158 lines
20 KiB
Plaintext
158 lines
20 KiB
Plaintext
export class MemoryCacheItem {
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item;
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expiresAt; // Timestamp in ms
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constructor(item, expiresAt) {
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this.item = item;
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this.expiresAt = expiresAt;
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}
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isExpired(now) {
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return now > this.expiresAt;
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}
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setAccess(now, ttl) {
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this.expiresAt = now + ttl;
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}
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getItem() {
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return this.item;
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}
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done(now) {
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if (this.isExpired(now)) {
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return true;
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}
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return false;
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}
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}
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export class MemoryCache {
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isGathered = new Map();
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references = new Map();
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cache = new Map();
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options;
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logger;
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disposed = false;
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currentSize = 0;
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timer;
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constructor(options, logger) {
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this.options = options;
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this.logger = logger;
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this.resetGlobalTimer();
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}
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add(item, requestItem, testNow) {
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if (this.disposed)
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throw new Error('MemoryCache is disposed');
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this.currentSize += item.size || 0;
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this.cache.set(item.baseId, new MemoryCacheItem(item, (testNow || this.now()) + this.options.ttlms));
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if (!this.isGathered.has(item.baseId)) {
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this.isGathered.set(item.baseId, true);
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this.scanForReferences(item.base, requestItem);
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}
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}
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get(id) {
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if (this.disposed)
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throw new Error('MemoryCache is disposed');
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const item = this.cache.get(id);
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if (item) {
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item.setAccess(this.now(), this.options.ttlms);
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return item.getItem();
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}
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return undefined;
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}
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scanForReferences(data, requestItem) {
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const scan = (item) => {
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// Stop if the item is null or not an object (i.e., primitive)
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if (item === null || typeof item !== 'object') {
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return;
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}
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// If it's an array, scan each element
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if (Array.isArray(item)) {
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for (const element of item) {
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scan(element);
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}
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return;
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}
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// If it's an object, scan its properties
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for (const key in item) {
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if (Object.prototype.hasOwnProperty.call(item, key)) {
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// We found the target property!
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if (key === 'referencedId') {
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const value = item.referencedId;
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// Ensure the value is a string before adding it
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if (typeof value === 'string') {
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this.references.set(value, (this.references.get(value) || 0) + 1);
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if (!this.cache.has(value)) {
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requestItem(value);
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}
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}
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}
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// Continue scanning deeper into the object's properties
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scan(item[key]);
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}
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}
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};
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scan(data);
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}
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resetGlobalTimer() {
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const run = () => {
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this.cleanCache();
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this.timer = setTimeout(run, this.options.ttlms);
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};
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this.timer = setTimeout(run, this.options.ttlms);
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}
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now() {
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return Date.now();
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}
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cleanCache(testNow) {
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const maxSizeBytes = this.options.maxSizeInMb * 1024 * 1024;
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if (this.currentSize < maxSizeBytes) {
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this.logger(`cache size (${this.currentSize} < ${maxSizeBytes}) is ok, no need to clean`);
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return;
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}
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const now = testNow || this.now();
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let cleaned = 0;
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const start = performance.now();
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for (const deferredBase of Array.from(this.cache.values())
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.filter((x) => x.isExpired(now))
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.sort((a, b) => this.compareMaybeBasesByReferences(a.getItem().baseId, b.getItem().baseId))) {
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if (deferredBase.done(now)) {
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const id = deferredBase.getItem().baseId;
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const referenceCount = this.references.get(id) || 0;
