@tanstack/db/dist/cjs/live-query-window-controller.cjs.map

A reactive client store for building super fast apps on sync

{"version":3,"file":"live-query-window-controller.cjs","sources":["../../src/live-query-window-controller.ts"],"sourcesContent":["import {\n  LiveQueryWindowControllerDisposedError,\n  SetWindowRequiresOrderByError,\n} from './errors.js'\nimport {\n  getLiveQueryStatusFlags,\n  isCollection,\n  isSingleResultCollection,\n} from './live-query-adapter.js'\nimport { createLiveQueryObserver } from './live-query-observer.js'\nimport { BaseQueryBuilder } from './query/builder/index.js'\nimport { deepEquals } from './utils.js'\nimport type {\n  LiveQueryObserver,\n  LiveQuerySnapshot,\n} from './live-query-observer.js'\nimport type { Collection } from './collection/index.js'\nimport type { CollectionStatus } from './types.js'\nimport type {\n  Context,\n  InitialQueryBuilder,\n  QueryBuilder,\n} from './query/builder/index.js'\n\nconst DEFAULT_PAGE_SIZE = 20\n\nexport type LiveQueryWindowInputKind = `collection` | `query`\n\n/** @internal The supported, enabled input forms for infinite-query adapters. */\nexport type ResolvedLiveQueryWindowInput<TContext extends Context> =\n  | { kind: `collection`; collection: Collection<any, any, any> }\n  | { kind: `query`; query: QueryBuilder<TContext> }\n\n/**\n * Classify an infinite-query input without invoking its query callback.\n * Frameworks use this during lifecycle comparison so unchanged React renders\n * do not execute the callback again.\n *\n * @internal This contract is unstable while RFC #1623 is being implemented.\n */\nexport function getLiveQueryWindowInputKind(\n  input: unknown,\n): LiveQueryWindowInputKind {\n  if (isCollection(input)) return `collection`\n  if (typeof input === `function`) return `query`\n  throw new Error(\n    `useLiveInfiniteQuery: First argument must be either a pre-created live query collection or a query function. ` +\n      `Received: ${typeof input}`,\n  )\n}\n\n/**\n * Resolve a supported infinite-query input and invoke a query callback once.\n * A function may resolve to a collection for framework getter compatibility.\n * Nullable/disabled and config-object inputs are intentionally not supported.\n *\n * @internal This contract is unstable while RFC #1623 is being implemented.\n */\nexport function resolveLiveQueryWindowInput<TContext extends Context>(\n  input: unknown,\n): ResolvedLiveQueryWindowInput<TContext> {\n  if (getLiveQueryWindowInputKind(input) === `collection`) {\n    return {\n      kind: `collection`,\n      collection: input as Collection<any, any, any>,\n    }\n  }\n\n  const value = (\n    input as (q: InitialQueryBuilder) => QueryBuilder<TContext> | unknown\n  )(new BaseQueryBuilder() as InitialQueryBuilder)\n  if (isCollection(value)) {\n    return { kind: `collection`, collection: value }\n  }\n  if (\n    typeof value !== `object` ||\n    value === null ||\n    typeof (value as { limit?: unknown }).limit !== `function` ||\n    typeof (value as { offset?: unknown }).offset !== `function`\n  ) {\n    throw new Error(\n      `useLiveInfiniteQuery: Query function must return a query builder. ` +\n        `Disabled null or undefined queries are not supported.`,\n    )\n  }\n  return { kind: `query`, query: value as QueryBuilder<TContext> }\n}\n\n/** @internal This contract is unstable while RFC #1623 is being implemented. */\nexport function normalizeLiveQueryWindowPageSize(\n  pageSize: number | undefined,\n): number {\n  if (\n    pageSize === undefined ||\n    !Number.isSafeInteger(pageSize) ||\n    pageSize <= 0 ||\n    pageSize >= Number.MAX_SAFE_INTEGER\n  ) {\n    return DEFAULT_PAGE_SIZE\n  }\n  return pageSize\n}\n\ntype WindowResult = true | Promise<void>\n\ntype LiveQueryWindow = { offset: number; limit: number }\n\n/** @internal Shared adapter view of a collection with an ordered window. */\nexport type LiveQueryWindowCollection = Collection<any, any, any> & {\n  utils: {\n    setWindow: (options: LiveQueryWindow) => WindowResult\n    getWindow: () => LiveQueryWindow | undefined\n  }\n}\n\ntype WindowTarget = object & {\n  utils?: {\n    setWindow?: (options: { offset: number; limit: number }) => WindowResult\n    getWindow?: () => { offset: number; limit: number } | undefined\n  }\n}\n\ntype PendingWindow = {\n  generation: number\n  limit: number\n  promise: Promise<void>\n}\n\nclass WindowCoordinator {\n  private readonly leases = new Map<symbol, number>()\n  private readonly leaseVersions = new Map<symbol, number>()\n  private baselineWindow: { offset: number; limit: number } | undefined\n  private retainedWindow: { offset: number; limit: number } | undefined\n  private shouldCaptureBaseline = true\n  private appliedLimit: number | undefined\n  private pending: PendingWindow | undefined\n  private generation = 0\n  private leaseVersion = 0\n\n  constructor(private readonly target: WindowTarget) {}\n\n  request(lease: symbol, limit: number): WindowResult {\n    if (this.leases.size === 0) {\n      const currentWindow = this.target.utils?.getWindow?.()\n      const retainedWindowChanged =\n        this.retainedWindow !== undefined &&\n        (currentWindow?.offset !== this.retainedWindow.offset ||\n          currentWindow.limit !== this.retainedWindow.limit)\n      if (this.shouldCaptureBaseline || retainedWindowChanged) {\n        this.baselineWindow = currentWindow\n        this.shouldCaptureBaseline = false\n      }\n      this.retainedWindow = undefined\n    }\n    const previousLimit = this.leases.get(lease)\n    const previousVersion = this.leaseVersions.get(lease)\n    const version = ++this.leaseVersion\n    this.leases.set(lease, limit)\n    this.leaseVersions.set(lease, version)\n\n    let result: WindowResult\n    try {\n      result = this.applyDesiredWindow()\n    } catch (error) {\n      this.rollbackLease(lease, version, previousLimit, previousVersion)\n      this.appliedLimit = undefined\n      if (this.leases.size === 0) this.shouldCaptureBaseline = true\n      throw error\n    }\n\n    if (result === true) return true\n    return result.catch(async (error: unknown) => {\n      if (this.rollbackLease(lease, version, previousLimit, previousVersion)) {\n        this.generation++\n        this.pending = undefined\n        this.appliedLimit = undefined\n        try {\n          if (this.leases.size === 0) {\n            this.restoreInitialWindow()\n          } else {\n            const rollback = this.applyDesiredWindow()\n            if (rollback !== true) await rollback\n          }\n        } catch {\n          // Preserve the failure from the requested window.\n        }\n      }\n      throw error\n    })\n  }\n\n  getLeaseResult(lease: symbol, minimumLimit: number): WindowResult | false {\n    const limit = this.leases.get(lease)\n    if (limit === undefined || limit < minimumLimit) return false\n    const desiredLimit = this.getDesiredLimit()\n    // getWindow reports settled state; the current lease may still be loading.\n    if (this.pending && this.pending.limit === desiredLimit)\n      return this.pending.promise\n    const currentWindow = this.target.utils?.getWindow?.()\n    return (\n      currentWindow === undefined ||\n      (currentWindow.offset === 0 && currentWindow.limit === desiredLimit)\n    )\n  }\n\n  hasLeases(): boolean {\n    return this.leases.size > 0\n  }\n\n  release(lease: symbol, restoreWhenEmpty: boolean): void {\n    if (!this.leases.delete(lease)) return\n    this.leaseVersions.delete(lease)\n\n    // A pending request may still mutate the physical operator, but it no longer\n    // establishes the accepted window for the remaining lease set.\n    this.generation++\n    this.pending = undefined\n    this.appliedLimit = undefined\n\n    if (this.leases.size === 0) {\n      if (restoreWhenEmpty) {\n        this.restoreInitialWindow()\n      } else {\n        this.retainedWindow = this.target.utils?.getWindow?.()\n      }\n      return\n    }\n\n    try {\n      const result = this.applyDesiredWindow()\n      if (result !== true) {\n        void result.catch(() => {\n          // Unsubscribe has no async error channel. Leave the physical window\n          // unaccepted so the next request retries it.\n          this.appliedLimit = undefined\n        })\n      }\n    } catch {\n      // The remaining controller will retry on its next request.\n      this.appliedLimit = undefined\n    }\n  }\n\n  private getDesiredLimit(): number | undefined {\n    let desired: number | undefined\n    for (const limit of this.leases.values()) {\n      desired = desired === undefined ? limit : Math.max(desired, limit)\n    }\n    return desired\n  }\n\n  private rollbackLease(\n    lease: symbol,\n    version: number,\n    previousLimit: number | undefined,\n    previousVersion: number | undefined,\n  ): boolean {\n    if (this.leaseVersions.get(lease) !