shenandshen
d20196ee34
1. Configurable chapter window size (onDemandChapterWindowSize: 3-15) - Parameterized window radius in RDEPUBChapterRuntimeStore - Updated RDEPUBChapterWindowCoordinator to use configurable radius - RDEPUBChapterWindowSnapshot.from() accepts chapter array instead of fixed prev/next - Even numbers round up to odd (4→5), min 3, max 15 2. Configurable metadata parsing concurrency (metadataParsingConcurrency) - Default equals CPU core count - Parallel execution via OperationQueue in paginateMetadataOnly - Each worker creates independent builder instance - NSLock protects result aggregation 3. Per-chapter and total wall-clock timing instrumentation - Separated render vs I/O timing per chapter - Summary log with wallClockMs, renderTotalMs, writeTotalMs, avgRenderMs - Timing stored in RDEPUBReaderContext for test access 4. UI automation test infrastructure - Added --demo-window-size, --demo-concurrency, --demo-clear-cache launch args - DemoReaderState exposes windowSize, parseMs, parseConcurrency - ConfigurableWindowTests: 5 test cases for window size 3/5/15 - ConcurrentParsingTests: 4 test cases for concurrency 2/4 - MetadataParseBenchmarkTests: serial vs parallel benchmark 5. Bug fixes - Fixed page snap-back during background parsing (isUserInteracting check) - Reduced BookPageMap refresh frequency from 16 to 32 chapters - Moved waitForReadingInteractionToSettle outside operation loop 6. Design doc: dual-layer PageMap (estimated + precise mixed)
608 lines
27 KiB
Swift
608 lines
27 KiB
Swift
import Foundation
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/// EPUB 阅读器分页协调器：负责出版物的分页计算和页面数据更新。
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///
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/// 职责：
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/// - 根据出版物类型（文本重排/Fixed Layout/Web 内容）选择分页策略
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/// - 文本大书优先恢复分页摘要并切换到按需加载
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/// - 重新分页时保持当前阅读位置
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/// - 刷新可见内容并保持位置
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/// - 重建外部纯文本图书
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final class RDEPUBReaderPaginationCoordinator {
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private let backgroundInteractionCooldown: CFAbsoluteTime = 0.8
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private unowned let context: RDEPUBReaderContext
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init(context: RDEPUBReaderContext) {
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self.context = context
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}
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/// 对出版物执行分页：文本重排优先走摘要恢复/按需加载，Fixed Layout 直接生成快照，Web 内容走 Paginator。
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func paginatePublication(restoreLocation: RDEPUBLocation?) {
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guard let controller = context.controller,
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let parser = context.parser,
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let publication = context.publication,
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let readingSession = context.readingSession else {
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return
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}
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controller.isRepaginating = true
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controller.errorLabel.isHidden = true
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controller.showLoading()
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let token = UUID()
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context.paginationToken = token
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print("[EPUB][Pagination] profile=\(publication.readingProfile.rawValue) layout=\(publication.layout.rawValue) spine=\(publication.spine.count)")
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if publication.readingProfile == .textReflowable {
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print("[EPUB][Pagination] path=text-reflowable-on-demand")
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paginateTextPublication(
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parser: parser,
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publication: publication,
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readingSession: readingSession,
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restoreLocation: restoreLocation,
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token: token
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)
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return
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}
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if publication.layout == .fixed {
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print("[EPUB][Pagination] path=fixed-layout")
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let snapshot = readingSession.makePaginationSnapshot(
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pageCounts: Array(repeating: 1, count: publication.spine.count),
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preferences: controller.currentPreferences(),
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layoutContext: controller.currentLayoutContext()
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)
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context.runtime?.applyPaginationSnapshot(snapshot, restoreLocation: restoreLocation)
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return
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}
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let paginator = context.makePaginator()
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print("[EPUB][Pagination] path=web-paginator")
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context.paginator = paginator
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paginator.calculate(
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parser: parser,
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hostingView: controller.ensurePaginationHostView(),
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presentation: controller.currentPreferences().presentationStyle(viewportSize: controller.currentLayoutContext().viewportSize)
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) { [weak controller] pageCounts in
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guard let controller, self.context.paginationToken == token else { return }
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let snapshot = readingSession.makePaginationSnapshot(
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pageCounts: pageCounts,
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preferences: controller.currentPreferences(),
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layoutContext: controller.currentLayoutContext()
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)
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self.context.paginator = nil
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self.context.runtime?.applyPaginationSnapshot(snapshot, restoreLocation: restoreLocation)
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}
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}
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/// 应用文本图书模型：生成分页快照并完成分页流程。
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func applyTextBook(_ textBook: RDEPUBTextBook, restoreLocation: RDEPUBLocation?) {
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guard let controller = context.controller else { return }
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context.textBook = textBook
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context.bookPageMap = nil
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let snapshot = controller.nativeTextSnapshot(from: textBook)
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context.replaceActiveSnapshot(snapshot)
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guard !textBook.pages.isEmpty else {
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context.handle(error: RDEPUBParserError.emptySpine)
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return
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}
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finishPagination(restoreLocation: restoreLocation)
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}
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/// 应用分页快照（Fixed Layout 或 Web 内容），并完成分页流程。
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func applyPaginationSnapshot(
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_ snapshot: (pages: [EPUBPage], chapters: [EPUBChapterInfo]),
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restoreLocation: RDEPUBLocation?