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if (referenceCount > 0) {
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// Skip eviction for items with reference counts greater than 0,
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// as they are still in use and should not be removed from the cache.
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continue;
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}
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this.currentSize -= deferredBase.getItem().size || 0;
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this.cache.delete(id);
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cleaned++;
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if (this.currentSize < maxSizeBytes) {
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break;
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}
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}
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}
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this.logger(`cleaned cache: cleaned ${cleaned}, cached ${this.cache.size}, time ${performance.now() - start}`);
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return;
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}
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compareMaybeBasesByReferences(id1, id2) {
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const a = this.references.get(id1);
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const b = this.references.get(id2);
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if (a === undefined && b === undefined)
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return 0;
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if (a === undefined)
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return -1;
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if (b === undefined)
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return 1;
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return a - b;
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}
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dispose() {
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if (this.disposed)
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return;
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this.disposed = true;
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if (this.timer) {
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clearTimeout(this.timer);
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this.timer = undefined;
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}
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this.cache.clear();
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this.isGathered.clear();
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this.references.clear();
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}
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}
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{ CustomLogger } from '../types/functions.js'\r\nimport { Item } from '../types/types.js'\r\n\r\nexport interface MemoryCacheOptions {\r\n  maxSizeInMb: number\r\n  ttlms: number\r\n}\r\n\r\nexport class MemoryCacheItem {\r\n  private item: Item\r\n  private expiresAt: number // Timestamp in ms\r\n\r\n  constructor(item: Item, expiresAt: number) {\r\n    this.item = item\r\n    this.expiresAt = expiresAt\r\n  }\r\n\r\n  isExpired(now: number): boolean {\r\n    return now > this.expiresAt\r\n  }\r\n  setAccess(now: number, ttl: number): void {\r\n    this.expiresAt = now + ttl\r\n  }\r\n\r\n  getItem(): Item {\r\n    return this.item\r\n  }\r\n\r\n  done(now: number): boolean {\r\n    if (this.isExpired(now)) {\r\n      return true\r\n    }\r\n    return false\r\n  }\r\n}\r\n\r\nexport class MemoryCache {\r\n  private isGathered: Map<string, boolean> = new Map()\r\n  private references: Map<string, number> = new Map()\r\n  private cache: Map<string, MemoryCacheItem> = new Map()\r\n\r\n  private options: MemoryCacheOptions\r\n  private logger: CustomLogger\r\n  private disposed = false\r\n  private currentSize = 0\r\n  private timer?: ReturnType<typeof setTimeout>\r\n\r\n  constructor(options: MemoryCacheOptions, logger: CustomLogger) {\r\n    this.options = options\r\n    this.logger = logger\r\n    this.resetGlobalTimer()\r\n  }\r\n\r\n  add(item: Item, requestItem: (id: string) => void, testNow?: number): void {\r\n    if (this.disposed) throw new Error('MemoryCache is disposed')\r\n    this.currentSize += item.size || 0\r\n    this.cache.set(\r\n      item.baseId,\r\n      new MemoryCacheItem(item, (testNow || this.now()) + this.options.ttlms)\r\n    )\r\n\r\n    if (!this.isGathered.has(item.baseId)) {\r\n      this.isGathered.set(item.baseId, true)\r\n      this.scanForReferences(item.base!, requestItem)\r\n    }\r\n  }\r\n\r\n  get(id: string): Item | undefined {\r\n    if (this.disposed) throw new Error('MemoryCache is disposed')\r\n    const item = this.cache.get(id)\r\n    if (item) {\r\n      item.setAccess(this.now(), this.options.ttlms)\r\n      return item.getItem()\r\n    }\r\n    return undefined\r\n  }\r\n\r\n  scanForReferences(data: unknown, requestItem: (id: string) => void): void {\r\n    const scan = (item: unknown): void => {\r\n      // Stop if the item is null or not an object (i.e., primitive)\r\n      if (item === null || typeof item !== 'object') {\r\n        return\r\n      }\r\n\r\n      // If it's an array, scan each element\r\n      if (Array.isArray(item)) {\r\n        for (const element of item) {\r\n          scan(element)\r\n        }\r\n        return\r\n      }\r\n\r\n      // If it's an object, scan its properties\r\n      for (const key in item) {\r\n        if (Object.prototype.hasOwnProperty.call(item, key)) {\r\n          // We found the target property!\r\n          if (key === 'referencedId') {\r\n            const value = (item as { referencedId: unknown }).referencedId\r\n            // Ensure the value is a string before adding it\r\n            if (typeof value === 'string') {\r\n              this.references.set(value, (this.references.get(value) || 0) + 1)\r\n              if (!this.cache.has(value)) {\r\n                requestItem(value)\r\n              }\r\n            }\r\n          }\r\n\r\n          // Continue scanning deeper into the object's properties\r\n          scan((item as Record<string, unknown>)[key])\r\n        }\r\n      }\r\n    }\r\n\r\n    scan(data)\r\n  }\r\n\r\n  private resetGlobalTimer(): void {\r\n    const run = (): void => {\r\n      this.cleanCache()\r\n      this.timer = setTimeout(run, this.options.ttlms)\r\n    }\r\n    this.timer = setTimeout(run, this.options.ttlms)\r\n  }\r\n\r\n  private now(): number {\r\n    return Date.now()\r\n  }\r\n\r\n  cleanCache(testNow?: number): void {\r\n    const maxSizeBytes = this.options.maxSizeInMb * 1024 * 1024\r\n    if (this.currentSize < maxSizeBytes) {\r\n      this.logger(\r\n        `cache size (${this.currentSize} < ${maxSizeBytes}) is ok, no need to clean`\r\n      )\r\n      return\r\n    }\r\n    const now = testNow || this.now()\r\n    let cleaned = 0\r\n    const start = performance.now()\r\n    for (const deferredBase of Array.from(this.cache.values())\r\n      .filter((x) => x.isExpired(now))\r\n      .sort((a, b) =>\r\n        this.compareMaybeBasesByReferences(a.getItem().baseId, b.getItem().baseId)\r\n      )) {\r\n      if (deferredBase.done(now)) {\r\n        const id = deferredBase.getItem().baseId\r\n        const referenceCount = this.references.get(id) || 0\r\n        if (referenceCount > 0) {\r\n          // Skip eviction for items with reference counts greater than 0,\r\n          // as they are still in use and should not be removed from the cache.\r\n          continue\r\n        }\r\n        this.currentSize -= deferredBase.getItem().size || 0\r\n        this.cache.delete(id)\r\n        cleaned++\r\n        if (this.currentSize < maxSizeBytes) {\r\n          break\r\n        }\r\n      }\r\n    }\r\n    this.logger(\r\n      `cleaned cache: cleaned ${cleaned}, cached ${this.cache.size}, time ${\r\n        performance.now() - start\r\n      }`\r\n    )\r\n    return\r\n  }\r\n\r\n  compareMaybeBasesByReferences(id1: string, id2: string): number {\r\n    const a = this.references.get(id1)\r\n    const b = this.references.get(id2)\r\n    if (a === undefined && b === undefined) return 0\r\n    if (a === undefined) return -1\r\n    if (b === undefined) return 1\r\n    return a - b\r\n  }\r\n\r\n  dispose(): void {\r\n    if (this.disposed) return\r\n    this.disposed = true\r\n    if (this.timer) {\r\n      clearTimeout(this.timer)\r\n      this.timer = undefined\r\n    }\r\n    this.cache.clear()\r\n    this.isGathered.clear()\r\n    this.references.clear()\r\n  }\r\n}\r\n"]} |