Transaction Script Generator

GenerateTransactionScriptAttribute creates a typed TransactionScript<TRequest,TResponse> factory from a static partial host.

[GenerateTransactionScript(typeof(SubmitOrderRequest), typeof(SubmitOrderReceipt), FactoryName = "CreateScript", ScriptName = "submit-order")]
public static partial class GeneratedSubmitOrderScript
{
    [TransactionScriptValidator]
    private static IEnumerable<TransactionScriptError> Validate(SubmitOrderRequest request)
        => request.Total <= 0m
            ? [new TransactionScriptError("total", "Order total must be positive.")]
            : [];

    [TransactionScriptHandler]
    private static ValueTask<SubmitOrderReceipt> Handle(SubmitOrderRequest request, CancellationToken cancellationToken)
        => new(new SubmitOrderReceipt(request.OrderId, request.Total));
}

The generated factory is equivalent to:

TransactionScript<SubmitOrderRequest, SubmitOrderReceipt>
    .Create("submit-order")
    .Validate(Validate)
    .Execute(Handle)
    .Build();

Diagnostics:

• PKTS001: host type must be partial.
• PKTS002: exactly one [TransactionScriptHandler] method is required.
• PKTS003: handler must be static and return ValueTask<TResponse> from (TRequest, CancellationToken).
• PKTS004: validator must be a single static method returning IEnumerable<TransactionScriptError> from TRequest.