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Change List
Client-Server Architecture
Status: Satisfied
The system operates on a robust client-server architecture using WebSocket connections.
The server, built using tokio_tungstenite, listens for WebSocket connections from clients, enabling real-time communication.
Both Rust and Dart clients establish WebSocket connections to the central server.
An integration test (test_server_integration) demonstrates the connection process, data exchange, and successful communication between the client and server.
State Management
Status: Partially Satisfied
- Server-Side: The server maintains a centralized DocumentState that tracks the current content and version of the document.
- Client-Side: Clients currently send edits and receive document updates but do not maintain an independent, local copy of DocumentState.
Enhancement Required
To fully meet the requirement for decentralized state management, each client must maintain a local DocumentState and be able to apply edits locally before sending updates to the server. This will allow clients to manage their state autonomously and resolve conflicts more efficiently.
Edit Propagation
Status: Satisfied
When a client submits an edit, the edit is sent to the server and applied to the central DocumentState.
After processing, the server broadcasts the edit to all other connected clients.
The integration test shows how this process works: clients send edits to the server, and the server propagates those edits to all other clients.
Consistency Maintenance
Status: Not Fully Satisfied
The current system uses a version control mechanism to ensure that edits are applied in the correct order. If a version mismatch is detected, the edit is rejected.
Current Limitation
This approach doesn't handle concurrent edits efficiently and can lead to rejected edits without resolving conflicts.
Enhancement Required
To fully satisfy this requirement, an Operational Transform (OT) or Conflict-Free Replicated Data Types (CRDT) system needs to be implemented. This would ensure that concurrent edits are transformed into a consistent order, resolving conflicts automatically and ensuring consistency across all clients without rejecting valid edits.
Future Enhancements:
Local State Management for Clients: Implement a client-side DocumentState to mirror the server's state. This will allow clients to apply edits locally and operate more independently.
Operational Transform (OT) or CRDT:
Implement OT or CRDT to resolve conflicting edits and ensure that concurrent operations from multiple clients are applied consistently across the system.