169 lines
6.0 KiB
Markdown
169 lines
6.0 KiB
Markdown
---
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phase: 13-llm
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plan: 06
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subsystem: semantic-segmentation
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tags: [strategy-pattern, protocol, unified-segmentation, extensibility, llm]
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# Dependency graph
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requires:
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- phase: 13-01
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provides: video-type-detection
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- phase: 13-02
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provides: semantic-boundary-detection
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- phase: 13-03
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provides: content-completeness-protection
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- phase: 13-04
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provides: title-generation
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- phase: 13-05
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provides: chinese-sentence-boundary
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provides:
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- SegmentationStrategy Protocol interface for extensibility
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- UnifiedSegmentationStrategy implementing unified approach (all video types)
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- SemanticSegmentationEngine using strategy injection pattern
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- Comprehensive test suite for strategy architecture
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affects: [13-07-srt-processor-integration]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [strategy-pattern, protocol-interface, dependency-injection, lazy-initialization]
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key-files:
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created: []
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modified:
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- kb_workflow/srt/semantic_engine.py (554 lines)
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- tests/test_semantic_engine.py (992 lines)
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key-decisions:
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- "Strategy Pattern with Protocol interface for extensibility (STRAT-01)"
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- "Unified segmentation strategy for all video types (per user decision, STRAT-02)"
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- "Strategy injection via constructor for easy testing and extension (STRAT-03)"
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patterns-established:
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- "Strategy Pattern: SegmentationStrategy Protocol defines interface"
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- "Unified Strategy: Single strategy for all video types (Phase 13)"
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- "Dependency Injection: SemanticSegmentationEngine accepts strategy via __init__"
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- "Lazy Initialization: AI client and fallback segmenter initialized on demand"
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requirements-completed: [STRAT-01, STRAT-02, STRAT-03]
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# Metrics
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duration: 12min
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started: 2026-03-21T16:28:24Z
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completed: 2026-03-21T16:40:15Z
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tasks: 1
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files: 2
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---
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# Phase 13 Plan 06: Extensible Strategy Architecture Summary
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**Strategy Pattern with SegmentationStrategy Protocol interface and UnifiedSegmentationStrategy for all video types**
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## Performance
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- **Duration:** 12 min
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- **Started:** 2026-03-21T16:28:24Z
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- **Completed:** 2026-03-21T16:40:15Z
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- **Tasks:** 1
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- **Files modified:** 2
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## Accomplishments
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- Implemented SegmentationStrategy Protocol interface defining the strategy contract
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- Implemented UnifiedSegmentationStrategy with unified approach for all video types (per user decision)
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- Refactored SemanticSegmentationEngine to use strategy injection pattern
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- Added comprehensive test suite (10 tests) verifying strategy extensibility
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- Preserved all existing functionality (video type detection, prompt building, fallback mechanism)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Implement extensible strategy architecture** - `0d8ed1f` (feat)
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**Plan metadata:** (pending final commit)
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## Files Created/Modified
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- `kb_workflow/srt/semantic_engine.py` - Added SegmentationStrategy Protocol, UnifiedSegmentationStrategy class, refactored SemanticSegmentationEngine to use strategy pattern (554 lines)
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- `tests/test_semantic_engine.py` - Added TestStrategyPatternArchitecture (7 tests) and TestStrategyPatternIntegration (3 tests) for comprehensive strategy verification (992 lines)
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## Deviations from Plan
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None - plan executed exactly as specified.
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### Implementation Details
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**SegmentationStrategy Protocol:**
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- Defines the `segment()` method signature for all strategies
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- Uses Python's `typing.Protocol` for structural subtyping
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- Enables runtime duck typing with compile-time type checking
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**UnifiedSegmentationStrategy:**
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- Implements unified approach for all video types (per user decision)
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- Video type used only for prompt context, not for strategy selection
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- Contains all LLM interaction logic moved from SemanticSegmentationEngine
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- Preserves video type detection, prompt building, and fallback mechanisms
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**SemanticSegmentationEngine:**
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- Now uses strategy injection via constructor
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- Defaults to UnifiedSegmentationStrategy when no strategy provided
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- Delegates all segmentation logic to the strategy
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- Simplified to a thin wrapper around the strategy
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**Test Coverage:**
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- TestStrategyPatternArchitecture (7 tests):
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- Protocol interface definition
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- UnifiedSegmentationStrategy implementation
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- SemanticSegmentationEngine uses strategy
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- Custom strategy injection
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- Unified strategy applies to all video types
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- Strategy switching doesn't affect functionality
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- Strategy extensibility for future types
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- TestStrategyPatternIntegration (3 tests):
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- Preserves video type detection
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- Preserves prompt building
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- Preserves fallback mechanism
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## Decisions Made
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**Architecture Decision: Strategy Pattern with Protocol Interface**
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- Rationale: Enables future extension without modifying existing code (Open/Closed Principle)
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- Protocol provides clear contract while allowing duck typing
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- Easy to add new strategies (e.g., KnowledgeTypeStrategy, StoryTypeStrategy) in future
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**Design Decision: Unified Strategy for Phase 13**
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- Per user decision: No type-specific strategies in Phase 13
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- Video type used only for prompt context, not strategy selection
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- Architecture ready for type-specific strategies if needed later
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**Implementation Decision: Strategy Injection via Constructor**
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- Allows easy testing with mock strategies
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- Supports runtime strategy switching if needed
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- Follows dependency injection best practices
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## Requirements Completed
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- **STRAT-01:** SegmentationStrategy Protocol interface defined ✅
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- **STRAT-02:** UnifiedSegmentationStrategy implemented for all video types ✅
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- **STRAT-03:** Strategy architecture supports extensibility (verified via custom strategy injection test) ✅
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## Next Phase Readiness
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**Ready for Phase 13 Plan 07 (SRTProcessor Integration):**
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- Strategy architecture complete and tested
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- SemanticSegmentationEngine provides clean interface
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- All existing functionality preserved
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- No blockers or concerns
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**Architecture Benefits:**
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- Easy to add new strategies without modifying existing code
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- Testable design with dependency injection
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- Clear separation of concerns (engine vs strategy)
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- Ready for future enhancements (type-specific strategies, advanced heuristics)
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---
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*Phase: 13-llm*
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*Plan: 06*
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*Completed: 2026-03-21*
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