflection Free and No Reflection Data Caching

SPRING (AND GRAILS) ARE EXPENSIVE

Read the bytecode

01Synthesize new annotations

02Build reflection metadata

03

SPRING (AND GRAILS) ARE EXPENSIVE

Read the bytecode

01Synthesize new annotations

02Build reflection metadata

03

THE CHALLENGE

• Spring (and grails) offer a productivity and a great programming model

• With Spring (and grails) non-trivial apps get bloated quickly

• There has to be a better way

• Designed from the ground up with microservices in mind

• Ultra-lightweight and reactive – Based on Netty• Integrated AOP and Compile-time DI• HTTP Client & Server

NATIVELY CLOUD NATIVE

• Service discovery / orchestration• Configuration• Immutable Deployments• Efficient service interaction• Elastic scaling• Cloud Awareness• Monitoring• Tracing• Security• Resilience (also degrading)• Cloud Functions

INSTALLING MICRONAUT

INSTALLING MICRONAUT

Download the Binariesmicronaut.io/download.html

Extract

Create MICRONAUT_HOME env var to point to extract location

Update PATH to include %MICRONAUT_HOME%/bin

INSTALLING MICRONAUT

INSTALLING MICRONAUT

LET’S DIVE IN…

EVENT DRIVEN MICROSERVICES

MICRONAUT + RABBITMQ

RabbitMQ is an open-source message-broker software that originally implemented the Advanced Message Queuing Protocol (AMQP) and has since been extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol (STOMP), Message Queuing Telemetry Transport (MQTT), and other protocols.git clone https://github.com/micronaut-guides/micronaut-rabbitmq.git

LET’S BUILD THIS

WRITING SERVERLESS FUNCTIONS

SUPPORTED INTERFACES

• Supplier

• Consumer

• BiConsumer

• Function

• BiFunction

CREATING A FUNCTION

FUNCTION BODY

FUNCTION CLIENT

FUNCTION CLIENT

FUNCTION CLIENT

MANUAL CONFIGURATION

ADD PROVIDER TO BUILD FILE

SET YOUR PROJECT’S MAIN CLAS

CONFIGURING FUNCTION TO EXECUTE –APPLICATION.YML

CONFIGURING FUNCTION TO EXECUTE - DOCKER

THANK YOU!MICHAEL CARDUCCI

@MICHAELCARDUCCIMICHAEL@MAGICIAN.CODES

ACKNOWLEDGEMENTS + RESOURCES

• Micronaut Guides - https://guides.micronaut.io/

• Ivan Lopez – RabbitMQ and Micronaut - https://guides.micronaut.io/micronaut-rabbitmq/guide/index.html

• Micronaut Docs - https://docs.micronaut.io/latest/guide/index.html#messaging

• What is a Reactive Microservice - https://www.oreilly.com/ideas/what-is-a-reactive-microservice