Redlin A very simple Redis implementation.

Overview

I'm learning Kotlin and after reading Kotlin: An Illustrated Guide and Kotlin Design Patterns and Best Practices, I decided to give this a go taking advantage of the structure in the CodeCrafters challenge.

So take this for what it is: a learning project.

At the moment it is essentially a wrapper for a ConcurrentHashMap.

This code is heavily inspired by Rust Projects - Write a Redis Clone and resp-kotlin.

Run

Run it with ./gradlew run then you can just use a normal redis-cli to communicate with the Redlin server.

Supported Commands

• GET
• SET
  • Expiration supported with EX (seconds) and PX (milliseconds)
  • Set only if it does not exist with NX
  • Set only if it exists with XX
• ECHO
• PING

To Do

• Add periodic eviction, currently only lazy eviction is supported.
• Implement basic transaction to support INCR.
• Implement support for lists
• Aim to use the coroutines properly and stop using ConcurrentHashMap by potentially implementing an Actor pattern.
• RDB Persistence
• Replication
• Proper logging
• Tests