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) {
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guard context.controller != nil else { return }
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context.textBook = nil
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context.bookPageMap = nil
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context.replaceActiveSnapshot(snapshot)
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guard !snapshot.pages.isEmpty else {
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context.handle(error: RDEPUBParserError.emptySpine)
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return
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}
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finishPagination(restoreLocation: restoreLocation)
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}
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/// 分页完成后的收尾：刷新视图、恢复阅读位置、处理待定视口变更。
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func finishPagination(restoreLocation: RDEPUBLocation?) {
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guard let controller = context.controller,
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let readerView = context.readerView else { return }
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controller.isRepaginating = false
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controller.hideLoading()
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readerView.reloadData()
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if let targetLocation = restoreLocation {
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controller.restoreReadingLocation(targetLocation)
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context.readingSession?.transition(to: .idle)
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} else {
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readerView.transitionToPage(pageNum: 0)
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context.readingSession?.transition(to: .idle)
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}
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context.runtime?.viewportMonitor.processPendingChangeAfterPagination()
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}
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/// 重新分页并保持当前阅读位置（优先使用待恢复位置，其次当前位置，最后持久化位置）。
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func repaginatePreservingCurrentLocation() {
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guard context.publication != nil else { return }
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let restoreLocation = context.runtime?.viewportMonitor.consumePendingPresentationRestoreLocation()
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?? context.currentVisibleLocation()
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?? context.persistenceLocation()
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paginatePublication(restoreLocation: restoreLocation)
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}
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/// 刷新可见内容并保持当前阅读位置不变。
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func refreshVisibleContentPreservingLocation() {
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guard let readerView = context.readerView else { return }
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let restoreLocation = context.currentVisibleLocation() ?? context.persistenceLocation()
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readerView.reloadData()
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if let restoreLocation {
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_ = context.restoreReadingLocation(restoreLocation)
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}
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}
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/// 重建外部纯文本图书（布局变更后重新排版）。
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func rebuildExternalTextBook() {
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guard let controller = context.controller,
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let textFileURL = controller.textFileURL else { return }
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let restoreLocation = context.currentVisibleLocation() ?? context.persistenceLocation()
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let pageSize = controller.currentTextPageSize()
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let style = controller.currentTextRenderStyle()
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let builder = context.makePlainTextBookBuilder(layoutConfig: controller.currentTextLayoutConfig(pageSize: pageSize))
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if let newBook = try? builder.build(textFileURL: textFileURL, pageSize: pageSize, style: style) {
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context.runtime?.applyTextBook(newBook, restoreLocation: restoreLocation)
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}
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}
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private func paginateTextPublication(
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parser: RDEPUBParser,
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publication: RDEPUBPublication,
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readingSession: RDEPUBReadingSession,
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restoreLocation: RDEPUBLocation?,
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token: UUID
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) {
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guard let controller = context.controller else { return }
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let context = self.context
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let pageSize = controller.currentTextPageSize()
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context.lastTextPaginationPageSize = pageSize
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DispatchQueue.global(qos: .utility).async { [weak controller] in
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guard controller != nil else { return }
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guard context.controller != nil else { return }
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if let restoredPageMap = self.restoreBookPageMapIfPossible(publication: publication) {
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DispatchQueue.main.async {
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guard context.paginationToken == token,
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context.controller != nil else { return }
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context.runtime?.applyBookPageMap(restoredPageMap, restoreLocation: restoreLocation)
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}
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return
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}
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let prioritizedCandidates = self.prioritizedBuildableSpineIndices(
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publication: publication,
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readingSession: readingSession,
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restoreLocation: restoreLocation
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)
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guard prioritizedCandidates.first != nil else {