== version) return false\n    if (previousLimit === undefined) {\n      this.leases.delete(lease)\n      this.leaseVersions.delete(lease)\n    } else {\n      this.leases.set(lease, previousLimit)\n      if (previousVersion === undefined) {\n        this.leaseVersions.delete(lease)\n      } else {\n        this.leaseVersions.set(lease, previousVersion)\n      }\n    }\n    return true\n  }\n\n  private restoreInitialWindow(): void {\n    const setWindow = this.target.utils?.setWindow\n    const baselineWindow = this.baselineWindow\n    this.retainedWindow = undefined\n    this.shouldCaptureBaseline = false\n    if (!baselineWindow || typeof setWindow !== `function`) {\n      this.shouldCaptureBaseline = true\n      return\n    }\n    const generation = this.generation\n    const markRestored = () => {\n      if (generation === this.generation && this.leases.size === 0) {\n        this.shouldCaptureBaseline = true\n      }\n    }\n    try {\n      const result = setWindow.call(this.target.utils, baselineWindow)\n      if (result === true) {\n        markRestored()\n      } else {\n        void result.then(markRestored, () => {\n          // Keep the original baseline so a later release can retry it.\n        })\n      }\n    } catch {\n      // Release has no error channel. Keep the baseline for a later retry.\n    }\n  }\n\n  private applyDesiredWindow(): WindowResult {\n    const limit = this.getDesiredLimit()\n    if (limit === undefined) return true\n    if (this.pending?.limit === limit) return this.pending.promise\n    if (this.pending) {\n      // `setWindow` mutates the physical operator before its load promise\n      // settles. A different desired window must therefore be applied again,\n      // even when it matches the last settled limit.\n      this.generation++\n      this.pending = undefined\n      this.appliedLimit = undefined\n    }\n    const currentWindow = this.target.utils?.getWindow?.()\n    if (\n      limit === this.appliedLimit &&\n      currentWindow?.offset === 0 &&\n      currentWindow.limit === limit\n    ) {\n      return true\n    }\n\n    const setWindow = this.target.utils?.setWindow\n    if (typeof setWindow !== `function`) {\n      throw new SetWindowRequiresOrderByError()\n    }\n\n    const generation = ++this.generation\n    const result = setWindow.call(this.target.utils, { offset: 0, limit })\n    if (result === true) {\n      if (generation === this.generation && this.getDesiredLimit() === limit) {\n        this.appliedLimit = limit\n      }\n      return true\n    }\n\n    const promise = result.then(\n      () => {\n        if (\n          generation === this.generation &&\n          this.getDesiredLimit() === limit\n        ) {\n          this.appliedLimit = limit\n        }\n        if (this.pending?.generation === generation) {\n          this.pending = undefined\n        }\n      },\n      (error: unknown) => {\n        if (this.pending?.generation === generation) {\n          this.pending = undefined\n        }\n        throw error\n      },\n    )\n    this.pending = { generation, limit, promise }\n    return promise\n  }\n}\n\nconst windowCoordinators = new WeakMap<object, WindowCoordinator>()\n\nfunction getWindowCoordinator(target: WindowTarget): WindowCoordinator {\n  let coordinator = windowCoordinators.get(target)\n  if (!coordinator) {\n    coordinator = new WindowCoordinator(target)\n    windowCoordinators.set(target, coordinator)\n  }\n  return coordinator\n}\n\n/** @internal Whether an infinite-query controller currently owns this window. */\nexport function hasLiveQueryWindowLeases(target: object): boolean {\n  return windowCoordinators.get(target)?.hasLeases() ?? false\n}\n\n/** @internal Shared validation for infinite-query adapters. */\nexport function assertLiveQueryWindowManyResult(\n  collection: Collection<any, any, any>,\n): void {\n  if (isSingleResultCollection(collection)) {\n    throw new Error(\n      `useLiveInfiniteQuery: Infinite queries do not support single-result queries. Remove .findOne().