}
private MultiWindowRate getMultiWindowRate(
String key, ConcurrentMap<String, MultiWindowRate> map
) {
MultiWindowRate rate = map.get(key);
if (rate == null) {
rate = new MultiWindowRate();
MultiWindowRate existingRate = map.putIfAbsent(key, rate);
if (existingRate != null) {
rate = existingRate;
}
}