@powersync/react-native/lib/sync/stream/ReactNativeStreamingSyncImplementation.js

PowerSync React Native SDK. Sync Postgres, MongoDB or MySQL with SQLite in your React Native app

import { AbstractStreamingSyncImplementation, LockType } from '@powersync/common';
import Lock from 'async-lock';
/**
 * Global locks which prevent multiple instances from syncing
 * concurrently.
 */
const LOCKS = new Map();
export class ReactNativeStreamingSyncImplementation extends AbstractStreamingSyncImplementation {
    locks;
    constructor(options) {
        super(options);
        this.initLocks();
    }
    /**
     *  Configures global locks on sync process
     */
    initLocks() {
        const { identifier } = this.options;
        if (identifier && LOCKS.has(identifier)) {
            this.locks = LOCKS.get(identifier);
            return;
        }
        this.locks = new Map();
        this.locks.set(LockType.CRUD, new Lock());
        this.locks.set(LockType.SYNC, new Lock());
        if (identifier) {
            LOCKS.set(identifier, this.locks);
        }
    }
    obtainLock(lockOptions) {
        const lock = this.locks.get(lockOptions.type);
        if (!lock) {
            throw new Error(`Lock type ${lockOptions.type} not found`);
        }
        return lock.acquire(lockOptions.type, async () => {
            if (lockOptions.signal?.aborted) {
                throw new Error('Aborted');
            }
            return lockOptions.callback();
        });
    }
}