Message Translator Generator

[GenerateMessageTranslator] creates a factory for MessageTranslator<TInput,TOutput>.

Use it when partner or transport event normalization is part of the application contract and should be validated by the compiler.

using PatternKit.Generators.Messaging;
using PatternKit.Messaging;

[GenerateMessageTranslator(typeof(PartnerOrderAccepted), typeof(CommerceOrderAccepted), FactoryName = "Build")]
[MessageTranslatorDropHeader("raw-signature")]
[MessageTranslatorHeader(MessageHeaderNames.ContentType, "application/vnd.myapp.order+json")]
public static partial class PartnerOrderTranslator
{
    [MessageTranslatorHandler]
    private static CommerceOrderAccepted Translate(Message<PartnerOrderAccepted> message, MessageContext context)
        => new($"commerce-{message.Payload.ExternalOrderId}", message.Payload.Amount, message.Payload.PartnerId);
}

Generated output:

var translator = PartnerOrderTranslator.Build();
var result = translator.Translate(partnerMessage);

Diagnostics

• PKMT001: the translator host must be partial.
• PKMT002: exactly one [MessageTranslatorHandler] method is required.
• PKMT003: the handler must be static, return the output payload type, and accept Message<TInput> plus MessageContext.

Example

• src/PatternKit.Examples/Messaging/PartnerEventTranslatorExample.cs
• test/PatternKit.Examples.Tests/Messaging/PartnerEventTranslatorExampleTests.cs