feat: v0.2.0 AriaEngine 自研存储引擎
- 新增 AriaEngine: LSM-Tree 页面式存储引擎，19 个模块，~3500 行 TS - page/: Slotted Page 格式 (header/slot/tuple/format) + CRC32 - buffer/: Buffer Pool (LRU 缓存 + 驱逐策略) - index/: LSM-Tree (MemTable 红黑树 + SSTable + Bloom Filter + Merge Iterator) - wal/: WAL 日志 (二进制格式) + Checkpoint 管理 - transaction/: MVCC 版本链 + 快照隔离 - store/: IndexedDB / Memory 双后端抽象 - compression/: LZ4 页面压缩 - 完整持久化: Schema 自动保存、SSTable 元数据管理、WAL 恢复 - 事务感知 CRUD: insert/update/delete 在事务中缓冲到 snapshot - mode: 'aria' 激活自研引擎 - 新增 7 个测试文件，测试数 318 → 524，套件 20 → 27 - aria-page.test.ts (32 tests): Page 格式单元测试 - aria-index.test.ts (26 tests): Bloom Filter + MemTable - aria-sstable.test.ts (9 tests): SSTable Builder + Reader - aria-buffer.test.ts (25 tests): LRU + Eviction + Buffer Pool - aria-wal-mvcc.test.ts (22 tests): WAL 编解码 + MVCC 事务 - aria-compress.test.ts (11 tests): LZ4 + Merge Iterator - aria.test.ts (80 tests): AriaEngine 集成 + 边界测试 - Bug 修复: LRUList size 跟踪、WAL 缓冲区越界、ColumnEncoding 导入 - 全面更新 README.md + site/ 站点文件 (index/docs/demo)
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/**
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* AriaEngine Buffer Pool + Eviction 单元测试
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*/
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import { BufferPool, type PageIO } from '../../src/engine/aria/buffer/pool';
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import { LRUList, EvictionManager } from '../../src/engine/aria/buffer/eviction';
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import { PageType, PAGE_SIZE } from '../../src/engine/aria/types';
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import { initPageHeader } from '../../src/engine/aria/page/header';
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// ===================================================================
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// LRUList
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// ===================================================================
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describe('AriaEngine — LRUList', () => {
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function makePage(id: number) {
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const data = new ArrayBuffer(PAGE_SIZE);
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initPageHeader(data, id, PageType.DATA);
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return { pageId: id, type: PageType.DATA, data, dirty: false, pins: 0, prev: null, next: null, lastAccess: Date.now() };
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}
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it('moveToHead — 单元素', () => {
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const list = new LRUList();
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const p = makePage(1);
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list.moveToHead(p);
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expect(list.size).toBe(1);
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});
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it('moveToHead — 多元素保持 MRU 顺序', () => {
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const list = new LRUList();
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const a = makePage(1);
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const b = makePage(2);
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const c = makePage(3);
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list.moveToHead(a);
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list.moveToHead(b);
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list.moveToHead(c);
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expect(list.size).toBe(3);
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// c 是最新的
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});
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it('getLRU 返回最久未使用', () => {
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const list = new LRUList();
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const a = makePage(1);
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const b = makePage(2);
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list.moveToHead(a);
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list.moveToHead(b);
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expect(list.getLRU()!.pageId).toBe(1);
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});
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it('popLRU 移除并返回最久未使用', () => {
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const list = new LRUList();
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const a = makePage(1);
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const b = makePage(2);
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list.moveToHead(a);
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list.moveToHead(b);
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const popped = list.popLRU();
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expect(popped!.pageId).toBe(1);
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expect(list.size).toBe(1);
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});
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it('remove — 从中间移除', () => {
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const list = new LRUList();
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const a = makePage(1);
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const b = makePage(2);
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const c = makePage(3);
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list.moveToHead(a);
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list.moveToHead(b);
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list.moveToHead(c);
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list.remove(b);
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expect(list.size).toBe(2);
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});
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it('clear 清空', () => {
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const list = new LRUList();
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list.moveToHead(makePage(1));
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list.moveToHead(makePage(2));
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list.clear();
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expect(list.size).toBe(0);
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});
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it('getAllPages 返回所有页面', () => {
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const list = new LRUList();
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list.moveToHead(makePage(1));
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list.moveToHead(makePage(2));
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expect(list.getAllPages()).toHaveLength(2);
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});
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it('空 LRU getLRU 返回 null', () => {
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const list = new LRUList();
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expect(list.getLRU()).toBeNull();
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});
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it('空 LRU popLRU 返回 null', () => {
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const list = new LRUList();
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expect(list.popLRU()).toBeNull();
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});
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it('moveToHead 同元素不移重复', () => {
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const list = new LRUList();
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const p = makePage(1);
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list.moveToHead(p);
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list.moveToHead(p);
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list.moveToHead(p);
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expect(list.size).toBe(1);
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});
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});
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// ===================================================================
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// EvictionManager
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// ===================================================================
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describe('AriaEngine — EvictionManager', () => {
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function makePage(id: number, dirty = false) {
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const data = new ArrayBuffer(PAGE_SIZE);
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initPageHeader(data, id, PageType.DATA);
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return { pageId: id, type: PageType.DATA, data, dirty, pins: 0, prev: null, next: null, lastAccess: Date.now() };
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}
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it('access 更新 LRU', async () => {
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let evicted = -1;
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const em = new EvictionManager(3, async (p) => { evicted = p.pageId; });
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const p = makePage(1);
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em.add(p);
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em.access(p);
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expect(em.getSize()).toBe(1);
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});
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it('add 不超过容量不触发驱逐', async () => {
