27 lines
584 B
TypeScript
27 lines
584 B
TypeScript
export class Cache<T> {
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private cache: Map<string | null, { date: number; value: T; }>;
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private lifetime: number;
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constructor(lifetime: Cache<never>['lifetime']) {
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this.cache = new Map();
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this.lifetime = lifetime;
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}
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public set(key: string | null, value: T): void {
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this.cache.set(key, {
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date: Date.now(),
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value
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});
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}
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public get(key: string | null): T | null {
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const cached = this.cache.get(key);
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if (cached == null) return null;
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if ((Date.now() - cached.date) > this.lifetime) {
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this.cache.delete(key);
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return null;
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}
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return cached.value;
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}
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}
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