Generated Dead Letter Channel

The generated dead-letter channel example models a checkout fulfillment boundary where failed warehouse or carrier messages are captured with reason, attempt count, original headers, and replay metadata.

Production applications can import the example through IServiceCollection:

var services = new ServiceCollection();
services.AddFulfillmentDeadLetterChannelExample();

using var provider = services.BuildServiceProvider();
var workflow = provider.GetRequiredService<FulfillmentDeadLetterWorkflow>();

var summary = workflow.Capture(
    FulfillmentDeadLetterChannelExample.CreateCommand("order-100"),
    "carrier timeout");

The example includes:

• a fluent DeadLetterChannel<FulfillmentCommand> path
• a source-generated [GenerateDeadLetterChannel] path
• an importable FulfillmentDeadLetterWorkflow
• TinyBDD tests for fluent, generated, and DI usage

Files:

• src/PatternKit.Examples/Messaging/FulfillmentDeadLetterChannelExample.cs
• test/PatternKit.Examples.Tests/Messaging/FulfillmentDeadLetterChannelExampleTests.cs