@Override
public FeatureState getFeatureState(Feature feature) {
// first try to find it from the cache
CacheEntry entry = cache.get(feature);
if (entry != null && !isExpired(entry)) {
return entry.getState() != null ? entry.getState().copy() : null;
}
// no cache hit
FeatureState featureState = delegate.getFeatureState(feature);
// cache the result (may be null)
cache.put(feature, new CacheEntry(featureState != null ? featureState.copy() : null));
// return the result
return featureState;
}
@Override
public void setFeatureState(FeatureState featureState) {
delegate.setFeatureState(featureState);
cache.remove(featureState.getFeature());
}