使用Spring Cache如何实现多级缓存

<dependency>
  <groupId>com.pig4cloud.plugin</groupId>
  <artifactId>multilevel-cache-spring-boot-starter</artifactId>
  <version>0.0.1</version>
</dependency>

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

@Cacheable(value = "get",key = "#key")
@GetMapping("/get")
public String get(String key){
  return "success";
}

public class RedisCaffeineCacheManager implements CacheManager {

	@Override
	public Cache getCache(String name) {
		Cache cache = cacheMap.get(name);
		if (cache != null) {
			return cache;
		}
		cache = new RedisCaffeineCache(name, stringKeyRedisTemplate, caffeineCache(), cacheConfigProperties);
		Cache oldCache = cacheMap.putIfAbsent(name, cache);
		log.debug("create cache instance, the cache name is : {}", name);
		return oldCache == null ? cache : oldCache;
	}
}

public class RedisCaffeineCache extends AbstractValueAdaptingCache {
	protected Object lookup(Object key) {
		Object cacheKey = getKey(key);

  // 1. 先调用 caffeine 查询是否存在指定的值
		Object value = caffeineCache.getIfPresent(key);
		if (value != null) {
			log.debug("get cache from caffeine, the key is : {}", cacheKey);
			return value;
		}

  // 2. 调用 redis 查询在指定的值
		value = stringKeyRedisTemplate.opsForValue().get(cacheKey);

		if (value != null) {
			log.debug("get cache from redis and put in caffeine, the key is : {}", cacheKey);
			caffeineCache.put(key, value);
		}
		return value;
	}
}

public class RedisCaffeineCache extends AbstractValueAdaptingCache {
	@Override
	public void put(Object key, Object value) {
		push(new CacheMessage(this.name, key));
	}

	@Override
	public ValueWrapper putIfAbsent(Object key, Object value) {
				push(new CacheMessage(this.name, key));
	}

	@Override
	public void evict(Object key) {
		push(new CacheMessage(this.name, key));
	}

	@Override
	public void clear() {
		push(new CacheMessage(this.name, null));
	}

	private void push(CacheMessage message) {
		stringKeyRedisTemplate.convertAndSend(topic, message);
	}
}

public class CacheMessageListener implements MessageListener {

	private final RedisTemplate<Object, Object> redisTemplate;

	private final RedisCaffeineCacheManager redisCaffeineCacheManager;

	@Override
	public void onMessage(Message message, byte[] pattern) {
		CacheMessage cacheMessage = (CacheMessage) redisTemplate.getValueSerializer().deserialize(message.getBody());
				cacheMessage.getCacheName(), cacheMessage.getKey());
		redisCaffeineCacheManager.clearLocal(cacheMessage.getCacheName(), cacheMessage.getKey());
	}
}