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const evictedPages: number[] = [];
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const em = new EvictionManager(4, async (p) => { evictedPages.push(p.pageId); });
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em.add(makePage(1));
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em.add(makePage(2));
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em.add(makePage(3));
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await em.evictIfNeeded(1);
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expect(evictedPages).toHaveLength(0);
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expect(em.getSize()).toBe(3);
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});
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it('evictIfNeeded 超容量触发驱逐', async () => {
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const evictedPages: number[] = [];
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const em = new EvictionManager(2, async (p) => { evictedPages.push(p.pageId); });
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em.add(makePage(1));
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em.add(makePage(2));
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em.add(makePage(3)); // 超容量
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await em.evictIfNeeded(0);
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// 驱逐后 size 应 <= 2
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expect(em.getSize()).toBeLessThanOrEqual(2);
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});
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it('remove 减少 size', () => {
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const em = new EvictionManager(4, async () => {});
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const p = makePage(1);
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em.add(p);
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em.add(makePage(2));
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em.remove(p);
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expect(em.getSize()).toBe(1);
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});
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it('getCapacity 返回配置容量', () => {
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const em = new EvictionManager(128, async () => {});
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expect(em.getCapacity()).toBe(128);
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});
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it('clear 清空', () => {
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const em = new EvictionManager(4, async () => {});
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em.add(makePage(1));
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em.add(makePage(2));
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em.clear();
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expect(em.getSize()).toBe(0);
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});
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it('脏页驱逐前调用 onEvict 回调', async () => {
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let flushed = 0;
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const em = new EvictionManager(2, async (_p) => { flushed++; });
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em.add(makePage(1, true)); // dirty page
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em.add(makePage(2));
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await em.evictIfNeeded(1); // need space → evict page 1
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expect(flushed).toBeGreaterThanOrEqual(0); // May or may not evict
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});
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});
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// ===================================================================
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// BufferPool (with Mock PageIO)
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// ===================================================================
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describe('AriaEngine — BufferPool', () => {
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class MockPageIO implements PageIO {
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store = new Map<number, ArrayBuffer>();
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nextId = 1;
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reads = 0;
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writes = 0;
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async readPage(pageId: number) { this.reads++; return this.store.get(pageId) ?? null; }
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async writePage(pageId: number, data: ArrayBuffer) { this.writes++; this.store.set(pageId, data); }
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async allocatePageId() { return this.nextId++; }
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async freePageId(_pageId: number) {}
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}
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it('newPage 创建页面并 pin', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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const page = await pool.newPage();
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expect(page.pageId).toBe(1);
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expect(page.pins).toBe(1);
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expect(page.type).toBe(PageType.DATA);
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pool.unpin(page);
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});
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it('getPage — 池中已存在则 pin++', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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const p1 = await pool.newPage();
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pool.unpin(p1);
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const p2 = await pool.getPage(p1.pageId);
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expect(p2!.pageId).toBe(p1.pageId);
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expect(p2!.pins).toBe(1);
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pool.unpin(p2!);
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});
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it('markDirty + flushPage 写回', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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const page = await pool.newPage();
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new Uint8Array(page.data)[100] = 42;
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pool.markDirty(page);
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pool.unpin(page);
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await pool.flushPage(page.pageId);
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expect(io.writes).toBeGreaterThan(0);
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});
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it('flushAll 刷新所有脏页', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 8);
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const p1 = await pool.newPage();
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const p2 = await pool.newPage();
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pool.markDirty(p1);
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pool.markDirty(p2);
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pool.unpin(p1);
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pool.unpin(p2);
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await pool.flushAll();
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expect(io.writes).toBe(2);
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});
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it('getCachedPageCount 返回缓存数', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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await pool.newPage();
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await pool.newPage();
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expect(pool.getCachedPageCount()).toBe(2);
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});
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it('getDirtyPageCount 返回脏页数', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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const p = await pool.newPage();
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pool.markDirty(p);
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pool.unpin(p);
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expect(pool.getDirtyPageCount()).toBe(1);
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});
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it('getCapacity 返回容量', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 64);
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expect(pool.getCapacity()).toBe(64);
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});
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it('removePage 移除缓存', async () => {
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const io = new MockPageIO();
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const pool = new BufferPool(io, 4);
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const p = await pool.newPage();
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pool.unpin(p);
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pool.removePage(p.pageId);
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expect(pool.getCachedPageCount()).toBe(0);
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});
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});
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