결제 전환 목표 아키텍처 정의 (ARC-CONFLICT-1783826101)
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docs/architecture/transaction-sequence.md
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docs/architecture/transaction-sequence.md
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```mermaid
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sequenceDiagram
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participant Controller
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participant Service
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participant Database
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Controller->>Service: 결제 처리 요청
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activate Service
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Service->>Database: DB 작업 수행
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activate Database
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Database-->>Service: 결과
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deactivate Database
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Service-->>Controller: 결제 결과 반환
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deactivate Service
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Note over Controller: 외부 실패 및 DB 실패 처리
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alt 외부 실패
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Controller->>Service: 외부 결제 서비스 실패
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else DB 실패
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Service->>Database: DB 처리 실패
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end
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Note over Controller: 최종 커밋/롤백 경계
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activate Database
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opt Commit
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Database-->>Service: 커밋 성공
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else Rollback
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Database-->>Service: 롤백 수행
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end
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```
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