Google_Cache_Builder.java

   public static Cache<Integer, List<CountryPublicHolidays>> countryPublicHolidaysCache;

    static {
        countryPublicHolidaysCache = CacheBuilder.newBuilder()
                .maximumSize(1000)
                .expireAfterWrite(20, TimeUnit.MINUTES)
                .build();
    }
    
    var cachedCountryPublicHolidays = countryPublicHolidaysCache.getIfPresent(currentYear);
    
    countryPublicHolidaysCache.put(currentYear, Optional.ofNullable(countryPublicHolidays).orElse(Collections.emptyList()));
    return countryPublicHolidaysCache.getIfPresent(currentYear);