Caffeine
       .newBuilder()
       .maximumSize(500)
       .refreshAfterWrite(CACHE_REFRESH_TIME_IN_SECONDS, TimeUnit.SECONDS)
       .recordStats(() -> new CaffeineStatsCounter(counter, gauge, "header"))
       .expireAfter(new ExpirableCacheEntryExpiry<ExperimentSetCacheKey, ExperimentSetResponse>())
       .build(new MemcacheCacheLoader<ExperimentSetCacheKey, ExperimentSetResponse>(memcachedClient, "search") {
        	@Override
        	public Optional<ExperimentSetResponse> fetchFromSource(ExperimentSetCacheKey key) {
        		return getExperimentSetByContentIdFromSource(
        				key.getId(), 
        				key.getToken(), 
        				key.getNumberOfItems());
        	}

        	@Override
        	public String getCacheKey(final ExperimentSetCacheKey key) {
        		return String.format("%s-key", key.getSwid());
        	}

        	@Override
        	public int getCacheExpirationInSeconds(Optional<ExperimentSetResponse> source) {
        		return CACHE_EXPIRATION_TIME_IN_SECONDS;
        	}

        	@Override
        	public int getCacheRefreshEligibleInSeconds(Optional<ExperimentSetResponse> source) {
        		return CACHE_REFRESH_TIME_IN_SECONDS;
        	}
        });```