`,\n    )\n  }\n}\n\n/** @internal Whether a collection exposes an active ordered window. */\nexport function isLiveQueryWindowCollection(\n  collection: Collection<any, any, any>,\n): collection is LiveQueryWindowCollection {\n  return (\n    typeof collection.utils?.setWindow === `function` &&\n    collection.utils.getWindow?.() !== undefined\n  )\n}\n\n/**\n * Validate a pre-created infinite-query collection and describe any window\n * adjustment the adapter should warn about.\n *\n * @internal Shared validation for infinite-query adapters.\n */\nexport function getLiveQueryWindowCollectionWarning(\n  collection: Collection<any, any, any>,\n  expectedLimit: number,\n): string | undefined {\n  assertLiveQueryWindowManyResult(collection)\n  if (!isLiveQueryWindowCollection(collection)) {\n    throw new Error(\n      `useLiveInfiniteQuery: Pre-created live query collection must have an ORDER BY (orderBy) clause for infinite pagination to work. ` +\n        `Please add .orderBy() to your createLiveQueryCollection query.`,\n    )\n  }\n\n  const currentWindow = collection.utils.getWindow()\n  if (\n    !currentWindow ||\n    hasLiveQueryWindowLeases(collection) ||\n    (currentWindow.offset === 0 && currentWindow.limit === expectedLimit)\n  ) {\n    return undefined\n  }\n\n  return (\n    `useLiveInfiniteQuery: Pre-created collection has window {offset: ${currentWindow.offset}, limit: ${currentWindow.limit}} ` +\n    `but the hook expects {offset: 0, limit: ${expectedLimit}}. Adjusting window now.`\n  )\n}\n\n/** @internal Compare adapter dependencies by identity and structure. */\nexport function compareLiveQueryWindowDependencies(\n  previous: ReadonlyArray<unknown> | null | undefined,\n  current: ReadonlyArray<unknown>,\n): { changed: boolean; structurallyEqual: boolean } {\n  const changed =\n    previous === null ||\n    previous === undefined ||\n    previous.length !== current.length ||\n    previous.some((dependency, index) => dependency !== current[index])\n  return {\n    changed,\n    structurallyEqual:\n      previous !== null &&\n      previous !== undefined &&\n      deepEquals(previous, current),\n  }\n}\n\n/** @internal Shared page-depth preservation policy for framework adapters. */\nexport function shouldPreserveLiveQueryWindowPageCount(options: {\n  hasPreviousController: boolean\n  previousInputKind: `collection` | `query` | undefined\n  inputKind: `collection` | `query`\n  sameCollection: boolean\n  dependenciesChanged: boolean\n  dependenciesStructurallyEqual: boolean\n  pageShapeChanged: boolean\n}): boolean {\n  if (\n    !options.hasPreviousController ||\n    options.previousInputKind !== options.inputKind\n  ) {\n    return false\n  }\n  if (options.inputKind === `collection`) return options.sameCollection\n  return options.dependenciesChanged\n    ? options.dependenciesStructurallyEqual\n    : options.pageShapeChanged\n}\n\n/**\n * A page-windowed view of a live query at a point in time.\n *\n * @internal This contract is unstable while RFC #1623 is being implemented.\n */\nexport interface LiveQueryWindowSnapshot<\n  T extends object,\n  TKey extends string | number,\n> {\n  /** Rows across all committed pages, with the peek-ahead row removed. */\n  data: ReadonlyArray<T>\n  /** Rows grouped into committed pages of `pageSize`. */\n  pages: ReadonlyArray<ReadonlyArray<T>>\n  /** `initialPageParam + i` for each committed page. */\n  pageParams: ReadonlyArray<number>\n  hasNextPage: boolean\n  isFetchingNextPage: boolean\n  /** Last pagination failure, retained through an earlier-started success until recovery begins. */\n  error: unknown\n  /** Keyed results for the physical window, or `undefined` when disabled. */\n  state: ReadonlyMap<TKey, T> | undefined\n  collection: Collection<T, TKey, any> | undefined\n  status: CollectionStatus | `disabled`\n  isLoading: boolean\n  isReady: boolean\n  persistedStatus: LiveQuerySnapshot<T, TKey>[`persistedStatus`]\n  isPersistedReady: boolean\n  persistedError: unknown | undefined\n  isIdle: boolean\n  isError: boolean\n  isCleanedUp: boolean\n  isEnabled: boolean\n}\n\n/** @internal This contract is unstable while RFC #1623 is being implemented. */\nexport interface CreateLiveQueryWindowControllerOptions {\n  /** Rows per page (default 20). Invalid values use the default. */\n  pageSize?: number\n  /** Value of the first page's `pageParam` (default 0). */\n  initialPageParam?: number\n  /** Committed pages to preserve when a framework binding changes page shape. */\n  initialPageCount?: number\n}\n\n/** @internal This contract is unstable while RFC #1623 is being implemented. */\nexport interface LiveQueryWindowController<\n  T extends object,\n  TKey extends string | number,\n> {\n  getSnapshot: () => LiveQueryWindowSnapshot<T, TKey>\n  subscribe: (listener: () => void) => () => void\n  /** Load one more page, resolving only after that page is committed. */\n  fetchNextPage: () => Promise<void>\n  /** Reset to the first page, resolving after the smaller window is accepted. */\n  reset: () => Promise<void>\n  preload: () => Promise<void>\n  dispose: () => void\n}\n\n/**\n * Run an adapter-facing page fetch. The controller records failures in its\n * snapshot; consuming the rejection here keeps event handlers safe while the\n * returned promise still settles with the request.\n *\n * @internal This contract is unstable while RFC #1623 is being implemented.\n */\nexport function fetchNextLiveQueryWindowPage(\n  controller: Pick<\n    LiveQueryWindowController<object, string | number>,\n    `fetchNextPage`\n  >,\n): Promise<void> {\n  return controller.fetchNextPage().catch(() => {})\n}\n\ninterface CachedFrom {\n  observerSnapshot: unknown\n  committedPageCount: number\n  isFetchingNextPage: boolean\n  hasPaginationError: boolean\n  paginationError: unknown\n  failedHasNextPage: boolean\n}\n\ninterface SubscriptionRecord {\n  listener: () => void\n  active: boolean\n}\n\ninterface Publication {\n  targets: Array<SubscriptionRecord>\n}\n\nclass LiveQueryWindowControllerImpl<\n  T extends object,\n  TKey extends string | number,\n> implements LiveQueryWindowController<T, TKey> {\n  private readonly observer: LiveQueryObserver<T, TKey>\n  private readonly collection: Collection<T, TKey, any> | null\n  private readonly coordinator: WindowCoordinator | null\n  private readonly lease = Symbol(`liveQueryWindowLease`)\n  private readonly pageSize: number\n  private readonly initialPageParam: number\n\n  private committedPageCount: number\n  private isFetchingNextPage = false\n  private hasPaginationError = false\n  private paginationError: unknown\n  private failedHasNextPage = false\n  private activeFetchPromise: Promise<void> | null = null\n  private windowGeneration = 0\n  private pendingWindowGeneration: number | undefined\n  private leaseActive = false\n  private leaseGeneration = 0\n  private inFlightLeaseHolders = 0\n  private restoreInitialWindowOnRelease = false\n\n  private readonly subscriptions = new Set<SubscriptionRecord>()\n  private readonly publicationQueue: Array<Publication> = []\n  private dispatching = false\n  private blockDelivery = false\n  private transitionDepth = 0\n  private transitionNeedsNotify = false\n  private observerUnsub: (() => void) | null = null\n  private cachedSnapshot: LiveQueryWindowSnapshot<T, TKey> | null = null\n  private cachedFrom: CachedFrom | null = null\n  private disposed = false\n\n  constructor(\n    collection: Collection<T, TKey, any> | null,\n    options: CreateLiveQueryWindowControllerOptions,\n  ) {\n    this.collection = collection\n    this.coordinator = collection\n      ? getWindowCoordinator(collection as unknown as WindowTarget)\n      : null\n    this.pageSize = normalizeLiveQueryWindowPageSize(options.pageSize)\n    this.initialPageParam = options.initialPageParam ?? 0\n    const initialPageCount = Math.floor(options.initialPageCount ?? 1)\n    this.committedPageCount = Number.isFinite(initialPageCount)\n      ? Math.max(1, initialPageCount)\n      : 1\n    // The controller listener carries no delta payload, so wholesale is the\n    // only coherent observer contract and guarantees non-reentrant subscribe.