@superset-ui/core
Version:
65 lines • 2.07 kB
JavaScript
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
class LRUCache {
cache;
capacity;
constructor(capacity) {
if (capacity < 1) {
throw new Error('The capacity in LRU must be greater than 0.');
}
this.capacity = capacity;
this.cache = new Map();
}
has(key) {
return this.cache.has(key);
}
get(key) {
// Prevent runtime errors
if (typeof key !== 'string') {
throw new TypeError('The LRUCache key must be string.');
}
if (this.cache.has(key)) {
const tmp = this.cache.get(key);
this.cache.delete(key);
this.cache.set(key, tmp);
return tmp;
}
return undefined;
}
set(key, value) {
// Prevent runtime errors
if (typeof key !== 'string') {
throw new TypeError('The LRUCache key must be string.');
}
if (this.cache.size >= this.capacity) {
this.cache.delete(this.cache.keys().next().value);
}
this.cache.set(key, value);
}
clear() {
this.cache.clear();
}
get size() {
return this.cache.size;
}
}
export function lruCache(capacity = 100) {
return new LRUCache(capacity);
}
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