如果我使用 cacheBuilder，如何为具体缓存自定义 expireAfterWrite？

问题描述

基于 this answer，我尝试将自定义 expireAfterWrite 用于“customCache”

所以我的配置是这样的：

@Configuration
@EnableCaching
public class caffeineCacheConfig {

    ...

    @Bean
    public caffeineCacheManager cacheManager(caffeine<Object,Object> caffeineCacheBuilder) {
        caffeineCacheManager result = new caffeineCacheManager();
        result.setcaffeine(caffeineCacheBuilder);
        return result;
    }

    @Bean
    public caffeine<Object,Object> caffeineCacheBuilder() {
        return caffeine.newBuilder()
                .maximumSize(10000)
                .expireAfterWrite(60,TimeUnit.SECONDS)
                .recordStats();
    }

    @Bean
    public caffeineCache customCache() {
        return new caffeineCache("customCache",caffeine.newBuilder()
                        .maximumSize(10000)
                        .expireAfterWrite(60,TimeUnit.MINUTES)
                        .recordStats()
                        .build());
    }
}

然后在代码库中我使用：

“自定义缓存”

Cache cache = cacheManager.getCache("customCache")
String result = cache.get("myKey",() -> "cachedValue")

并且根据我的实验，它在缓存 pn 上保持值仅 60 秒，而我预计 60 分钟。

如何达到预期的效果？

解决方法

我认为更好的方法如下。

@Configuration
@EnableCaching
public class CaffeineCacheConfig
{
    @Bean
    public CacheManager cacheManager(
            @Qualifier("oneMinuteCache") final Cache<Object,Object> oneMinuteCache,@Qualifier("oneHourCache") final Cache<Object,Object> oneHourCache)
    {
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        cacheManager.setCaches(Arrays.asList(
                new CaffeineCache("oneMinuteCache",oneMinuteCache),new CaffeineCache("oneHourCache",oneHourCache)));
        return cacheManager;
    }

    @Bean
    public Cache<Object,Object> oneMinuteCache()
    {
        return Caffeine.newBuilder()
                .maximumSize(10000)
                .expireAfterWrite(1,TimeUnit.MINUTES)
                .recordStats()
                .build();
    }

    @Bean
    public Cache<Object,Object> oneHourCache()
    {
        return Caffeine.newBuilder()
                .maximumSize(10000)
                .expireAfterWrite(1,TimeUnit.HOURS)
                .recordStats()
                .build();
    }
}