📬 Notification Service

A Spring Boot-based microservice for sending and retrieving user notifications.
Built with RabbitMQ integration for message queuing and asynchronous processing.
Provides RESTful GET and POST endpoints to interact via tools like Postman.

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🚀 Features

• Send notifications via POST request
• Retrieve notifications by user ID
• Queue integration using RabbitMQ
• Dockerized setup for easy local development

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🐳 Running the Project with Docker

1. Start RabbitMQ using Docker

docker run -d --hostname rabbit-host --name rabbitmq \
  -p 5672:5672 -p 15672:15672 rabbitmq:3-management

RabbitMQ Management UI: http://localhost:15672

Username: guest

Password: guest

2. Start Spring Boot Application

Make sure you have Maven and Java 17+ installed.

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./mvnw clean install
./mvnw spring-boot:run
Or if using regular Maven:

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mvn clean install
mvn spring-boot:run
The application will start on: http://localhost:8080

🔁 REST API Endpoints

✅ POST /notifications

Send a notification.

URL: http://localhost:8080/notifications

Method: POST

Headers: Content-Type: application/json

Body Example:

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{
  "userId": 101,
  "type": "EMAIL",
  "message": "Welcome to My Notification_server System through email!"
}

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{
  "userId": 102,
  "type": "SMS",
  "message": "Welcome to My Notification_server System through sms!"
}

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{
  "userId": 103,
  "type": "In_APP",
  "message": "Welcome to My Notification_server System through IN_App!"
}

📩 GET /users/{userId}/notifications

Fetch all notifications for a specific user.

URL: http://localhost:8080/users/{userId}/notifications

Method: GET URL: http://localhost:8080/users/101/notifications

URL: http://localhost:8080/users/102/notifications

URL: http://localhost:8080/users/103/notifications

🔁 RabbitMQ Integration

Spring Boot connects to RabbitMQ using spring.rabbitmq.host=localhost

Queue name should be defined consistently in RabbitMQConfig.java

Messages sent through /notifications are pushed to the queue

Consumers can listen to the same queue and process them asynchronously

##📬 Postman Testing You can test both APIs using Postman:

POST http://localhost:8080/notifications

Send JSON body with userId, type (EMAIL, SMS, IN_APP), and message.

GET http://localhost:8080/users/{userId}/notifications

Replace {userId} with a valid ID (e.g., 123).

🛠 Tech Stack

Java 17+

Spring Boot 3.x

RabbitMQ --

WE firstly set up a run RabbitMq as-

You should see the following queues listed (or similar, based on your configuration):

emailQueue:

smsQueue:

inAppQueue:

FINAL OVERVIEW:

Maven

Docker START:

sudo systemctl start docker
docker start rabbitmq

Postman

🧼 Stopping Docker RabbitMQ To stop and remove the RabbitMQ container:

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docker stop rabbitmq
docker rm rabbitmq