added prescription notification

[louissosthenes9]

Bug Description

Yes, the bug is related to the problem: the lack of notifications when a new prescription is described. See the detailed issue below:

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Proposed Solution

To address this issue, we propose using Server-Side Events (SSE) to create an endpoint in the server that allows the client UI to subscribe and listen for notifications. This is demonstrated in the following steps, as shown in the referenced pull request:

Step 1: Create a Prescription Notification Module

The solution begins with the creation of the Prescription Notification Module, including the following key components:

1. Controller: Exposes the SSE endpoint for client subscriptions.
2. Prescription Message Constructor: Constructs a standardized notification message.
3. Prescription Service: Handles business logic, including fetching patient names from the Patient Model.

See the implementation snapshots below:
Controller:

Message Constructor:

Prescription Service:

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Step 2: Dispatch Notifications

Notifications are dispatched each time a prescription is triggered by modifying the iCare service implementation:

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Step 3: Client-Side Notification Handling

On the UI side, we added:

1. Notification Service (notification.service.ts): Listens for events from the server.
2. Notification Component: Displays notifications conditionally when a dose is prescribed, pushing updates into the UI.

Implementation preview:

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Final Results

With mock data, the notification system functions as expected, displaying notifications in the UI:

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Alternatives Considered

Backend Alternatives:

• Spring WebSocket: A more complex approach for this use case.
• Polling: Cumbersome to implement and resource-intensive.

UI Alternatives:

• Adding a Notification Window Tab for the Pharmacist Module.
• Using Modals for displaying prescriptions.
• Utilizing the Sonner Library for well-designed notifications.

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Contributors

The following team members contributed to the solution:

• Louis Sosthenes Konyoka (2022-04-04729)
• Khafsa Hassan Lulela (2021-04-04973)
• Diana Modest Deo (2022-04-01537)
• Keneth Martin Kilimba (2022-04-04249)
• Arnold Andrew Masmini (2022-04-06484)

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