\n    this.observer = createLiveQueryObserver<T, TKey>(collection, {\n      mode: `wholesale`,\n    })\n  }\n\n  getSnapshot(): LiveQueryWindowSnapshot<T, TKey> {\n    const observerSnapshot = this.observer.getSnapshot()\n    if (this.hasPaginationError && observerSnapshot.status === `ready`) {\n      this.failedHasNextPage = this.getComputedHasNextPage(observerSnapshot)\n    }\n    const cached = this.cachedSnapshot\n    if (\n      cached &&\n      this.cachedFrom &&\n      this.cachedFrom.observerSnapshot === observerSnapshot &&\n      this.cachedFrom.committedPageCount === this.committedPageCount &&\n      this.cachedFrom.isFetchingNextPage === this.isFetchingNextPage &&\n      this.cachedFrom.hasPaginationError === this.hasPaginationError &&\n      this.cachedFrom.paginationError === this.paginationError &&\n      this.cachedFrom.failedHasNextPage === this.failedHasNextPage\n    ) {\n      return cached\n    }\n\n    const enabled = observerSnapshot.isEnabled\n    const rows =\n      enabled && Array.isArray(observerSnapshot.data)\n        ? (observerSnapshot.data as ReadonlyArray<T>)\n        : []\n    const totalRequested = this.committedPageCount * this.pageSize\n    const computedHasNextPage = enabled && rows.length > totalRequested\n    const hasNextPage = this.hasPaginationError\n      ? this.failedHasNextPage\n      : computedHasNextPage\n\n    const pageCount = enabled ? this.committedPageCount : 0\n    const pages: Array<ReadonlyArray<T>> = []\n    const pageParams: Array<number> = []\n    for (let i = 0; i < pageCount; i++) {\n      pages.push(rows.slice(i * this.pageSize, (i + 1) * this.pageSize))\n      pageParams.push(this.initialPageParam + i)\n    }\n\n    const status = this.hasPaginationError ? `error` : observerSnapshot.status\n    const statusFlags = this.hasPaginationError\n      ? getLiveQueryStatusFlags(`error`)\n      : observerSnapshot\n    this.cachedSnapshot = {\n      data: rows.slice(0, totalRequested),\n      pages,\n      pageParams,\n      hasNextPage,\n      isFetchingNextPage: this.isFetchingNextPage,\n      error: this.hasPaginationError ? this.paginationError : undefined,\n      state: observerSnapshot.state,\n      collection: observerSnapshot.collection,\n      status,\n      isLoading: statusFlags.isLoading,\n      isReady: statusFlags.isReady,\n      persistedStatus: observerSnapshot.persistedStatus,\n      isPersistedReady: observerSnapshot.isPersistedReady,\n      persistedError: observerSnapshot.persistedError,\n      isIdle: statusFlags.isIdle,\n      isError: statusFlags.isError,\n      isCleanedUp: observerSnapshot.isCleanedUp,\n      isEnabled: observerSnapshot.isEnabled,\n    }\n    this.cachedFrom = {\n      observerSnapshot,\n      committedPageCount: this.committedPageCount,\n      isFetchingNextPage: this.isFetchingNextPage,\n      hasPaginationError: this.hasPaginationError,\n      paginationError: this.paginationError,\n      failedHasNextPage: this.failedHasNextPage,\n    }\n    return this.cachedSnapshot\n  }\n\n  subscribe(listener: () => void): () => void {\n    if (this.disposed) throw new LiveQueryWindowControllerDisposedError()\n\n    const record: SubscriptionRecord = { listener, active: true }\n    this.subscriptions.add(record)\n    if (this.subscriptions.size === 1) {\n      this.restoreInitialWindowOnRelease = false\n      this.blockDelivery = true\n      let observerUnsub: (() => void) | null = null\n      try {\n        // Store the desired physical window before observer activation can\n        // compile or restart the live-query pipeline.\n        const windowResult = this.ensureLeaseActive(this.committedPageCount)\n        const leaseGeneration = this.leaseGeneration\n        observerUnsub = this.observer.subscribe(() => this.notify())\n        this.observerUnsub = observerUnsub\n        if (windowResult !== true) {\n          this.trackAttachmentFailure(windowResult, leaseGeneration)\n        }\n      } catch (error) {\n        observerUnsub?.()\n        this.observerUnsub = null\n        this.deactivateLease(true)\n        record.active = false\n        this.subscriptions.delete(record)\n        throw error\n      } finally {\n        this.blockDelivery = false\n      }\n    }\n\n    return () => {\n      if (!record.active) return\n      record.active = false\n      this.subscriptions.delete(record)\n      if (this.subscriptions.size === 0) {\n        this.restoreInitialWindowOnRelease = true\n        this.observerUnsub?.