cynos-storage

Storage layer for Cynos in-memory database.

Overview

This crate provides the storage layer including:

• RowStore: Row storage with index maintenance
• TableCache: Multi-table cache management
• Journal: Change tracking for transactions
• Transaction: Transaction management with rollback support
• ConstraintChecker: Constraint validation
• LockManager: Concurrent access control

Features

• #![no_std] compatible
• ACID transaction support
• Automatic index maintenance
• Constraint enforcement (primary key, unique, foreign key)
• Optional hash-based storage via hash-store feature

Usage

use cynos_storage::{TableCache, Transaction};
use cynos_core::schema::TableBuilder;
use cynos_core::{DataType, Row, Value};

// Create a cache and table
let mut cache = TableCache::new();
let schema = TableBuilder::new("users")
    .unwrap()
    .add_column("id", DataType::Int64)
    .unwrap()
    .add_column("name", DataType::String)
    .unwrap()
    .add_primary_key(&["id"], false)
    .unwrap()
    .build()
    .unwrap();
cache.create_table(schema).unwrap();

// Use a transaction
let mut tx = Transaction::begin();
let row = Row::new(1, vec![Value::Int64(1), Value::String("Alice".into())]);
tx.insert(&mut cache, "users", row).unwrap();
tx.commit().unwrap();

assert_eq!(cache.get_table("users").unwrap().len(), 1);

Transaction Support

• begin(): Start a new transaction
• insert(), update(), delete(): DML operations
• commit(): Commit changes
• rollback(): Rollback changes

License

Apache-2.0