I have the following code that technically should cache a lookup table. The Java compiler compiles fine and the program runs, however the dataset is not cached and it keeps doing a database lookup every time the method is called.
What do I need to do in order to enforce that once the database runs the dataset, that it does cache it and that the cache is referenced instead of continued database queries:
@Cacheable(value = "eventTypes", key = "#p0")
public List<EventType> getEventTypes() {
String sql = "select * from event_types ";
return jdbcTemplate.query(sql, new Object[] {},
(rs, rowNum) -> EventType.builder()
.eventTypeId(rs.getLong("event_type_id"))
.description(rs.getString("description"))
.build()
);
}
As I note, I also have this in my application.properties file, which apparently is needed;
cache:
cache-names:eventTypes,users
Following Spring documents (Official Spring Cache Docs):
You need a valid configuration class:
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableCaching
public class CacheConfig {
// your configuration for the cache
}
And then, wrap your code in a bean, like a component or a service layer:
@Service
public class YourService {
@Cacheable(value = "eventTypes", key = "#p0")
public List<EventType> getEventTypes() {
String sql = "select * from event_types ";
return jdbcTemplate.query(sql, new Object[] {},
(rs, rowNum) -> EventType.builder()
.eventTypeId(rs.getLong("event_type_id"))
.description(rs.getString("description"))
.build()
);
}
}
Ensure Spring Boot's spring-boot-starter-cache is in your pom or gradle file, without version (so SpringBoot parent can pick the correct version).
For advanced configurations, refer to Spring's official documentation: