A Java library for rate limiting, assembled using extensible storage and application framework adaptors. The library's interfaces support thread-safe sync, async, and reactive usage patterns.

RateLimitJ provides the following stable plugable modules:

• Redis sliding window rate limiter
• In-memory sliding window rate limiter
• Dropwizard integration

• Uses an efficient approximated sliding window algorithm for rate limiting
• Multiple limit rules per instance

Binaries and dependency information for Maven, Ivy, Gradle and others can be found at Maven Central.

Example for Maven:

<dependency>
  <groupId>es.moki.ratelimitj</groupId>
  <artifactId>ratelimitj-redis</artifactId>
  <version>${ratelimitj-redis.version}</version>
</dependency>

• RateLimitJ requires Java 8

RateLimitJ is built with Gradle and requires a local Redis for the Redis module. Running docker-compose up -d will start Redis.

To build:

$ git clone https://github.com/mokies/ratelimij.git
$ cd ratelimij/
$ docker-compose up -d
$ ./gradlew

This library was inspired by the following articles on sliding window rate limiting with Redis:

• Introduction to Rate Limiting with Redis Part 1
• Introduction to Rate Limiting with Redis Part 2

• Stripe Blog - Scaling your API with rate limiters
• An alternative approach to rate limiting

• Craig Baker