51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
import NodeCache from 'node-cache';
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import getPreviousLotIdFromDatabase from './lotOccupancyDB/getPreviousLotId.js';
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import getNextLotIdFromDatabase from './lotOccupancyDB/getNextLotId.js';
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const cacheOptions = {
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stdTTL: 2 * 60,
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useClones: false
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};
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const previousLotIdCache = new NodeCache(cacheOptions);
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const nextLotIdCache = new NodeCache(cacheOptions);
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function cacheLotIds(lotId, nextLotId) {
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previousLotIdCache.set(nextLotId, lotId);
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nextLotIdCache.set(lotId, nextLotId);
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}
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export async function getNextLotId(lotId) {
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let nextLotId = nextLotIdCache.get(lotId);
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if (nextLotId === undefined) {
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nextLotId = await getNextLotIdFromDatabase(lotId);
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if (nextLotId !== undefined) {
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cacheLotIds(lotId, nextLotId);
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}
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}
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return nextLotId;
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}
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export async function getPreviousLotId(lotId) {
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let previousLotId = previousLotIdCache.get(lotId);
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if (previousLotId === undefined) {
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previousLotId = await getPreviousLotIdFromDatabase(lotId);
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if (previousLotId !== undefined) {
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cacheLotIds(previousLotId, lotId);
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}
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}
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return previousLotId;
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}
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export function clearNextPreviousLotIdCache(lotId) {
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if (lotId === undefined) {
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previousLotIdCache.flushAll();
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nextLotIdCache.flushAll();
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return;
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}
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const previousLotId = previousLotIdCache.get(lotId);
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if (previousLotId !== undefined) {
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nextLotIdCache.del(previousLotId);
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previousLotIdCache.del(lotId);
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}
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const nextLotId = nextLotIdCache.get(lotId);
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if (nextLotId !== undefined) {
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previousLotIdCache.del(nextLotId);
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nextLotIdCache.del(lotId);
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}
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}
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