/// <summary>
/// Get a configured policy used for HttpClients
/// </summary>
/// <returns></returns>
private static IAsyncPolicy <HttpResponseMessage> GetRetryPolicy(TvMazeConfig config)
{
// Using a Jitterer can improve the overall performance of the end-to-end system by adding randomness to the exponential backoff.
// This spreads out the spikes when issues arise
var jitterer = new Random();
var jitterValue = config.UseJitterer ? TimeSpan.FromMilliseconds(jitterer.Next(0, 100)) : new TimeSpan(0);
return(HttpPolicyExtensions
.HandleTransientHttpError()
.OrResult(msg => msg.StatusCode == System.Net.HttpStatusCode.NotFound)
.WaitAndRetryAsync(config.RetryCount, // exponential back-off plus some jitter
retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)) + jitterValue));
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext <DatabaseContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
var config = new TvMazeConfig();
Configuration.GetSection("TvMaze").Bind(config);
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddHttpClient <ITvMazeWebService, TvMazeWebService>(client => client.BaseAddress = new Uri(config.BaseUrl))
.SetHandlerLifetime(TimeSpan.FromMinutes(config.HttpMessageHandlerLifeTime))
.AddPolicyHandler(GetRetryPolicy(config));
services.AddTransient <IShowService, ShowService>();
}
