EventCatalog | Services

Overview

The Cart API is the front door to the Cart System. It validates incoming commands, persists cart contents to the Cart DatabaseCart DatabaseContainerv1.0.0PostgreSQL database that is the system of record for shopping carts and their items.MapView docs, asks the Promotion SystemPromotion SystemSystemv1.0.0Internal system that calculates the discounts and promotions that apply to a cart. It owns promotion rules and returns c...Ownershopping-platformMapView docs to calculate discounts via Calculate DiscountCalculate DiscountCommandv1.0.0Command to calculate the discount that applies to a cart. Ownershopping-platformSchema MapView docs, and publishes a Cart Checked OutCart Checked OutEventv1.0.0Published when a customer has checked out their cart. Ownershopping-platformSchema MapView docs event when the customer checks out.

Sends 2 messages

Checkout event and discount requests

Receives 3 messages

Cart commands handled by this service

Responsibilities

Area	Description
Cart management	Validates and applies Add Item To CartAdd Item To CartCommandv1.0.0Command to add an item to a shopping cart. Ownershopping-platformSchema MapView docs, Remove Item From CartRemove Item From CartCommandv1.0.0Command to remove an item from a shopping cart. Ownershopping-platformSchema MapView docs and Checkout CartCheckout CartCommandv1.0.0Command to check out a shopping cart. Ownershopping-platformSchema MapView docs.
Discounts	Requests pricing from the Promotion System via Calculate DiscountCalculate DiscountCommandv1.0.0Command to calculate the discount that applies to a cart. Ownershopping-platformSchema MapView docs.
Event publishing	Emits Cart Checked OutCart Checked OutEventv1.0.0Published when a customer has checked out their cart. Ownershopping-platformSchema MapView docs when a cart is checked out.
Persistence	Reads from and writes to the Cart DatabaseCart DatabaseContainerv1.0.0PostgreSQL database that is the system of record for shopping carts and their items.MapView docs (system of record).

Architecture diagram

Messages for this service

Sends messages (2)

Quickly find the message you need by searching for the name, type, or summary.

Name	Version	Type	Summary
Cart Checked Out	v1.0.0	event	Published when a customer has checked out their cart.
Calculate Discount	v1.0.0	command	Command to calculate the discount that applies to a cart.

Receives messages (3)

Quickly find the message you need by searching for the name, type, or summary.

Name	Version	Type	Summary
Add Item To Cart	v1.0.0	command	Command to add an item to a shopping cart.
Remove Item From Cart	v1.0.0	command	Command to remove an item from a shopping cart.
Checkout Cart	v1.0.0	command	Command to check out a shopping cart.

Event-driven architecture documentation: Acme Inc

Cart API

The public-facing API for shopping carts. Handles commands to add and remove items and to check out, and publishes an event when a cart is checked out.