⚡ Bolt: 원시 타입 박싱 방지 및 StringBuilder를 활용한 Ledger 직렬화 최적화

[seonghobae]

💡 What: String.join()과 String.valueOf()를 사용하여 탭 구분 문자열을 생성하던 Ledger 직렬화 로직(ArtifactLinkLedger, KpiSnapshotLedger)을 미리 크기가 지정된 StringBuilder와 메서드 체이닝 .append()로 교체했습니다.
🎯 Why: String.join()은 내부적으로 varargs 배열을 생성하며, String.valueOf()는 원시 타입을 박싱하는 불필요한 중간 객체를 생성합니다. 특히 많은 필드를 가진 Ledger 직렬화처럼 빈번하게 호출되는 경로에서는 이는 GC(가비지 컬렉션) 오버헤드를 유발합니다.
📊 Impact: 가변 길이 문자열 배열(varargs) 생성과 원시 타입 박싱(String.valueOf)을 방지하여 메모리 할당(Allocation)을 줄이고 런타임 성능을 향상시킵니다.
🔬 Measurement: Ledger 직렬화 메서드를 호출하는 테스트(mvn -B --no-transfer-progress verify)가 100% JaCoCo 커버리지와 함께 정상 통과함을 확인했습니다.

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PR created automatically by Jules for task 15923865908379895939 started by @seonghobae

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📒 Files selected for processing (3)

• .jules/bolt.md
• src/main/java/com/clearfolio/viewer/analytics/KpiSnapshotLedger.java
• src/main/java/com/clearfolio/viewer/artifact/ArtifactLinkLedger.java

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