vigo92/bookstore

About BookStore application

BookStore

BookStore is an online shopping application selling books.

Goal

The main goal of building this application is to learn various technologies by building a reasonably complex application.

Technical Architecture

The key components of BookStore application are:

• bookstore-webapp: This is the customer facing web application where they can browse through available books, add books to cart and place an order.
• bookstore-backoffice: This is a backoffice web application used by administrators and staff to setup the books catalog and manage orders.
• backing-services: These are domain-oriented backend services that fulfill the needs for bookstore-webapp and bookstore-backoffice.

We would like to build the backing-services as independently deployable microservices so that each service can be developed in the preferred language/framework. Most of these backing-services will expose REST APIs to be consumed by webapp, backoffice and also by other APIs. Some backing-services could be only event processors where they consume events from an event store(Kafka, RabbitMQ etc), process them and optionally publish other events.

The web applications bookstore-webapp, bookstore-backoffice could be implemented using SPA frameworks like Angular, VueJS, ReactJS etc or using server-side rendering technologies like Thymeleaf.

Typical application flow

A typical application usage flow looks like:

• Customer browse through product catalog
• Add preferred products to cart
• Go to checkout page
• Enter customer details, delivery address, payment details.
• Place order
  • Validate order details
  • Validate Payment details
  • If payment details is valid then set status to "NEW" otherwise to "ERROR"
  • Save order details in DB
  • Publish OrderCreated Event
  • If payment details is invalid then Publish OrderError Event
• Order Processing
  • Notification-service receives OrderCreated Event and send an email notification to customer
  • Notification-service receives OrderError Event and send an email notification to customer
  • Delivery-service receives OrderCreated Event and save order with status READY_TO_SHIP
  • Delivery-service DeliveryJob update local status from READY_TO_SHIP to DELIVERED and then publish OrderDelivered Event
  • Order-service receives OrderDelivered Event and update status to DELIVERED
  • Notification-service receives OrderDelivered Event and send an email notification to customer
• Customer receives order update emails with a link to view current order details.

Backend Services

1. catalog-service

This service manages the books catalog and exposes the following REST API endpoints:

• Get books by page
• Get book by code(ISBN)
• Create new Book
• Update existing book
• Delete a book
• Search books by title or description

While serving product information this service calls promotion-services and include discount if exists.

For more info see Catalog Service Docs

2. promotion-service

This service manages promotions(discounts) for books and exposes the following REST API endpoints:

• Get promotions for a given set of codes(ISBNs)
• Get promotion for a given code(ISBN)
• Create promotion for a given book
• Update promotion for a given book
• Delete promotion for a given book

For more info see Promotion Service Docs

3. payment-service

This services exposes API to validate payment info (credit card number, cvv, expiry month/year)

For more info see Payment Service Docs

4. cart-service

This service manages customer carts and exposes the following REST API endpoints:

• Create a new cart.
• Add item to cart
• Update quantity of an item in a cart
• Remove item from a cart
• Delete a cart

For more info see Cart Service Docs

5. order-service

This service manages customer orders and exposes the following REST API endpoints:

• Create an order. After successfully saving order info publish ORDER_CREATED event.
• Cancel order. After cancelling order publish ORDER_CANCELLED event.
• Get all orders
• Get order by order_number

Event Handlers:

• ORDER_DELIVERED event handler: Update order status to DELIVERED
• ORDER_CANCELLED event handler: Update order status to CANCELLED
• ORDER_ERROR event handler: Update order status to ERROR

For more info see Order Service Docs

6. delivery-service

This service manages order delivery process.

Event Handlers:

• ORDER_CREATED event handler: save order with status READY_TO_SHIP

Jobs:

• OrderDeliveryJob:
  • Process orders with status=READY_TO_SHIP, deliver the order and publish ORDER_DELIVERED event.
  • In case of any failures publish ORDER_ERROR event.

For more info see Delivery Service Docs

7. notification-service

This service send email notifications on various order events.

Event Handlers:

• ORDER_CREATED event handler: Send order received email notification
• ORDER_CANCELLED event handler: Send order cancelled email notification
• ORDER_DELIVERED event handler: Send order delivered email notification
• ORDER_ERROR event handler: Send order can't be fulfilled email notification

For more info see Notification Service Docs

How to contribute?

• Run the application and let us know if you face any issue
• Review the code and add your review comments
• Contribute implementation of a service in your favourite language/framework