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Spring Boot Cache

Spring Boot Cache provides a declarative caching abstraction that simplifies adding caching to your application. It supports multiple cache providers including Redis, Caffeine, EhCache, and Hazelcast, allowing you to improve application performance by caching frequently accessed data.

Key Features

Declarative Caching

Use annotations like @Cacheable, @CacheEvict, and @CachePut to add caching without boilerplate code.

Multiple Providers

Support for various cache providers including Redis, Caffeine, EhCache, Hazelcast, and simple in-memory cache.

Cache Abstraction

Switch between cache providers without changing application code.

Conditional Caching

Cache entries conditionally based on method parameters or results.

Use Cases

Database Query Caching: Caching expensive database queries to reduce load
API Response Caching: Caching external API responses to improve response times
Computation Caching: Caching expensive computations and calculations
Session Caching: Storing session data in distributed cache systems
Performance Optimization: Improving application performance by reducing redundant operations

Example Usage

Enable caching and use annotations:

@SpringBootApplication
@EnableCaching
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

@Service
public class UserService {
    
    @Cacheable(value = "users", key = "#id")
    public User getUser(Long id) {
        return userRepository.findById(id);
    }
    
    @CacheEvict(value = "users", key = "#user.id")
    public void updateUser(User user) {
        userRepository.save(user);
    }
    
    @CachePut(value = "users", key = "#user.id")
    public User saveUser(User user) {
        return userRepository.save(user);
    }
}

Dependencies

Add cache starter and provider (e.g., Redis):

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

Configuration

Configure Redis cache in application.properties:

spring.cache.type=redis
spring.redis.host=localhost
spring.redis.port=6379
spring.cache.redis.time-to-live=600000