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DispatchQueue.main.async {
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guard context.paginationToken == token,
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context.controller != nil else { return }
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context.handle(error: RDEPUBParserError.emptySpine)
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}
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return
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}
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do {
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guard context.controller != nil,
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let runtime = context.runtime else { return }
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RDEPUBBackgroundTrace.log(
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"QuickOpen",
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"begin token=\(token.uuidString) candidates=\(prioritizedCandidates.count) restoreSpine=\(readingSession.initialSpineIndex(for: restoreLocation))"
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)
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let runtimeChapter = try RDEPUBBackgroundTrace.measure(
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"QuickOpen",
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"loadFirstRenderableRuntimeChapter"
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) {
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try self.loadFirstRenderableRuntimeChapter(
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prioritizedSpineIndices: prioritizedCandidates,
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runtime: runtime
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)
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}
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let quickWindowChapters = try RDEPUBBackgroundTrace.measure(
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"QuickOpen",
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"loadInitialRuntimeChapters anchorSpine=\(runtimeChapter.spineIndex)"
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) {
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try self.loadInitialRuntimeChapters(
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anchorSpineIndex: runtimeChapter.spineIndex,
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publication: publication,
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runtime: runtime
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)
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}
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RDEPUBBackgroundTrace.log(
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"QuickOpen",
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"ready anchorSpine=\(runtimeChapter.spineIndex) quickWindow=\(quickWindowChapters.map { $0.spineIndex }) pages=\(quickWindowChapters.reduce(0) { $0 + $1.pages.count })"
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)
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DispatchQueue.main.async {
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guard context.paginationToken == token,
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context.controller != nil else { return }
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runtime.chapterRuntimeStore.setCurrentChapter(
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spineIndex: runtimeChapter.spineIndex,
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totalSpineCount: publication.spine.count,
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windowRadius: context.configuration.chapterWindowRadius
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)
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let partialMap = self.makePartialPageMap(from: quickWindowChapters)
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runtime.applyBookPageMap(partialMap, restoreLocation: restoreLocation)
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self.paginateMetadataOnly(token: token, restoreLocation: restoreLocation)
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}
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} catch {
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DispatchQueue.main.async {
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guard context.paginationToken == token,
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context.controller != nil else { return }
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context.handle(error: error)
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}
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}
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}
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}
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private func loadFirstRenderableRuntimeChapter(
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prioritizedSpineIndices: [Int],
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runtime: RDEPUBReaderRuntime
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) throws -> RDEPUBRuntimeChapter {
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var lastError: Error?
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for spineIndex in prioritizedSpineIndices {
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do {
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return try runtime.chapterLoader.loadChapterSynchronouslyForMigration(
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spineIndex: spineIndex,
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store: runtime.chapterRuntimeStore
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)
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} catch {
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lastError = error
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RDEPUBBackgroundTrace.log("QuickOpen", "skip spine=\(spineIndex) reason=\(error)")
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}
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}
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throw lastError ?? RDEPUBParserError.emptySpine
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}
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private func loadInitialRuntimeChapters(
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anchorSpineIndex: Int,
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publication: RDEPUBPublication,
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runtime: RDEPUBReaderRuntime
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) throws -> [RDEPUBRuntimeChapter] {
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let windowSpineIndices = initialWindowSpineIndices(
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around: anchorSpineIndex,
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in: publication,
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maxChapterCount: context.configuration.onDemandChapterWindowSize
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)
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var chapters: [RDEPUBRuntimeChapter] = []
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for spineIndex in windowSpineIndices {
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do {
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let chapter = try runtime.chapterLoader.loadChapterSynchronouslyForMigration(
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spineIndex: spineIndex,
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store: runtime.chapterRuntimeStore
