Checkout Backpressure

The checkout backpressure example shows a production-style admission gate in front of checkout work. It includes a fluent policy, a source-generated policy factory, and an IServiceCollection extension that registers the policy and workflow service.

Import it into a host:

services.AddCheckoutBackpressureDemo();

For reusable app-level registration without importing examples:

services.AddPatternKitBackpressurePolicy<CheckoutAdmission>(
    "checkout-backpressure",
    builder => builder
        .WithCapacity(8)
        .WithMode(BackpressureMode.Wait)
        .WithWaitTimeout(TimeSpan.FromMilliseconds(50)));