Overview

The DeleteBasketCompleteCommand is an integration event published by the Finance service when a basket is successfully deleted during the order processing workflow. This command is part of the normal success flow in the order processing saga and is used to notify other services about the successful basket cleanup, allowing them to proceed with subsequent steps in the order fulfillment process.

Architecture

Message Structure

The command contains the following properties:

Workflow Context

This command is published by the Order State Machine when the following conditions are met:

1. The order is in the Placed state
2. A BasketDeletedCompleteIntegrationEvent is received, indicating successful basket deletion
3. The command is published to notify downstream services about the successful operation

Technical Implementation

The DeleteBasketCompleteCommand is implemented as follows:

[AsyncApi]
[Channel("basket-checkout-complete")]
[SubscribeOperation(
    typeof(DeleteBasketCompleteCommand),
    OperationId = nameof(DeleteBasketCompleteCommand),
    Summary = "Delete basket complete"
)]
public sealed record DeleteBasketCompleteCommand(Guid OrderId, decimal TotalMoney)
    : IntegrationEvent;

Within the Order State Machine, the command is published when a basket deletion is confirmed:

When(BasketDeleted)
    .Then(context =>
    {
        context.Saga.BasketId = context.Message.BasketId;
        context.Saga.OrderId = context.Message.OrderId;
        context.Saga.TotalMoney = context.Message.TotalMoney;

        logger.LogInformation(
            "[{Event}] Basket deleted for {OrderId}",
            nameof(BasketDeleted),
            context.Message.OrderId
        );
    })
    .Publish(context => new DeleteBasketCompleteCommand(
        context.Saga.OrderId,
        context.Saga.TotalMoney.GetValueOrDefault(0.0M)
    ))

Success Flow

This command plays an important role in the successful order processing flow:

1. When a basket is successfully deleted, the BasketDeletedCompleteIntegrationEvent is received
2. The state machine processes this event and publishes the DeleteBasketCompleteCommand
3. This command signals to downstream services that the basket has been successfully cleaned up
4. The order processing can continue to the next steps

Consuming Services

This command is typically consumed by:

• Ordering Service: To update the order status and store in event store
• Notification Service: To send order confirmation to the customer