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>
46 lines
1.9 KiB
Markdown
46 lines
1.9 KiB
Markdown
---
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kind: CONCEPT
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slug: messaging-observability-c06
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title: Set 인스턴스를 락으로 쓰지만 외부 경합이 없다
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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:messaging-observability-c06
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evidenceCapturedOn: 2026-09-01
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assets:
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- key: messaging-observability-c06
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file: ../../../final/evidence/rendered/messaging-observability-c06.svg
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evidence:
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- ../../../final/evidence/raw/messaging-observability-c06.txt
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source:
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- 원본 분석 절은 analysis/messaging/messaging-observability.md#L363 이다.
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module: messaging-observability
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---
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# Set 인스턴스를 락으로 쓰지만 외부 경합이 없다
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트랜잭션이 없고, 이 leaf는 messaging family에서 `messaging-transport-spi` 다음으로 동시성이 조밀하다.
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## 관계
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- **타입이 문서화한 불변식은 타입이 강제한다**
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같은 분석 리프에서 끌어낸 규칙이다.
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## 본문
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<!-- body:start -->
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트랜잭션 없음. 이 leaf는 messaging family에서 `messaging-transport-spi` 다음으로 동시성이 조밀하다. `MessagingRedactor`·`MessagingTracer`·`DefaultMessagingObservationConvention`은 상태가 없고 `MessagingTags`는 불변 record다.
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## MessagingRedactor 참조 위치
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:::evidence key="messaging-observability-c06" alt="코드베이스에서 MessagingRedactor 를 검색한 출력 13줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="MessagingRedactor 코드베이스 검색 — 13줄 · exit 0" zoom="true"
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:::
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## Set 인스턴스를 락으로 쓰는 것이 안전한 이유
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**`synchronized(values)`가 `Set` 인스턴스를 락으로 쓴다.** 그 `Set`은 `ConcurrentHashMap.newKeySet()`이고 외부에 노출되지 않으므로(`observed` 맵이 private) 외부 락 경합은 없다. 차원별로 락이 분리되는 효과도 있다.
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<!-- body:end -->
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