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I have a requirement to rebuild the cache which is already declared and configured based on a condition.

private static final Cache<String, List<String>> CACHE = CacheBuilder.newBuilder().expireAfterWrite(30, TimeUnit.MINUTES).build();

Here I have already created the cache for 30 minutes. now let's say the user has a configuration to override the expiration time. So I need to rebuild the cache based on the configuration time.

Also is there any way to get cache last access time?

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  • What exactly do you mean by rebuild the cache? Start a new empty cache? Guava's Cache doesn't provide access to when it was last accessed or let you change the expiration time after the cache is built; you must create the cache with the correct expiration time the first time. It doesn't look like your cache should be a static final. Commented May 21, 2024 at 8:09
  • Rebuilding the cache means, cache should use the new configuration rather than the default 30 mins. @LouisWasserman Commented May 21, 2024 at 8:19
  • You can't do that. Commented May 21, 2024 at 8:30
  • fwiw, the successor library, Caffeine, allows you to adjust the configuration for enabled features at runtime. This also allows for inspecting other metadata, like expiration order. Commented May 22, 2024 at 6:56
  • Can we do like per key with expiring time and evict the key value based on the time? rather than the global expiry time. Commented May 22, 2024 at 9:28
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