caffeine_redis自定义二级缓存

目录

• 背景
• 问题
• 流程图
• 开发
• CacheConfig
• @CaffeineCache
• CacheMessageListener
• CaffeineCacheAspect
• CacheMessage
• 总结

@Bean(name = JKDDCX)
@Primary
public CacheManager cacheManager() {
     CaffeineCacheManager cacheManager  = new CaffeineCacheManager();
        cacheManager.setCaffeine(Caffeine.newBuilder()
                // 设置最后一次写入或访问后经过固定时间过期
                .expireAfterAccess(EXPIRE, TIME_UNIT)
                //设置本地缓存写入后过期时间
                .expireAfterWrite(EXPIRE, TIME_UNIT)
                // 初始的缓存空间大小
                .initialCapacity(500)
                // 缓存的最大条数
                .maximumSize(1000));// 使用人数 * 5 （每个人不同的入参 5 条）\
  return cacheManager;
}

@Target({ ElementType.METHOD ,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CaffeineCache {

     public String moudleId() default "";
    
     //用于在数据库中配置参数
     public String methodId() default "";
     public String cachaName() default "";
    
     //动态切换实际的 CacheManager
     public String cacheManager() default "";

}

public class CacheMessageListener implements MessageListener {
     @Override
    public void onMessage(Message message, byte[] pattern) {
        CacheMessage cacheMessage = (CacheMessage) redisTemplate.getValueSerializer().deserialize(message.getBody());
        logger.info("收到redis清除缓存消息, 开始清除本地缓存, the cacheName is {}, the key is {}", cacheMessage.getCacheName(), cacheMessage.getKey());
//		redisCaffeineCacheManager.clearLocal(cacheMessage.getCacheName(), cacheMessage.getKey());

        /**
         * 如果是一个类上使用了 注解 @CaffeineCache ，那么所有接口都会缓存。
         * 下面的逻辑是：除了当前模块的接口访问的入参 key，其他的 redis 缓存都会被清除
         * （比如此模块的表更新了，但是当前调用此接口只是缓存了当前这个入参的redis,其他的数据删除）
         */
        String prefixKey = RedisConstant.WXYMG_DATA_CACHE + cacheMessage.getCacheName();
        Set<String> keys = redisTemplate.execute((RedisCallback<Set<String>>) connection -> {
            Set<String> keysTmp = new HashSet<>();
            Cursor<byte[]> cursor = connection.scan(new ScanOptions.ScanOptionsBuilder().
                    match(prefixKey + "*").
                    count(50).build());
            while (cursor.hasNext()) {
                keysTmp.add(new String(cursor.next()));
            }
            return keysTmp;
        });
        Iterator iterator = keys.iterator();
        while (iterator.hasNext()) {
            if (iterator.next().toString().equals(cacheMessage.getKey())) {
                iterator.remove();
            }
        }
        redisTemplate.delete(keys);

        cacheConfig.cacheManager().getCache(cacheMessage.getCacheName()).clear(); //cacheName 下的都删除
    }
}

redisTemplate.convertAndSend(CacheConfig.TOPIC, new CacheMessage(caffeineCache.cachaName(), redisKey));

public class CacheMessage implements Serializable {

	private static final long serialVersionUID = -1L;

	private String cacheName;

	private Object key;

	public CacheMessage(String cacheName, Object key) {
		super();
		this.cacheName = cacheName;
		this.key = key;
	}

}