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)
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chapters.append(chapter)
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} catch {
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if spineIndex == anchorSpineIndex {
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throw error
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}
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RDEPUBBackgroundTrace.log("QuickOpen", "skip adjacent spine=\(spineIndex) reason=\(error)")
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}
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}
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return chapters
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}
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private func initialWindowSpineIndices(
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around anchorSpineIndex: Int,
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in publication: RDEPUBPublication,
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maxChapterCount: Int = 3
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) -> [Int] {
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let normalizedMaxChapterCount = RDEPUBReaderConfiguration.normalizedChapterWindowSize(maxChapterCount)
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let buildableIndices = allBuildableSpineIndices(in: publication)
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guard let anchorPosition = buildableIndices.firstIndex(of: anchorSpineIndex) else {
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return [anchorSpineIndex]
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}
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var selected = [anchorSpineIndex]
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var nextPosition = anchorPosition + 1
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var previousPosition = anchorPosition - 1
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while selected.count < normalizedMaxChapterCount,
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nextPosition < buildableIndices.count || previousPosition >= 0 {
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if nextPosition < buildableIndices.count {
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selected.append(buildableIndices[nextPosition])
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nextPosition += 1
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if selected.count == normalizedMaxChapterCount {
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break
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}
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}
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if previousPosition >= 0 {
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selected.insert(buildableIndices[previousPosition], at: 0)
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previousPosition -= 1
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}
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}
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return selected
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}
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private func makePartialPageMap(from chapters: [RDEPUBRuntimeChapter]) -> RDEPUBBookPageMap {
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var builder = RDEPUBBookPageMap.Builder()
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for chapter in chapters {
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builder.add(
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spineIndex: chapter.spineIndex,
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href: chapter.href,
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title: chapter.title,
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pageCount: chapter.pages.count,
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fragmentOffsets: chapter.chapterOffsetMap.fragmentOffsets
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)
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}
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return builder.build()
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}
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private func prioritizedBuildableSpineIndices(
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publication: RDEPUBPublication,
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readingSession: RDEPUBReadingSession,
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restoreLocation: RDEPUBLocation?
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) -> [Int] {
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let preferred = readingSession.initialSpineIndex(for: restoreLocation)
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return publication.spine.indices
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.filter { isBuildableTextSpine(at: $0, in: publication) }
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.sorted { lhs, rhs in
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abs(lhs - preferred) < abs(rhs - preferred)
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}
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}
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private func allBuildableSpineIndices(in publication: RDEPUBPublication) -> [Int] {
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publication.spine.indices.filter { isBuildableTextSpine(at: $0, in: publication) }
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}
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private func waitForReadingInteractionToSettle(using context: RDEPUBReaderContext) {
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while context.controller != nil,
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context.secondsSinceLastUserNavigation() < backgroundInteractionCooldown {
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Thread.sleep(forTimeInterval: 0.08)
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}
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}
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private func isBuildableTextSpine(at index: Int, in publication: RDEPUBPublication) -> Bool {
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guard publication.spine.indices.contains(index) else { return false }
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let item = publication.spine[index]
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return item.linear && (item.mediaType.contains("html") || item.mediaType.contains("xhtml"))
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}
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// MARK: - 元数据专用解析（Phase 0）
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/// 后台遍历所有章节，只提取轻量元数据（pageCount、pageRanges、fragmentOffsets），
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/// 写入磁盘摘要缓存，不累积 RDEPUBTextBook。
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func paginateMetadataOnly(token: UUID, restoreLocation: RDEPUBLocation?) {
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let context = self.context
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guard let parser = context.parser,
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let publication = context.publication else { return }
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let pageSize = context.currentTextPageSize()
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let layoutConfig = context.currentTextLayoutConfig(pageSize: pageSize)
