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implemented LRU cache

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This commit is contained in:
Jack Case
2025-12-29 17:17:52 +00:00
parent c43dc8f7b3
commit 2733ccc737
2 changed files with 63 additions and 40 deletions
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46
spec/indexeddb_spec.js
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@@ -3,7 +3,7 @@ import { openDB, deleteDB } from "../scripts/idb/index.js"
const MAX_TIMESTAMP_DIFFERENCE = 3
describe("sanity check", () => {
xdescribe("sanity check", () => {
it("works", () => {
expect(true).toBeTrue()
})
@@ -38,6 +38,13 @@ describe("SlopDB", () => {
describe("version 2", () => {
let slopdb
let mock_clock
beforeAll(() => {
const j_clock = jasmine.clock()
mock_clock = j_clock.install()
mock_clock.mockDate(new Date(2020, 1, 1))
})
beforeEach(async () => {
slopdb = new SlopDB(2)
@@ -60,17 +67,20 @@ describe("SlopDB", () => {
const slop_url = new URL("https://sloppy-slop.com/sloparticle")
await cache.store(slop_url.toString())
const new_item = await cache.store(slop_url.toString())
const store_time = Date.now()
mock_clock.tick(1000)
const cached_item = await cache.get(slop_url.toString())
expect(cached_item.url).toEqual(slop_url.toString())
expect(cached_item.check_timestamp).toBeLessThanOrEqual(store_time)
expect(cached_item.check_timestamp).toBeGreaterThan(store_time - MAX_TIMESTAMP_DIFFERENCE)
expect(new_item.check_timestamp).toBeCloseTo(store_time)
expect(new_item.check_timestamp).toBeGreaterThan(store_time - MAX_TIMESTAMP_DIFFERENCE)
})
it("updates a cached url's timestamp when it is accessed", async () => {
const mock_clock = clock.install()
const cache = slopdb.get_check_cache()
const slop_url = new URL("https://sloppy-slop.com/sloparticle")
@@ -79,8 +89,30 @@ describe("SlopDB", () => {
mock_clock.tick(1000 * 30)
const cached_item = cache.get(slop_url.toString())
expect(cached_item.check_timestamp).toEqual(store_time + 30)
const cached_item = await cache.get(slop_url.toString())
expect(cached_item.check_timestamp).toBeGreaterThan(store_time + 10)
})
it("evicts the least recently accessed URL when an item is added to a full cache", async () => {
const cache = slopdb.get_check_cache()
cache.cache_capacity = 2
const slop_url = new URL("https://sloppy-slop.com/sloparticle")
await cache.store(slop_url.toString())
mock_clock.tick(1000)
const slop_url2 = new URL("https://sloppy-slop.com/sloparticle2")
await cache.store(slop_url2.toString())
mock_clock.tick(1000)
const slop_url3 = new URL("https://sloppy-slop.com/sloparticle3")
await cache.store(slop_url3.toString())
const get_slop1 = await cache.get(slop_url.toString())
expect(get_slop1).toBeUndefined()
expect(cache.size).toEqual(2)
})
})