J
josephg/sharejs
Sharejs
ShareJS ist eine kollaborative Dokumentendatenbank und Synchronisations-Engine, die für die Verwaltung gemeinsam genutzter Zustände in Echtzeit konzipiert ist. Sie bietet eine Operational-Transform-Sync-Engine, um die gleichzeitige Bearbeitung von Klartext- und JSON-Daten zu ermöglichen, sowie eine RESTful-Synchronisations-API für die Verwaltung von Dokumentzuständen via HTTP.
Das System verfügt über eine Offline-First-Datensynchronisationsschicht, die lokale Änderungen bei Verbindungsunterbrechung in eine Warteschlange stellt und Bearbeitungen bei Wiederherstellung der Verbindung automatisch überträgt. Es enthält zudem eine Middleware-Zugriffskontrollschicht, die Datenbankanfragen abfängt, um Sicherheitsrichtlinien durchzusetzen und Anfragen umzuschreiben.
Die Plattform deckt ein breites Spektrum an Funktionen ab, einschließlich Live-Query-Abonnements, Echtzeit-Änderungsbenachrichtigungen und gleichzeitiger Inhaltssynchronisation. Diese Komponenten ermöglichen die Erstellung von Daten-Feeds, bei denen Clients sofort benachrichtigt werden, wenn Backend-Dokumente, die bestimmten Abfragen entsprechen, aktualisiert werden.
Features
- Operational Transformation Engines - Implements a synchronization engine that manages document state through atomic modification operations using operational transform.
- Operational Transformation - Implements operational transform algorithms to resolve concurrent editing conflicts and maintain consistent document states across distributed clients.
- Client-Server State Synchronization - Maintains coherence between remote server state and local client state using a real-time synchronization engine.
- Live Query Engines - Implements a live query engine that returns auto-updating result sets reflecting the latest backend document state.
- Document Databases - Provides a document-oriented database designed for shared documents with live-bound queries and real-time updates.
- Event-Driven Subscription Systems - Pushes real-time document updates to clients via persistent connections to ensure immediate synchronization of remote edits.
- Client-Side Buffers - Implements a persistent client-side buffer that queues document modifications during network interruptions for automatic synchronization upon reconnection.
- Offline-First Persistence - Implements offline-first persistence allowing users to edit documents while disconnected and sync upon reconnection.
- Real-time Data Subscriptions - Provides a real-time data feed for clients to subscribe to live database updates via persistent streams.
- Collaborative Document Management - Provides lifecycle management for shared documents, including creation, retrieval, and deletion with state synchronization.
- REST-Based Database Synchronization - Provides a REST-based interface for triggering synchronization actions and managing shared document states via HTTP.
- Resource Access Control Layers - Implements a resource access control layer that intercepts database requests to enforce security policies and rewrite queries.
- Data Sync Conflict Resolution - Uses operational transform as a conflict resolution strategy to synchronize concurrent edits of plain-text and JSON data.
- Offline-First Synchronization - Provides architectural support for offline-first synchronization, queuing local modifications and merging them after reconnection.
- Request Interception Middleware - Uses request interception middleware to validate permissions and rewrite database queries before execution for secure data access.
- Offline Request Queues - Queues document modifications in local storage during offline periods for automatic retry upon reconnection.
- Real-Time Collaborative Editing - Supports real-time collaborative editing of JSON and plain-text documents with automatic conflict resolution.
- REST API Interfaces - Provides server-side RESTful endpoints to manage document states and trigger synchronization engine actions via standard HTTP methods.
- Database Request Rewriting - Ships a middleware layer that intercepts and rewrites database requests to enforce granular security and access policies.
- Engine-to-API Mappings - Translates standard HTTP methods into internal synchronization engine actions to expose document state as a web interface.
- Collaborative Editing - Library for concurrent content editing using operational transforms.
