Demo Project for my Youtube talks

• Part 1: Headache-Free Reactive Programming With Spring Boot and Kotlin Coroutines:
  • https://www.youtube.com/watch?v=ahTXElHrV0c&ab_channel=KotlinbyJetBrains
• Part 2: Headache-Free Reactive Programming With Spring Boot and Kotlin Coroutines - Adding Virtual Threads to the mix
  • https://www.youtube.com/watch?v=szl3eWA0VRw&lc=UgyA1j8C3_TlfQhXCcp4AaABAg&ab_channel=KotlinbyJetBrains

Check out our Kotlin courses and upskilling programs!

• https://xebia.com/academy/nl/upskilling/kotlin-academy/

Installation

Install Java 21

• Install openjdk 21

Install baton commandline perf tool

• See instructions at: https://github.com/americanexpress/baton

Create curltime

• Add ~/.curl-format.txt with the following content:

  TOTAL TIME:  %{time_total}s\n
  ===========================\n```
  

• in !/.bash_profile add the following entry: alias curltime="curl -w \"@$HOME/.curl-format.txt\" -o NUL -s "
• source ~/.bash_profile

Start remote server

For the samples to run, we need to talk to a remote server.

• Go to the folder node-server
• execute: build.sh
• execute: run.sh

All demo examples

Blocking

• Disable Virtual Threads: spring.threads.virtual.enabled=true

curl  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/blocking/users\?delay\=200 | jq
curltime  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/blocking/users\?delay\=200
baton -m POST -u http://localhost:8085/blocking/users?delay=2000 -z users-blocking.csv  -c 100 -r 110

Reactor

curl  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/reactorj/users\?delay\=200 | jq
curltime  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/reactorj/users\?delay\=200
baton -m POST -u http://localhost:8083/reactorj/users?delay=2000 -z users-reactive.csv  -c 100 -r 110

Coroutines

curl  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/users\?delay\=200 | jq
curltime  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/users\?delay\=200
baton -m POST -u http://localhost:8085/users?delay=2000 -z users-coroutines.csv  -c 100 -r 110

Blocking with Virtual Threads

• Enable Virtual Threads: spring.threads.virtual.enabled=true

curl  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/blocking/users\?delay\=200 | jq
curltime  -X POST -H "Content-Type: application/json" -d '{"id":null,"userName":"Jack","email":"Rabbit@hi.nl","avatarUrl":null}' http://localhost:8085/blocking/users\?delay\=200
baton -m POST -u http://localhost:8085/blocking/users?delay=2000 -z users-blocking.csv  -c 100 -r 110