How to remove the entire cache, and then pre-populate the cache? - spring-boot

Question

Can someone tell me what is the problem with below implementation. I'm trying to delete the entire cache, secondly, I then want to pre-populate/prime the cache. However, what I've below is only deleting both caches, but not pre-populating/priming the cache, when the two methods are executed. Any idea?
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.Caching;
#Cacheable(cacheNames = "cacheOne")
List<User> cacheOne() throws Exception {...}
#Cacheable(cacheNames = "cacheOne")
List<Book> cacheTwo() throws Exception {...}
#Caching (
evict = {
#CacheEvict(cacheNames = "cacheOne", allEntries = true),
#CacheEvict(cacheNames = "CacheTwo", allEntries = true)
}
)
void clearAndReloadEntireCache() throws Exception
{
// Trying to reload cacheOne and cacheTwo inside this method
// Is this even possible? if not what is the correct approach?
cacheOne();
cacheTwo();
}
I've spring boot application (v1.4.0), more importantly, utilizing the following dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
<version>1.0.0</version>
</dependency>

Answer 1

If you call the clearAndReloadEntireCache() method, only this method will be processed by the caching interceptor. Calling other methods of the same object: cacheOne() and cacheTwo() will not cause cache interception at runtime, although both of them are annotated with #Cacheable.
You could achieve desired functionality by reloading cacheOne and cacheTwo with two method calls shown below:
#Caching(evict = {#CacheEvict(cacheNames = "cacheOne", allEntries = true, beforeInvocation = true)},
cacheable = {#Cacheable(cacheNames = "cacheOne")})
public List<User> cleanAndReloadCacheOne() {
return cacheOne();
}
#Caching(evict = {#CacheEvict(cacheNames = "cacheTwo", allEntries = true, beforeInvocation = true)},
cacheable = {#Cacheable(cacheNames = "cacheTwo")})
public List<Book> cleanAndReloadCacheTwo() {
return cacheTwo();
}