Caching is a technique used in software applications to improve the performance and speed of the application by storing frequently accessed data in memory. This allows the application to quickly retrieve the data from the cache, instead of having to fetch it from a slower data store like a database.
In a Spring Boot application, caching is typically implemented using @Cacheable annotation. This annotation is applied to a method to indicate that the method's return value should be cached. For example, consider the following code:
@Service
public class UserService {
@Cacheable(“users”)
public User getUserById(long id) {
// code to fetch the user from the database goes here
}
}
In this code, the getUserById() method is annotated with @Cacheable("users"). This tells Spring Boot to cache the return value of the method in a cache named "users". The next time the getUserById() method is called with the same id argument, the value will be retrieved from the cache instead of being fetched from the database.
To enable caching in a Spring Boot application, you must first add the spring-boot-starter-cache dependency to your project. You must also enable caching by adding the @EnableCaching annotation to one of your @Configuration classes.
For more information on how to use caching in a Spring Boot application, see the Spring Boot documentation.
