realm/realm-java
Realm Java
Realm Java is a NoSQL mobile object database and reactive database engine. It provides a persistent local data store that saves native objects directly to disk, replacing traditional SQL storage and object-relational mapping layers.
The system functions as a real-time data synchronizer, coordinating local database changes with a cloud backend across multiple devices. It integrates a reactive engine that uses change listeners and asynchronous event streams to automatically update user interfaces when underlying data changes.
The project covers object-oriented data modeling, CRUD operations, and schema-based versioning for database migrations. It includes security features such as hardware-optimized database file encryption and user authentication for identity management. Additional capabilities include storage optimization through file compaction and build-time code stripping to remove unused classes.
Features
- Mobile Storage Engines - Provides a specialized object-oriented storage engine optimized for persisting structured data as native objects on mobile devices.
- Native Object Databases - Functions as a mobile object database that saves native objects directly to disk, bypassing relational mapping.
- Data Querying - Offers a typed API and query language for filtering, retrieving, and sorting objects within the database.
- Database Change Listeners - Provides utilities for monitoring and reacting to data modifications via real-time change listeners.
- Database Schema Migrations - Automates versioned updates to the local database schema to maintain structural compatibility during application upgrades.
- CRUD Interfaces - Provides a native query interface for performing standard create, read, update, and delete operations.
- Reactive View Bindings - Provides mechanisms that automatically update user interface components in response to underlying database changes.
- Differential Synchronization - Coordinates local and remote states by syncing only incremental data subsets to optimize bandwidth.
- Object-Oriented Databases - Functions as a mobile-optimized database engine that stores data as native objects, eliminating the need for relational mapping.
- Schema-Driven Object Modeling - Provides the ability to define database schemas using object types that align with native programming language structures.
- Zero-Copy Mappings - Maps database records directly to native objects to eliminate the need for traditional object-relational mapping layers.
- Reactive Data Queries - Implements live queries that trigger interface updates automatically when underlying data changes.
- Reactive Databases - Provides a reactive database engine that uses change listeners and streams to trigger automatic user interface updates.
- Real-time Data Synchronization - Coordinates real-time data updates across multiple users and devices via a cloud backend to maintain a consistent state.
- Schema Versioning - Manages database structure updates through a migration system that preserves data during application upgrades.
- Conflict Resolution & Recovery - Implements mechanisms to recover unsynced local data and resolve conflicts during synchronization resets or server rollbacks.
- Database Connection Managers - Manages the initialization and configuration of persistent connections to local data stores.
- Multi-Version Concurrency Control - Implements a multi-version concurrency control model to enable non-blocking read and write operations.
- B-Tree - Utilizes a specialized storage engine that organizes data in B-Tree structures to optimize disk-based lookups.
- Transaction Management - Supports executing data modifications through a transactional model with commit and cancel capabilities.
- C++ Language Bridges - Interfaces Java language structures with a high-performance native C++ database core for improved mobile efficiency.
- Encrypted Database Managers - Offers a secure storage solution that uses hardware-optimized encryption to protect database files from unauthorized local access.
- Encrypted Persistence - Secures application data at rest on local device storage using robust encryption to prevent unauthorized access.
- Database Page Encryption - Secures stored data at rest by encrypting individual database file pages using hardware-optimized encryption.
- Mobile Database Security - Protects sensitive on-device information using hardware-optimized encryption and manages user access through authentication.
- Reactive State Management - Binds database queries to asynchronous event streams to automatically synchronize UI elements with underlying data changes.
- Database Tools - Mobile-first embedded database for local storage.
- Persistence - Mobile database replacement for SQLite.
- Database Management - Modern, object-oriented alternative to traditional SQLite databases.
