51 lines
1.0 KiB
JavaScript
Executable File
51 lines
1.0 KiB
JavaScript
Executable File
// SPDX-License-Identifier: LGPL-2.1-or-later
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// Copyright (c) 2015-2024 MariaDB Corporation Ab
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'use strict';
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const LRU = require('lru-cache');
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/**
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* LRU prepare cache
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*
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*/
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class LruPrepareCache {
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#lruCache;
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#info;
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constructor(info, prepareCacheLength) {
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this.#info = info;
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this.#lruCache = new LRU.LRUCache({
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max: prepareCacheLength,
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dispose: (value, key) => value.unCache()
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});
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}
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get(sql) {
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const key = this.#info.database + '|' + sql;
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const cachedItem = this.#lruCache.get(key);
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if (cachedItem) {
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return cachedItem.incrementUse();
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}
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return null;
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}
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set(sql, cache) {
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const key = this.#info.database + '|' + sql;
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this.#lruCache.set(key, cache);
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}
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toString() {
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let keyStr = '';
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for (const value of this.#lruCache.keys()) {
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keyStr += '[' + value + '],';
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}
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if (keyStr.length > 1) keyStr = keyStr.substring(0, keyStr.length - 1);
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return 'info{cache:' + keyStr + '}';
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}
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reset() {
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this.#lruCache.clear();
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}
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}
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module.exports = LruPrepareCache;
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