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feat: configurable chapter window & parallel metadata parsing with benchmark

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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)
This commit is contained in:
shen
2026-06-03 23:38:11 +08:00
parent feb05eaf87
commit d20196ee34
17 changed files with 932 additions and 153 deletions
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Sources/RDReaderView/EPUBUI/RDURLReaderController.swift
+4 -1
View File
@@ -347,7 +347,10 @@ public final class RDURLReaderController: UIViewController {
"knownChapters=\(mapSnapshot.knownChapters)",
"buildableChapters=\(mapSnapshot.buildableChapters)",
"avoidWidows=\(layoutConfig?.avoidWidows == true ? 1 : 0)",
"avoidOrphans=\(layoutConfig?.avoidOrphans == true ? 1 : 0)"
"avoidOrphans=\(layoutConfig?.avoidOrphans == true ? 1 : 0)",
"windowSize=\(readerController?.configuration.onDemandChapterWindowSize ?? epubConfiguration.onDemandChapterWindowSize)",
"parseMs=\(readerController?.readerContext.lastMetadataParseWallClockMs ?? 0)",
"parseConcurrency=\(readerController?.readerContext.lastMetadataParseConcurrency ?? 0)"
].joined(separator: " ")
demoStateLabel.text = state
if let logPrefix {