@SuppressWarnings("unchecked")
@Override
protected <T> Invoker<T> doSelect(List<Invoker<T>> invokers, URL url, Invocation invocation) {
    String methodName = RpcUtils.getMethodName(invocation);
    String key = invokers.get(0).getUrl().getServiceKey() + "." + methodName;
    int invokersHashCode = invokers.hashCode();

    // If the detection is successful, return in advance. it may be different from selector, but it doesn't matter
    ConsistentHashSelector<T> oldSelector0;
        if((oldSelector0 = (ConsistentHashSelector<T>) selectors.get(key)) != null && oldSelector0.identityHashCode == invokersHashCode){
            return oldSelector0.select(invocation);
        }

    // using the hashcode of invoker list to create consistent selector by atomic computation.
    ConsistentHashSelector<T> selector = (ConsistentHashSelector<T>) selectors.compute(
            key,
            (k, oldSelector) -> (oldSelector == null || oldSelector.identityHashCode != invokersHashCode)
                    ? new ConsistentHashSelector<>(invokers, methodName, invokersHashCode)
                    : oldSelector);
    return selector.select(invocation);
}