Question: How to Refresh Redis Cache in Spring Boot?

Answer

To refresh the Redis cache in a Spring Boot application, you can use the CacheManager interface provided by Spring. This interface allows you to manage and manipulate caches programmatically, including refreshing cache entries.

Here's a guide on how to refresh Redis cache in Spring Boot:

1. Configure cache manager in your Spring Boot application: In your configuration class, create a method annotated with @Bean that returns a RedisCacheManager instance.

@Configuration
@EnableCaching
public class CacheConfiguration {

    @Autowired
    private RedisConnectionFactory redisConnectionFactory;

    @Bean
    public CacheManager cacheManager() {
        RedisCacheConfiguration cacheConfiguration = 
            RedisCacheConfiguration.defaultCacheConfig()
                                   .entryTtl(Duration.ofMinutes(10)); // Set time to live

        return RedisCacheManager.builder(redisConnectionFactory)
                                .cacheDefaults(cacheConfiguration)
                                .transactionAware()
                                .build();
    }
}

2. Programmatically refresh the cache using CacheManager: Inject the CacheManager bean into your service or component class and use it to clear and reload cache entries.

@Service
public class YourService {

    @Autowired
    private CacheManager cacheManager;

    // A method to refresh your cache
    public void refreshCache(String cacheName) {
        Cache cache = cacheManager.getCache(cacheName);
        if (cache != null) {
            cache.clear(); // Clearing the cache
        }
    }

    // Other methods and code for your service
}

3. Call the refreshCache method from your controller or another class to refresh the cache:

@RestController
@RequestMapping("/api")
public class YourController {

    @Autowired
    private YourService yourService;

    @PutMapping("/refresh-cache/{cacheName}")
    public ResponseEntity<String> refreshCache(@PathVariable String cacheName) {
        yourService.refreshCache(cacheName);
        return ResponseEntity.ok("Cache " + cacheName + " has been refreshed.");
    }

    // Other methods and code for your controller
}

Now, you can call the /api/refresh-cache/{cacheName} endpoint to refresh the specific Redis cache in your Spring Boot application.