Terminology

• SmallRye - Out the box implementation of MicroProfiles, using JBoss stuff for getting up and running, basically "plugins", IBM competitor is openliberty

• MicroProfile - Eclipse MicroProfile, microservice framework composed of made up of (bare min)

  • JAX-RS - API for creating REST APIs
  • JSON-P - API for processing JSON
  • CDI 2.0 - Glue JAX-RS and JSON-P together dependency injection using java beans, share a class and manage its lifecycle
  • JSON-B - JSON binding (similar to jackson databind)
  • Open Tracing - standardise requests across multiple services
  • Other stuff like Metrics (prometheus), watchdogs, retry, circuit breakers etc

• Loom - Virtual threads approach to non-blocking IO (as opposed to event-loop)

• Quarkus

  • ArC - CDI (injection framework), developed from Weld
  • Command mode - terminates exits after run as opposed to normal operation (wait for systemexit or pod to be killed)

General Notes

Quarkus built upon VERT-X for non-blocking IO, VERT-X mostly built upon netty, Vert-X provides a 80+ connectors for non-blocking IO like Kafka, mongodb, AMQP etc Quarkus two main deploy modes - native (graalvm) and jvm, some things dont do so well natively

//Mutiny async construct, onItem <- the result, onFailure <- Failed calls
Uni<String> uni
uni.onItem()
.onFailure()

The Job spec

• Implement test scenarios and develop enterpirse applications for testing
• Design and develop testing frameworks in Java for various environments, like cloud, multiple operating systems, large clusters, and containers
• Provide root cause analysis for complex bugs reported by our customers and communicate the impact of these bugs to customers, developers, and support specialists
• Participate in defining testing strategies
• Analyze and prioritize the quality risks posed by Red Hat products and determine the tests required to mitigate these risks
• Serve as an internal advocate for our customers to ensure that the product goes to customers without usability or user experience issues; properly document relevant information
• Document new bugs and work with project managers and developers on prioritization and a fix
• Mentor junior team members
• Constantly learn new things and maintain an overview of current technologies like Java, MicroProfile, and Reactive programming

Technical Job specs

• Practical experience with Java EE, MicroProfile, or Spring development
• Experience with testing in Junit or TestNG beyond unit tests
• Experience with Maven, Git, Jenkins, continuous integration, and pipelines
• Debugging and performance tuning skills
• Ability to install and maintain Red Hat Enterprise Linux (RHEL) or UNIX-like operating systems; basic administration skills of Jenkins nodes

Main technologies to learn about

• Microprofile + SmallRye
• JUnit
• TestNG
• Jenkins, CI, piplines Blue Ocean

The plan

• Understand technologies and terminologies
• Fire up Quarkus example
• Design an LED conversion proxy for front porch
  • Listen to MQTT broker
  • Possibly use camel k to write mqtt to file or something
  • "Translate" and passthrough to porchLED

Refs

• What is microprofile
• What is SmallRye
• CDI explained
• Mutiny lib/Vert-X
• Weld