protected override Task <AddressModel> SelectAsync(AddressSelectorContext context)
{
var address = context.Address.ToArray();
var length = address.Length;
var index = _generate(0, length);
return(Task.FromResult(address[index]));
}
protected override async Task <AddressModel> SelectAsync(AddressSelectorContext context)
{
var key = GetCacheKey(context.Descriptor);
var entry = _concurrent.GetOrAdd(key,
k => new Lazy <AddressEntry>(() => new AddressEntry(context.Address))).Value;
AddressModel address;
do
{
address = entry.GetAddress();
} while (await _healthCheckService.IsHealth(address) == false);
return(address);
}
/// <summary>
/// 选择一个地址。
/// </summary>
/// <param name="context">地址选择上下文。</param>
/// <returns>地址模型。</returns>
ValueTask <AddressModel> IAddressSelector.SelectAsync(AddressSelectorContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Descriptor == null)
{
throw new ArgumentNullException(nameof(context.Descriptor));
}
if (context.Address == null)
{
throw new ArgumentNullException(nameof(context.Address));
}
var address = context.Address.ToArray();
if (!address.Any())
{
throw new ArgumentException("没有任何地址信息。", nameof(context.Address));
}
return(context.Address.Count() == 1 ? new ValueTask <AddressModel>(context.Address.First()) : new ValueTask <AddressModel>(SelectAsync(context)));
}
/// <summary> /// 选择一个地址。 /// </summary> /// <param name="context">地址选择上下文。</param> /// <returns>地址模型。</returns> protected abstract Task <AddressModel> SelectAsync(AddressSelectorContext context);
