@prezly/theme-kit-core/build/content-delivery/cache/memory.test.mjs

Data layer and utility library for developing Prezly themes with JavaScript

import { createSharedMemoryCache, RECORDS_LIMIT } from "./memory.mjs";
describe('createSharedMemoryCache', () => {
  it('should write and read keys', () => {
    var cache = createSharedMemoryCache();
    expect(cache.get('hello', 0)).toBeUndefined();
    cache.set('hello', 'world', 0);
    expect(cache.get('hello', 0)).toBe('world');
  });
  it('should delete accessed records if the current version is higher', () => {
    var cache = createSharedMemoryCache();
    cache.set('hello', 'world', 0);
    expect(cache.get('hello', 0)).toBe('world');
    expect(cache.get('hello', 1)).toBeUndefined();
    expect(cache.get('hello', 0)).toBeUndefined();
  });
  it('should separate datasets by namespace', () => {
    var cache = createSharedMemoryCache();
    var a = cache.namespace('a:');
    var b = cache.namespace('b:');
    a.set('hello', 'world', 0);
    b.set('hello', 'universe', 0);
    expect(cache.get('hello', 0)).toBeUndefined();
    expect(a.get('hello', 0)).toBe('world');
    expect(b.get('hello', 0)).toBe('universe');
  });
  it('should garbage-collect old cache records when threshold is reached (with a chance of 1/100)', () => {
    var cache = createSharedMemoryCache();
    for (var i = 0; i < RECORDS_LIMIT; i += 1) {
      cache.set("record-".concat(i), "value-".concat(i), 0);
    }
    for (var _i = 0; _i < RECORDS_LIMIT; _i += 1) {
      expect(cache.get("record-".concat(_i), 0)).toBe("value-".concat(_i));
    }

    // Write 10% more records, 10 times to trigger CG
    for (var repeat = 0; repeat < 100; repeat += 1) {
      for (var _i2 = RECORDS_LIMIT; _i2 < RECORDS_LIMIT * 1.1; _i2 += 1) {
        cache.set("record-".concat(_i2), "value-".concat(_i2), 0);
      }
    }

    // the oldest part of the cache should be removed already
    for (var _i3 = 0; _i3 < RECORDS_LIMIT * 0.09; _i3 += 1) {
      expect(cache.get("record-".concat(_i3), 0)).toBeUndefined();
    }

    // and the rest kept
    for (var _i4 = RECORDS_LIMIT * 0.11; _i4 < RECORDS_LIMIT * 1.1; _i4 += 1) {
      expect(cache.get("record-".concat(_i4), 0)).toBe("value-".concat(_i4));
    }
  });
});