How to automatically refresh Cache using Google Guava?

user_755932 0
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I am using Google Guava library for caching. For automatic cache refresh we can do as follows:

cache = CacheBuilder.newBuilder()               
                    .refreshAfterWrite(15, TimeUnit.MINUTES)
                    .maximumSize(100)
                    .build(....);

However, automatic refreshes are performed when the first stale request for an entry occurs.

Is there a way to refresh it automatically even though no requests came for cache data? Like for every 15 minutes the cache data should be pulled from Db and load it, no matter whether anybody called cache data or not.

Also, Guava's cache expiry time is for entire cache. Is it possible to expire cache values based on key? Like cache data with key "NOT_SO_FREQ_CHANGE_DATA" to expire for every 1 hour and data with key "FREQ_CHANGING_DATA" should expire for every 15 minutes?

guava caching java
4 Answers

Can you reload the cache value automatically using the below code snippet, without calling the refresh method ??

cacher =
        CacheBuilder.newBuilder()
            .refreshAfterWrite(10, TimeUnit.SECONDS)
          .build(CacheLoader.asyncReloading(new CacheLoader<String, String>() {

              @Override
              public String load(String key) throws Exception {
                return method-call();
              }
            }, Executors.newSingleThreadExecutor()));
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