/// <summary>
 /// Adds an event handler to the subscription, adding the specified retry policy
 /// </summary>
 /// <param name="builder">Subscription builder</param>
 /// <param name="retryPolicy">Polly retry policy</param>
 /// <typeparam name="THandler">Event handler type</typeparam>
 /// <returns></returns>
 public static SubscriptionBuilder AddEventHandlerWithRetries <THandler>(
     this SubscriptionBuilder builder,
     IAsyncPolicy retryPolicy
     ) where THandler : class, IEventHandler
 => builder.AddCompositionEventHandler <THandler, PollyEventHandler>(
     h => new PollyEventHandler(h, retryPolicy)
     );
 /// <summary>
 /// Adds an event handler to the subscription, adding the specified retry policy
 /// </summary>
 /// <param name="builder">Subscription builder</param>
 /// <param name="getHandler">Function to construct the handler</param>
 /// <param name="retryPolicy">Polly retry policy</param>
 /// <typeparam name="THandler">Event handler type</typeparam>
 /// <returns></returns>
 public static SubscriptionBuilder AddEventHandlerWithRetries <THandler>(
     this SubscriptionBuilder builder,
     Func <IServiceProvider, THandler> getHandler,
     IAsyncPolicy retryPolicy
     ) where THandler : class, IEventHandler
 => builder.AddCompositionEventHandler(
     getHandler,
     h => new PollyEventHandler(h, retryPolicy)
     );