Implement Notification Service

[Ziadsharkos]

As a Sporta User, I want to receive real-time notifications for events such as event cancellations, friend requests, and friend request acceptances so that I can stay informed about important updates in the application.

Story Points: 8
Priority: High
Risk: High
Child of: #1

Task Breakdown:

1. Create Notification Entity and Repository:

• Define the Notification entity with fields: id, userId, message, type, createdAt, isRead.

• Create NotificationRepository for CRUD operations.

2. Implement Notification Service:

• Add methods to send, fetch, and mark notifications as read.

• Use SimpMessagingTemplate to send real-time notifications via WebSocket.

3. Integrate with Existing Services:

• Modify UserServiceImpl to send notifications for friend requests and acceptances.

• Modify EventServiceImpl to send notifications for event cancellations.

4. Add REST Endpoints:

• Create NotificationController with endpoints:

• GET /notifications/{userId}: Fetch all notifications for a user.

• GET /notifications/{userId}/unread: Fetch unread notifications for a user.

PATCH /notifications/{notificationId}/read: Mark a notification as read.

Acceptance Criteria:

• Notifications are sent to users when:

1. An event they are registered for is cancelled.

2. They receive a friend request.

3. Their friend request is accepted.

• Notifications are stored in the database and can be fetched via REST API.

• Real-time notifications are delivered to users via WebSocket.

• Users can mark notifications as read.

Blackbox Testing:

1. Verify that notifications are sent when:

• An event is cancelled.

• A friend request is sent.

• A friend request is accepted.

2. Verify that notifications are stored in the database and can be fetched via REST API.

3. Verify that real-time notifications are delivered to the frontend via WebSocket.

4. Verify that users can mark notifications as read.

Regression Testing:

1. Ensure that existing functionality (e.g., event management, friend requests) is not broken after integrating the notification service.

2. Test the performance impact of sending real-time notifications.

Precondition:

• To be successfully logged in to your Sporta account with a valid username and password.

Demo Steps:

1. Send a Friend Request:

• Log in as User A.
• Send a friend request to User B.
• Verify that User B receives a real-time notification.

2. Accept a Friend Request:

• Log in as User B.
• Accept the friend request from User A.
• Verify that User A receives a real-time notification.

3. Cancel an Event:

• Log in as an event organizer.
• Cancel an event that User A is registered for.
• Verify that User A receives a real-time notification.

4. Mark Notifications as Read:

• Log in as User A.
• View notifications and mark them as read.
• Verify that the notifications are marked as read in the database.

5. Fetch Notifications via REST API:

• Use the REST API to fetch all notifications and unread notifications for User A.
• Verify that the correct notifications are returned.