()\n        this.observerUnsub = null\n        if (this.inFlightLeaseHolders === 0) this.deactivateLease(true)\n      }\n    }\n  }\n\n  fetchNextPage(): Promise<void> {\n    if (this.disposed) return Promise.resolve()\n    if (this.activeFetchPromise) {\n      return this.activeFetchPromise\n    }\n    const snapshot = this.getSnapshot()\n    const awaitingInitialLoad = snapshot.isLoading || snapshot.isIdle\n    if (!snapshot.hasNextPage && !awaitingInitialLoad) return Promise.resolve()\n\n    let resolveFetch!: () => void\n    let rejectFetch!: (error: unknown) => void\n    const activeFetchPromise = new Promise<void>((resolve, reject) => {\n      resolveFetch = resolve\n      rejectFetch = reject\n    })\n    this.activeFetchPromise = activeFetchPromise\n\n    let request: Promise<void>\n    try {\n      const generation = this.windowGeneration\n      // An unpublished initial snapshot cannot establish that there is no next\n      // page. Keep one fetch pending, then decide from the settled first page.\n      request = awaitingInitialLoad\n        ? this.preload().then(() => {\n            if (\n              this.disposed ||\n              generation !== this.windowGeneration ||\n              !this.getSnapshot().hasNextPage\n            ) {\n              return\n            }\n            return this.requestPageCount(this.committedPageCount + 1, true)\n          })\n        : this.requestPageCount(this.committedPageCount + 1, true)\n    } catch (error) {\n      this.activeFetchPromise = null\n      rejectFetch(error)\n      return activeFetchPromise\n    }\n    void request.then(\n      () => {\n        if (this.activeFetchPromise === activeFetchPromise) {\n          this.activeFetchPromise = null\n        }\n        resolveFetch()\n      },\n      (error: unknown) => {\n        if (this.activeFetchPromise === activeFetchPromise) {\n          this.activeFetchPromise = null\n        }\n        rejectFetch(error)\n      },\n    )\n    return activeFetchPromise\n  }\n\n  reset(): Promise<void> {\n    if (this.disposed) return Promise.resolve()\n    if (\n      this.committedPageCount === 1 &&\n      !this.hasPaginationError &&\n      !this.isFetchingNextPage &&\n      !this.activeFetchPromise &&\n      this.pendingWindowGeneration === undefined\n    ) {\n      return Promise.resolve()\n    }\n    this.activeFetchPromise = null\n    return this.requestPageCount(1, false)\n  }\n\n  async preload(): Promise<void> {\n    if (this.disposed) throw new LiveQueryWindowControllerDisposedError()\n\n    const hadPaginationError = this.hasPaginationError\n    this.hasPaginationError = false\n    this.paginationError = undefined\n    this.acquireInFlightLease()\n    try {\n      const result = this.ensureLeaseActive(this.committedPageCount)\n      if (result !== true) await result\n      await this.observer.preload()\n      this.failedHasNextPage = false\n      if (hadPaginationError) this.notify()\n    } catch (error) {\n      this.hasPaginationError = true\n      this.paginationError = error\n      this.failedHasNextPage = this.getComputedHasNextPage()\n      this.notify()\n      throw error\n    } finally {\n      this.releaseInFlightLease()\n    }\n  }\n\n  dispose(): void {\n    if (this.disposed) return\n    this.disposed = true\n    this.windowGeneration++\n    this.pendingWindowGeneration = undefined\n    this.observerUnsub?.()\n    this.observerUnsub = null\n    this.deactivateLease(true)\n    this.observer.dispose()\n    for (const record of this.subscriptions) record.active = false\n    this.subscriptions.clear()\n    this.publicationQueue.length = 0\n  }\n\n  private requestPageCount(\n    requestedPageCount: number,\n    fetchingNextPage: boolean,\n  ): Promise<void> {\n    const generation = ++this.windowGeneration\n    const previousHasNextPage = this.getSnapshot().hasNextPage\n    this.pendingWindowGeneration = undefined\n    this.acquireInFlightLease()\n\n    this.beginTransition()\n    this.isFetchingNextPage = fetchingNextPage\n    this.hasPaginationError = false\n    this.paginationError = undefined\n    if (fetchingNextPage) this.notify()\n\n    let result: WindowResult\n    try {\n      result = this.activateLease(requestedPageCount)\n    } catch (error) {\n      this.isFetchingNextPage = false\n      this.hasPaginationError = true\n      this.paginationError = error\n      this.failedHasNextPage = previousHasNextPage\n      this.notify()\n      this.endTransition()\n      this.releaseInFlightLease()\n      return Promise.reject(error)\n    }\n\n    if (result === true) {\n      if (!this.disposed && generation === this.windowGeneration) {\n        this.committedPageCount = requestedPageCount\n        this.isFetchingNextPage = false\n        this.notify()\n      }\n      this.endTransition()\n      this.releaseInFlightLease()\n      return Promise.resolve()\n    }\n\n    this.pendingWindowGeneration = generation\n    this.endTransition()\n\n    return result\n      .then(\n        () => {\n          if (this.disposed || generation !