DongHyeonkaandClaude Opus 5
b2963105a8
The keycloak project ended with four open questions that design could not
settle. A two-VM lab was built to answer them by measurement, and this is
that material: 26 experiments, 125 raw command outputs, 22 browser captures.
Follows the import procedure in README.md.
source/ the originating repository verbatim — 78 documents, 28 SVGs,
8 manifests, plus .source-revision recording the commit
final/ the SSOT
document.md 729 lines written from the 29 experiment documents, not
concatenated: what was predicted, what was measured, and
where the measurement itself was wrong
evidence/raw 125 outputs, flattened to <experiment>__<file> because
the originals collided (01-baseline.txt appeared three
times) and the audit only globs the top level
evidence/meta one per raw file; command and exitCode are null and the
README says why rather than inventing them
evidence/browser 22 captures
assets/ three diagrams through techviz
.techviz/ their VizSpecs
A separate project rather than an addition to keycloak: the B-layer answers
that project's four questions, but the A, C and D layers are about cluster
failure, SSO and operations, and one document.md should hold one subject.
The four question records there can point here through 관계.
Recorded rather than papered over: only three of the 28 diagrams were
remade. The repository forbids hand-drawn SVG and forbids titles inside the
canvas; all 28 originals carry both, so converting them is redrawing, not
reformatting. They stay in source/ and the gap is written into the document.
verify-pipeline.py passes. audit-records.py reports no issues.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
52 lines
2.9 KiB
Markdown
52 lines
2.9 KiB
Markdown
---
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kind: CONCEPT
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slug: adapter-outbound-persistence-jpa-c03
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title: 위험한 shape 자체를 표현하기 어렵게 만든다
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topic: state-machines-and-ownership
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project: clean-architecture-backend-template
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status: 게시 전
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sourceRevision: 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916
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rootTreeNode: concept:adapter-outbound-persistence-jpa-c03
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evidenceCapturedOn: 2026-09-01
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assets:
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- key: adapter-outbound-persistence-jpa-c03
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file: ../../../final/evidence/rendered/adapter-outbound-persistence-jpa-c03.svg
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evidence:
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- ../../../final/evidence/raw/adapter-outbound-persistence-jpa-c03.txt
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source:
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- 원본 분석 절은 analysis/05-adapter-outbound-persistence-jpa.md#L208 이다.
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module: adapter-outbound-persistence-jpa
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---
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# 위험한 shape 자체를 표현하기 어렵게 만든다
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error hierarchy의 핵심은 예외 class를 많이 만든 것이 아니라 provider-specific signal을 bounded semantic category로 변환하는 것이다.
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## 본문
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<!-- body:start -->
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error hierarchy의 핵심은 "예외 class를 많이 만든 것"이 아니라 provider-specific signal을 bounded semantic category로 변환하는 것이다. 대표 category는 serialization failure, deadlock, optimistic conflict, lock not available, connection unavailable, timeout 계열, unique/FK/not-null/check constraint, entity not found, schema mismatch, data corruption, completion unknown이다. 이 category는 뒤의 retry policy/metric이 SQLSTATE/provider message를 직접 해석하지 않게 하는 중간 vocabulary다.
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## JpaFailureContext 참조 위치
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:::evidence key="adapter-outbound-persistence-jpa-c03" alt="코드베이스에서 JpaFailureContext 를 검색한 출력 31줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="JpaFailureContext 코드베이스 검색 — 31줄 · exit 0" zoom="true"
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:::
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## 표현 자체를 막는 네 불변식
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`JpaFailureContext`가 가지는 정보는 operation, SQLSTATE/constraint, attempt, retryability, completion-unknown, elapsed, trace 등으로 제한된다.
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- arbitrary identifier는 그대로 담지 않고 bounded/redacted form으로 축약
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- malformed SQLSTATE는 `redacted`, absent SQLSTATE는 sentinel로 표현
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- completion unknown과 retryable=true를 동시에 표현할 수 없음
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- completion-unknown factory는 항상 automatic retry를 차단하는 형태를 만든다
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즉 "exception이 발생한 뒤 로그에서 실수하지 말자"보다 앞선 위치에서 **failure context가 위험한 shape 자체를 표현하기 어렵게** 만든다.
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## 메시지가 provider cause를 복사하지 않는다
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base exception message는 provider cause message를 그대로 복사하지 않고 category + bounded context로 만든다. dedicated test도 provider cause에 email marker를 넣었을 때 top-level exception message에 노출되지 않는 것을 검증한다. 동시에 raw `Throwable cause`는 보존한다.
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<!-- body:end -->
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