@daisugi/kintsugi/src/simple_memory_store.ts

Kintsugi is a set of utilities to help build a fault tolerant services.

import { Result } from '@daisugi/anzen';
import { Ayamari } from '@daisugi/ayamari';

import type { CacheStore } from './with_cache.js';

const { errFn } = new Ayamari();

export class SimpleMemoryStore implements CacheStore {
  #store;

  constructor() {
    this.#store = Object.create(null);
  }

  get(cacheKey: string) {
    const value = this.#store[cacheKey];
    if (typeof value === 'undefined') {
      return Result.failure(
        errFn.NotFound('Not found in cache.'),
      );
    }
    return Result.success(value);
  }

  set(cacheKey: string, value: any) {
    this.#store[cacheKey] = value;
    return Result.success(value);
  }

  delete(cacheKey: string) {
    this.#store[cacheKey] = undefined;
    return Result.success(cacheKey);
  }

  weakDelete(cacheKey: string) {
    this.#store[cacheKey] = undefined;
    return Result.success(cacheKey);
  }
}