== this.windowGeneration) return\n          this.beginTransition()\n          this.pendingWindowGeneration = undefined\n          this.committedPageCount = requestedPageCount\n          this.isFetchingNextPage = false\n          this.failedHasNextPage = this.getComputedHasNextPage()\n          this.notify()\n          this.endTransition()\n        },\n        (error: unknown) => {\n          if (!this.disposed && generation === this.windowGeneration) {\n            this.beginTransition()\n            this.pendingWindowGeneration = undefined\n            this.isFetchingNextPage = false\n            this.hasPaginationError = true\n            this.paginationError = error\n            this.failedHasNextPage = previousHasNextPage\n            this.notify()\n            this.endTransition()\n          }\n          throw error\n        },\n      )\n      .finally(() => {\n        this.releaseInFlightLease()\n      })\n  }\n\n  private acquireInFlightLease(): void {\n    this.inFlightLeaseHolders++\n  }\n\n  private releaseInFlightLease(): void {\n    this.inFlightLeaseHolders--\n    if (this.inFlightLeaseHolders === 0 && this.subscriptions.size === 0) {\n      this.deactivateLease(this.restoreInitialWindowOnRelease)\n    }\n  }\n\n  private activateLease(pageCount: number): WindowResult {\n    this.leaseGeneration++\n    if (!this.coordinator || !this.collection) return true\n    this.leaseActive = true\n    return this.coordinator.request(this.lease, pageCount * this.pageSize + 1)\n  }\n\n  private ensureLeaseActive(pageCount: number): WindowResult {\n    const minimumLimit = pageCount * this.pageSize + 1\n    if (this.leaseActive) {\n      const result = this.coordinator?.getLeaseResult(this.lease, minimumLimit)\n      if (result) return result\n    }\n    return this.activateLease(pageCount)\n  }\n\n  private deactivateLease(restoreWhenEmpty = false): void {\n    if (!this.leaseActive || !this.coordinator) return\n    this.leaseGeneration++\n    this.leaseActive = false\n    this.restoreInitialWindowOnRelease = false\n    this.coordinator.release(this.lease, restoreWhenEmpty)\n  }\n\n  private trackAttachmentFailure(\n    result: Promise<void>,\n    leaseGeneration: number,\n  ): void {\n    void result.catch((error: unknown) => {\n      if (\n        this.disposed ||\n        !this.leaseActive ||\n        leaseGeneration !== this.leaseGeneration\n      ) {\n        return\n      }\n      this.beginTransition()\n      this.hasPaginationError = true\n      this.paginationError = error\n      this.failedHasNextPage = this.getComputedHasNextPage()\n      this.notify()\n      this.endTransition()\n    })\n  }\n\n  private getComputedHasNextPage(\n    snapshot: LiveQuerySnapshot<T, TKey> = this.observer.getSnapshot(),\n  ): boolean {\n    return (\n      snapshot.isEnabled &&\n      Array.isArray(snapshot.data) &&\n      snapshot.data.length > this.committedPageCount * this.pageSize\n    )\n  }\n\n  private beginTransition(): void {\n    this.transitionDepth++\n  }\n\n  private endTransition(): void {\n    this.transitionDepth--\n    if (this.transitionDepth === 0 && this.transitionNeedsNotify) {\n      this.transitionNeedsNotify = false\n      this.publish()\n    }\n  }\n\n  private notify(): void {\n    if (this.transitionDepth > 0) {\n      this.transitionNeedsNotify = true\n      return\n    }\n    this.publish()\n  }\n\n  private publish(): void {\n    if (this.disposed || this.blockDelivery || this.subscriptions.size === 0) {\n      return\n    }\n\n    this.publicationQueue.push({ targets: [...this.subscriptions] })\n    if (this.dispatching) return\n\n    this.dispatching = true\n    try {\n      while (this.publicationQueue.length > 0) {\n        const publication = this.publicationQueue.shift()!\n        for (const record of publication.targets) {\n          if (this.hasBeenDisposed()) 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