Guava Cache

Spring Boot starter cache is able to cache REST API response but expiring the cache will be troublesome to implement. Guava cache will solve this problem. Example below is a prototype from scratch on how to implement Guava cache.

Spring initializer

Add dependencies

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>23.0</version>
</dependency>

<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
</dependency>

Project folder structure

Below are the codes for
1. Book.java
2. BookController.java
3. CacheStore.java
4. CacheStoreBeans.java

I added a 2 seconds delay to simulate slow record retrieval from database.

I set the cache duration to 5 seconds.

By running a simulation in Bash. It is obvious that the first call took 2 seconds and subsequent calls are less than 1 second. Once the cache expires, it took 2 seconds again.

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