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let style = context.currentTextRenderStyle()
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let allBuildableIndices = allBuildableSpineIndices(in: publication)
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let summaryDiskCache = context.runtime?.summaryDiskCache
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let workerCount = max(1, context.configuration.metadataParsingConcurrency)
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let cpuCount = ProcessInfo.processInfo.activeProcessorCount
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RDEPUBBackgroundTrace.log("MetadataParse", "config concurrency=\(workerCount) cpuCores=\(cpuCount)")
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DispatchQueue.global(qos: .utility).async { [weak self] in
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guard let self else { return }
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guard context.controller != nil else { return }
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let catalog = allBuildableIndices.map { spineIndex in
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let item = publication.spine[spineIndex]
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return (
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key: context.chapterCacheKey(forSpineIndex: spineIndex),
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spineIndex: spineIndex,
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href: item.href,
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title: item.title
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)
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}
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let restored = summaryDiskCache?.readAll(keys: catalog)
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RDEPUBBackgroundTrace.log(
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"MetadataParse",
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"begin token=\(token.uuidString) buildableChapters=\(allBuildableIndices.count) concurrency=\(workerCount)"
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)
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let cachedSummaries = restored?.summaries ?? [:]
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let cachedSpineIndices = Set(cachedSummaries.keys)
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let resultLock = NSLock()
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var summariesBySpineIndex = cachedSummaries
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var totalResolvedCount = cachedSpineIndices.count
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var lastAppliedCount = cachedSpineIndices.count
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if !cachedSpineIndices.isEmpty {
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RDEPUBBackgroundTrace.log(
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"MetadataParse",
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"resumeFromCache cachedChapters=\(cachedSpineIndices.count) total=\(allBuildableIndices.count)"
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)
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let cachedMap = self.buildPageMap(from: catalog, summaries: summariesBySpineIndex)
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DispatchQueue.main.async {
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guard context.paginationToken == token,
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context.controller != nil else { return }
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context.runtime?.refreshBookPageMapInPlace(cachedMap)
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}
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}
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let uncachedSpineIndices = allBuildableIndices.filter { !cachedSpineIndices.contains($0) }
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self.waitForReadingInteractionToSettle(using: context)
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let wallClockStart = CFAbsoluteTimeGetCurrent()
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var totalRenderMs: Double = 0
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var totalWriteMs: Double = 0
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var completedChapters = 0
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var failedChapters = 0
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let timingLock = NSLock()
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let queue = OperationQueue()
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queue.name = "com.rdreader.metadata.parse"
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queue.qualityOfService = .utility
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queue.maxConcurrentOperationCount = workerCount
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for (offset, spineIndex) in uncachedSpineIndices.enumerated() {
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queue.addOperation {
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guard context.controller != nil,
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context.paginationToken == token else {
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return
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}
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do {
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RDEPUBBackgroundTrace.log("MetadataParse", "正在解析 spine=\(spineIndex) \(offset + 1)/\(uncachedSpineIndices.count)")
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let renderResult: RDEPUBChapterSummary? = try autoreleasepool { () -> RDEPUBChapterSummary? in
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let chapterBuilder = context.makeTextBookBuilder(layoutConfig: layoutConfig)
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let renderStart = CFAbsoluteTimeGetCurrent()
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guard let result = try chapterBuilder.buildChapter(
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parser: parser,
|
||
publication: publication,
|
||
spineIndex: spineIndex,
|
||
pageSize: pageSize,
|
||
style: style
|
||
) else {
|
||
return nil
|
||
}
|
||
let renderElapsed = (CFAbsoluteTimeGetCurrent() - renderStart) * 1000
|
||
|
||
let chapter = result.chapter
|
||
let cacheKey = context.chapterCacheKey(forSpineIndex: spineIndex)
|
||
let summary = RDEPUBChapterSummary(
|
||
pageRanges: chapter.pages.map { .init(location: $0.contentRange.location, length: $0.contentRange.length) },
|
||
pageCount: chapter.pages.count,
|
||
fragmentOffsets: chapter.fragmentOffsets,
|
||
renderSignature: cacheKey.renderSignature,
|
||
schemaVersion: RDEPUBChapterSummary.currentSchemaVersion,
|
||
chapterContentHash: cacheKey.chapterContentHash,
|
||
pageMetadataList: chapter.pages.map { .from($0.metadata) }
|
||
)
|
||
let writeStart = CFAbsoluteTimeGetCurrent()
|
||
summaryDiskCache?.write(summary: summary, for: cacheKey)
|
||
let writeElapsed = (CFAbsoluteTimeGetCurrent() - writeStart) * 1000
|
||
|
||
timingLock.lock()
|
||
totalRenderMs += renderElapsed
|
||
totalWriteMs += writeElapsed
|
||
completedChapters += 1
|
||
timingLock.unlock()
|
||
|
||
RDEPUBBackgroundTrace.log(
|
||
"MetadataParse",
|
||
"spine=\(spineIndex) renderMs=\(Int(renderElapsed)) writeMs=\(Int(writeElapsed))"
|
||
)
|
||
return summary
|
||
}
|
||
|
||
guard let renderResult else { return }
|
||
|
||
var partialMap: RDEPUBBookPageMap?
