@bitblit/ratchet-aws/lib/sync-lock/memory-sync-lock.js

Common tools for use with AWS browser and node

import { StringRatchet } from '@bitblit/ratchet-common/lang/string-ratchet';
export class MemorySyncLock {
    _locks = new Map();
    constructor() {
    }
    async acquireLock(lockKey, expirationSeconds = 30) {
        let rval = false;
        if (StringRatchet.trimToNull(lockKey)) {
            const now = Date.now();
            const val = this._locks.get(lockKey);
            if (!val || val < now) {
                this._locks.set(lockKey, now + expirationSeconds * 1000);
                rval = true;
            }
        }
        return rval;
    }
    async releaseLock(lockKey) {
        if (StringRatchet.trimToNull(lockKey)) {
            this._locks.delete(lockKey);
        }
    }
    async clearExpiredSyncLocks() {
        const toRemove = [];
        const now = Date.now();
        this._locks.forEach((v, k) => {
            if (v < now) {
                toRemove.push(k);
            }
        });
        toRemove.forEach((k) => {
            this._locks.delete(k);
        });
        return toRemove.length;
    }
}
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