Guava cache with per key expiry
jijesh vu
Jonathan Bluett-Duncan
Is there any option for guava cache to behave like each key with expiry time. When the key reached its age can be removed and fetch new values from api ?
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jijesh vu
public class PerKeyExpirationCache<k, v>
{
private final Cache<k, v> cache;
private final Map<k, Long> expirationTimes;
public PerKeyExpirationCache()
{
this.cache = CacheBuilder.newBuilder().build();
this.expirationTimes = new ConcurrentHashMap<>();
}
public void put(k key, v value, long duration, TimeUnit unit)
{
cache.put(key, value);
expirationTimes.put(key, System.nanoTime() + unit.toNanos(duration));
}
public v get(k key) throws ExecutionException
{
if (isExpired(key)) {
cache.invalidate(key);
expirationTimes.remove(key);
}
return cache.getIfPresent(key);
}
private boolean isExpired(k key)
{
return expirationTimes.containsKey(key) && System.nanoTime() > expirationTimes.get(key);
}
public void invalidate(k key)
{
cache.invalidate(key);
expirationTimes.remove(key);
}
}