ReadViewSDK/.planning/phases/08-pagination-quality-cache-performance/08-03-SUMMARY.md

Plan 08-03 Summary: Performance Sampling + Cache Integration

Status: COMPLETE

What Was Done

Task 1: Created RDEPUBTextPerformanceSampler.swift

• File: Sources/RDReaderView/EPUBTextRendering/RDEPUBTextPerformanceSampler.swift (new)
• RDEPUBTextPerformanceSample struct with chapterHref, renderDuration, paginateDuration, pageCount, attributedStringLength, cacheHit
• RDEPUBTextPerformanceSampler class with record(_:), summary(), reset(), totalBuildDuration, samples
• Per-chapter [PERF] console logging with millisecond formatting

Task 2: Instrumented RDEPUBTextBookBuilder with cache + performance

• File: Sources/RDReaderView/EPUBTextRendering/RDEPUBTextBookBuilder.swift (modified)
• Added cache: RDEPUBTextBookCache? (optional, defaults to nil for backward compat)
• Added sampler: RDEPUBTextPerformanceSampler (always created)
• Added lastBuildPerformanceSamples: [RDEPUBTextPerformanceSample]
• Added lastBuildCacheStats: (hits: Int, misses: Int)
• build() method now:
  • Checks cache before building (cache HIT returns immediately)
  • Wraps renderer.renderChapter() with CFAbsoluteTimeGetCurrent() timing
  • Wraps content.rd_paginatedFrames() with timing
  • Records per-chapter RDEPUBTextPerformanceSample
  • Saves to cache on miss after successful build
  • Prints [PERF] summary at end
• Added makeCacheKey() helper using publication.metadata.identifier ?? publication.metadata.title

Pre-existing fixes (not in plan scope but required for clean build)

• RDEPUBTextBookCache.swift: Changed 4 private final class to final class to fix NSCoding "unstable name" errors (Swift compiler change in newer SDK)
• RDEPUBSelectionOverlayView.swift: Fixed empty array literal type annotation and commented-out code

Files Modified

File	Action
Sources/RDReaderView/EPUBTextRendering/RDEPUBTextPerformanceSampler.swift	CREATED
Sources/RDReaderView/EPUBTextRendering/RDEPUBTextBookBuilder.swift	MODIFIED
Sources/RDReaderView/EPUBTextRendering/RDEPUBTextBookCache.swift	MODIFIED (pre-existing NSCoding fix)
Sources/RDReaderView/EPUBUI/RDEPUBSelectionOverlayView.swift	MODIFIED (pre-existing error fix)

Build Verification

• xcodebuild build -scheme ReadViewDemo -destination 'platform=iOS Simulator,name=iPhone 17 Pro' -- BUILD SUCCEEDED

Key Links Established

• RDEPUBTextBookBuilder -> RDEPUBTextBookCache via cache.load(key:) / cache.save(_:key:)
• RDEPUBTextBookBuilder -> RDEPUBTextPerformanceSampler via sampler.record(sample)