/// <summary>
/// Adds a <see cref="DelegatingHandler"/> that performs round robin load balancing, optionally backed by an <see cref="IDistributedCache"/>
/// </summary>
/// <param name="httpClientBuilder">The <see cref="IHttpClientBuilder"/>.</param>
/// <remarks>
/// Requires an <see cref="IServiceInstanceProvider" /> or <see cref="IDiscoveryClient"/> in the DI container so the load balancer can sent traffic to more than one address<para />
/// Also requires an <see cref="IDistributedCache"/> in the DI Container for consistent round robin balancing across multiple client instances
/// </remarks>
/// <returns>An <see cref="IHttpClientBuilder"/> that can be used to configure the client.</returns>
public static IHttpClientBuilder AddRoundRobinLoadBalancer(this IHttpClientBuilder httpClientBuilder)
{
if (httpClientBuilder == null)
{
throw new ArgumentNullException(nameof(httpClientBuilder));
}
httpClientBuilder.Services.TryAddSingleton(typeof(RoundRobinLoadBalancer));
return(httpClientBuilder.AddLoadBalancer <RoundRobinLoadBalancer>());
}
