Caching with Spring Boot & Redis

Source Folder: Caching with Redis

Tech Stack:

• spring-boot
• spring-mvc
• spring-data-redis
• log4j2 (slf4j impl)
• project lombok

This is a ready-to-use Maven Java project template with the libraries listed above.

Problems Solved

• Reading data from cache (once it is read from the original source) until its TTL

Notes Taken on the Road

Create a Redis Docker Container

> docker pull redis
> docker run --name redis -p 6379:6379 -d redis

Jedis vs Lettuce

• Both are mature redis clients
• Lettuce is the default client that comes with the Spring-Boot-Starter-Data-Redis
• Redis is single threaded in terms of data access
  • Jedis is not thread safe when applications want to share a single Jedis instance across multiple threads
  • The approach to use Jedis in a multi-threaded environment is to use connection pooling (each thread gets its own Jedis instance)
  • Lettuce is built in netty and connection instances can be shared across multiple threads

Redis Cache Manager In spring boot, RedisCacheManager is autoconfigured:

• Spring cache configurations using "spring.cache.*"" property
• redis cache configurations using "spring.cache.redis.*" property

NOTE: All default configurations of Spring-Boot are in the files:

spring-configuration-metadata.json
additional-spring-configuration-metadata.json