import Transaction from '../../Services/Transaction/Transaction.service';
import type { InMemoryCache } from '../../Memory/memory.operation';
/**
 * Tracks active in-flight Transaction objects keyed by connection ID and transaction ID.
 * One AxioDB singleton per process means one TransactionManager singleton too.
 *
 * Lifecycle:
 *  1. BEGIN_TRANSACTION -> create Transaction, store under (connectionId, transactionId)
 *  2. CRUD with transactionId -> retrieve Transaction, call insert/update/delete
 *  3. COMMIT / ROLLBACK -> call commit()/rollback(), remove from store
 *  4. Connection drop -> rollbackAllForConnection() cleans up orphaned transactions
 */
export default class TransactionManager {
    private static instance;
    private activeTransactions;
    private transactionPaths;
    private connectionCollections;
    private constructor();
    static getInstance(): TransactionManager;
    beginTransaction(connectionId: string, collectionPath: string, cache: InMemoryCache): Transaction;
    getTransaction(connectionId: string, transactionId: string): Transaction | undefined;
    removeTransaction(connectionId: string, transactionId: string): void;
    getCollectionPath(transactionId: string): string | undefined;
    rollbackAllForConnection(connectionId: string): Promise<void>;
    getActiveTransactionCount(): number;
    hasTransaction(connectionId: string, transactionId: string): boolean;
}