JAlgoArena Judge Agent is heart of JAlgoArena platform. It is responsible for generation of skeleton code as well as judging submissions based on requirements specified in problem definition.

Demo: https://jalgoarena-ui.herokuapp.com/

• Introduction
• REST API
• Components
• Continuous Delivery
• Infrastructure
• Running Locally
• Notes

• JAlgoArena Judge Agent can be easily scalable - it's stateless and together with Eureka and API using Ribbon load balancer gives unlimited way to scale judgement capability
• It supports Kotlin and Java
• JAlgoArena Judge Agent is generating skeleton code for particular problem - based on meta data received from Problems Service
• It judges correctness of the solution based on the pre-specified test cases as well as time and memory limits
• It's using simple heuristic to calculate time and memory results - running in couple iteration and looking for best results makes the judgement itself more predictable and repeatable

• JAlgoArena
• JAlgoArena UI
• JAlgoArena Judge
• JAlgoArena Problems
• JAlgoArena Eureka Server
• JAlgoArena API Gateway

• initially, developer push his changes to GitHub
• in next stage, GitHub notifies Travis CI about changes
• Travis CI runs whole continuous integration flow, running compilation, tests and generating reports
• coverage report is sent to Codecov
• application is deployed into Heroku machine

• Heroku (PaaS)
• Kotlin Compiler (K2JVMCompiler), MemoryClassLoader, MemoryJavaCompiler
• Spring Boot, Spring Cloud (Eureka Client)
• TravisCI - https://travis-ci.org/spolnik/JAlgoArena-Judge

There are two ways to run it - from sources or from binaries.

• Default port: 8080

• go to releases page and download last app package (JAlgoArena-Judge-[version_number].zip)
• after unpacking it, go to folder and run ./run.sh
• you can modify port Eureka service url in run.sh script, depending on your infrastructure settings. The script itself can be found in here: run.sh

• run git clone https://github.com/spolnik/JAlgoArena-Judge to clone locally the sources
• now, you can build project with command ./gradlew clean bootRepackage which will create runnable jar package with app sources. Next, run java -Dserver.port=8080 -classpath "lib/*" -jar build/libs/jalgoarena-auth-*.jar which will start application
• there is second way to run app with gradle. Instead of running above, you can just run ./gradlew clean bootRun

• Travis Builds