Design a Task Scheduler

Functional Requirements

1. Task Creation and Management:

   • Users should be able to create, update, and delete tasks.
   • Tasks should have attributes like name, description, priority, and due date.
   • Support for recurring tasks.

2. Task Execution:

   • Execute tasks at the scheduled time.
   • Support for different types of tasks (e.g., one-time, recurring).
   • Ability to pause, resume, or cancel tasks.

3. Task Monitoring and Logging:

   • Provide real-time status updates on task execution.
   • Log task execution history for auditing and debugging.
   • Notify users of task completion or failure.

4. User Management:

   • Authenticate users to ensure secure access.
   • Support for multiple user roles with different permissions.

5. Integration and Extensibility:

   • Ability to integrate with third-party services or APIs.
   • Provide hooks or plugins for custom task types.

6. Scalability:

   • Handle a large number of tasks and users efficiently.

7. Concurrency:

   • Support concurrent execution of multiple tasks.

8. Time Zone Support:

   • Schedule tasks based on user-specific time zones.

Non-Functional Requirements

1. Performance:

   • Tasks should be executed with minimal latency.
   • The system should handle high throughput of task requests.

2. Reliability:

   • Ensure high availability of the task scheduler.
   • Implement mechanisms for task retry in case of failure.

3. Scalability:

   • The system should scale horizontally to accommodate increased load.

4. Security:

   • Protect against unauthorized access and data breaches.
   • Implement encryption for sensitive data.

5. Consistency:

   • Ensure data consistency across distributed components.

6. Resilience:

   • The system should gracefully handle failures and recover quickly.

7. Latency:

   • Minimize the delay between task scheduling and execution.

8. Observability:

   • Provide metrics and monitoring tools to track system performance.

9. Cost Efficiency:

   • Optimize resource usage to reduce operational costs.

By clearly defining these functional and non-functional requirements, we lay the groundwork for designing a robust and efficient task scheduler system.