This architecture consists of three microservices:
order-service: Generates an order and publishes a message to the "orders" topic in Kafka.
stock-service: Listens to the "orders" topic, checks the availability of the products specified in the Order, and publishes the result to "stock" topic.
payment-service: Listens to the "stock" topic and simulates the approval of the order. \
Take a look at out architecture diagram:
The order-service creates a new Order with OrderStatus.PENDING and publishes it to the "orders" Kafka topic.
The stock-service consumes the Order message, deserializes it, checks product availability, and, if the products are available, publishes the result to the "stock" Kafka topic.
The payment-service consumes the message from the "stock" topic, simulates the payment process, and updates the OrderStatus to PAID.
Access the endpoint by entering the number of orders you want to generate.
orders-service: 8087
stock-service: 8088
payment-service: 8089
orders-service needs to be running
{host}/orders/generate?quantity=10000
this way you generate thousands of different orders.
Go to the root directory and run in terminal:
$ docker compose up -d
Wait for docker download all images
Then go to the root directory of each microservice on separate terminals and run:
$ mvn clean spring-boot:run
And that's it! you've started Zookeeper, Kafka, MongoDB, and KafkaUI.
To access Kafka UI, use port 8080.