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Redis Size Limit per individual cache

Redis can be used as a cache storage engine within Spring(boot) applications. However, it only allows to set an overall maxmemory size limit. Is there a way to restrict individual RedisCaches in their size, either by number of elements or number of bytes stored in that (sub-)cache?

Is there any wrapper-library that provides such functionality? Or is there perhaps an interface one could implement to easily achieve something like this?

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2

Answers


  1. 0

    You should write your own redis jar maintaining these restrictions and provide an interface to your main project. This will give you much more flexibility

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  2. 0

    Yes, you can achieve the same. I would suggest you use the Redisson client for this purpose.

    @Configuration
@EnableCaching
public static class Application {

    @Bean(destroyMethod="shutdown")
    RedissonClient redisson() throws IOException {
        Config config = new Config();
        config.useClusterServers()
              .addNodeAddress("redis://127.0.0.1:7004", "redis://127.0.0.1:7001");
        return Redisson.create(config);
    }

    @Bean
    public CacheManager cacheManager(RedissonClient redissonClient) {
        Map<String, CacheConfig> config = new HashMap<String, CacheConfig>();

        // create "testMap" cache with ttl = 24 minutes and maxIdleTime = 12 minutes
        CacheConfig cacheConfig = new CacheConfig(24*60*1000, 12*60*1000);
        // 100 entries 
        cacheConfig.setMaxSize(100);
        config.put("testMap", cacheConfig);
 
        return new RedissonSpringCacheManager(redissonClient, config);
    }

}
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