my1795 / Order_Payment_Stock_Saga_Pattern

Saga pattern with Java => order -> payment -> stock microservices are ready to use

Order_Payment_Stock_Saga_Pattern

Saga pattern with Java => order -> payment -> stock microservices are ready to use

Docker-compose.yaml

You can see that rabbitmq is necessary for message broker.

Choreography saga is used for implementation.

How to run

git clone [e-mail]:grkn/Order_Payment_Stock_Saga_Pattern.git Open IDE from your computer Import Project Run Application.java for each services (I didn't write startup script)

There is only one endpoint for creating order.

POST http://localhost:8089/saga/v1/order
body : [
    {
        "name" : "order1",
        "quantity": 2
    },
    {
        "name" : "order2",
        "quantity": 2
    },
    {
        "name" : "order3",
        "quantity": 1
    }
]

GET http://localhost:8089/saga/v1/order/transaction/{transactionId}
Response : 
    
    {
        "transactionId": "d7c4d073-061d-4f04-8ff6-d1d0de4e1976",
        "name": "order1",
        "quantity": 4,
        "status": "ORDER_FAILED",
        "paymentId": "7260a2ac-233f-441a-aa74-51a9e331afbb"
    }

GET http://localhost:8088/saga/v1/payment/{paymentId}
Response :
    {
        "status": "PAYMENT_COMPLETED",
        "totalPrice": 531.0,
        "transactionId": "506cc494-3594-46a4-8f52-780f7668513d"
    }

Of course there are some failure cases

Buy operation is dump and sometime gives error.

Also stock is limited maybe you can not buy necessary amount.

There are static order names : order1, order2, order3, order4, order5. Other names will give an error

Database are h2 database and each database has one table. You can easily check status from database.

Also I have added stock info endpoint for all stocks.

GET http://localhost:8087/saga/v1/stock

Response: [
    {
        "name": "order1",
        "quantity": 8
    },
    {
        "name": "order2",
        "quantity": 12
    },
    {
        "name": "order3",
        "quantity": 8
    },
    {
        "name": "order4",
        "quantity": 12
    },
    {
        "name": "order5",
        "quantity": 0
    }
]

I have added postman collection it is not auto configured so you can simply change it according to your needs.

Additional Information :

User sends order request to ORDER service.

ORDER service sends 2 amqp message to PAYMENT service and STOCK service

STOCK service sends related amqp message to ORDER service and PAYMENT service

PAYMENT service sends success or fail to ORDER service.

Statuses that are related with Order, Payment, Stock

• Also you can send multiple order. When one them fails it automatically fails all the orders so be aware of this behaviour. You can modify stock's listener code for desired behaviour

ORDER_RECEIVED, ORDER_COMPLETED, ORDER_PENDING, ORDER_FAILED, ORDER_STOCK_COMPLETED

PAYMENT_REQUESTED, PAYMENT_PENDING, PAYMENT_COMPLETED, PAYMENT_FAILED, PAYMENT_AVAILABLE

STOCK_REQUESTED, STOCK_COMPLETED, STOCK_FAILED, STOCK_PENDING

Each service listens the related queue.

Exchange -> sagaExchange

Order service -> orderQueue -> orderDto is payload Payment service -> paymentQueue -> paymentDto is payload Stock service -> stockQueue -> stockDto is payload