|
||
resultLock.lock()
|
||
summariesBySpineIndex[spineIndex] = renderResult
|
||
totalResolvedCount += 1
|
||
if totalResolvedCount - lastAppliedCount >= 32 || totalResolvedCount == allBuildableIndices.count {
|
||
lastAppliedCount = totalResolvedCount
|
||
partialMap = self.buildPageMap(from: catalog, summaries: summariesBySpineIndex)
|
||
}
|
||
resultLock.unlock()
|
||
|
||
if let partialMap {
|
||
DispatchQueue.main.async {
|
||
guard context.paginationToken == token,
|
||
context.controller != nil else { return }
|
||
context.runtime?.refreshBookPageMapInPlace(partialMap)
|
||
}
|
||
}
|
||
} catch {
|
||
timingLock.lock()
|
||
failedChapters += 1
|
||
timingLock.unlock()
|
||
RDEPUBBackgroundTrace.log("MetadataParse", "buildChapter FAILED: spine=\(spineIndex) error=\(error)")
|
||
}
|
||
}
|
||
}
|
||
queue.waitUntilAllOperationsAreFinished()
|
||
summaryDiskCache?.flushPendingWrites()
|
||
|
||
let wallClockMs = Int((CFAbsoluteTimeGetCurrent() - wallClockStart) * 1000)
|
||
timingLock.lock()
|
||
let renderTotal = Int(totalRenderMs)
|
||
let writeTotal = Int(totalWriteMs)
|
||
let rendered = completedChapters
|
||
let failed = failedChapters
|
||
timingLock.unlock()
|
||
let avgRenderMs = rendered > 0 ? renderTotal / rendered : 0
|
||
RDEPUBBackgroundTrace.log(
|
||
"MetadataParse",
|
||
"timing wallClockMs=\(wallClockMs) chapters=\(rendered) failed=\(failed) " +
|
||
"renderTotalMs=\(renderTotal) writeTotalMs=\(writeTotal) avgRenderMs=\(avgRenderMs) concurrency=\(workerCount)"
|
||
)
|
||
context.lastMetadataParseWallClockMs = wallClockMs
|
||
context.lastMetadataParseConcurrency = workerCount
|
||
|
||
guard context.controller != nil,
|
||
context.paginationToken == token else {
|
||
RDEPUBBackgroundTrace.log("MetadataParse", "abort: reader dismissed or token changed")
|
||
return
|
||
}
|
||
|
||
let pageMap = self.buildPageMap(from: catalog, summaries: summariesBySpineIndex)
|
||
RDEPUBBackgroundTrace.log(
|
||
"MetadataParse",
|
||
"complete chapters=\(pageMap.totalChapters) pages=\(pageMap.totalPages)"
|
||
)
|
||
|
||
DispatchQueue.main.async {
|
||
guard context.paginationToken == token,
|
||
context.controller != nil else { return }
|
||
context.runtime?.refreshBookPageMapInPlace(pageMap)
|
||
}
|
||
}
|
||
}
|
||
|
||
private func restoreBookPageMapIfPossible(publication: RDEPUBPublication) -> RDEPUBBookPageMap? {
|
||
guard let summaryDiskCache = context.runtime?.summaryDiskCache else {
|
||
return nil
|
||
}
|
||
let catalog = allBuildableSpineIndices(in: publication).map { spineIndex in
|
||
let item = publication.spine[spineIndex]
|
||
return (
|
||
key: context.chapterCacheKey(forSpineIndex: spineIndex),
|
||
spineIndex: spineIndex,
|
||
href: item.href,
|
||
title: item.title
|
||
)
|
||
}
|
||
guard summaryDiskCache.isCacheComplete(keys: catalog.map(\.key)) else {
|
||
return nil
|
||
}
|
||
let restored = summaryDiskCache.readAll(keys: catalog)
|
||
guard restored.summaries.count == catalog.count else {
|
||
return nil
|
||
}
|
||
return restored.mapBuilder.build()
|
||
}
|
||
|
||
private func buildPageMap(
|
||
from catalog: [(key: RDEPUBChapterCacheKey, spineIndex: Int, href: String, title: String)],
|
||
summaries: [Int: RDEPUBChapterSummary]
|
||
) -> RDEPUBBookPageMap {
|
||
var builder = RDEPUBBookPageMap.Builder()
|
||
for item in catalog {
|
||
guard let summary = summaries[item.spineIndex] else { continue }
|
||
builder.add(
|
||
spineIndex: item.spineIndex,
|
||
href: item.href,
|
||
title: item.title,
|
||
pageCount: summary.pageCount,
|
||
fragmentOffsets: summary.fragmentOffsets
|
||
)
|
||
}
|
||
return builder.build()
|
||
}
|
||
}
|