Files
document-haness/docs/clean-architecture-backend-template/tech-log-studio/state-machines-and-ownership/concept/concept-adapter-outbound-fileserver-c04.md
T
DongHyeonkaandClaude Opus 5 b2963105a8 docs(keycloak-session-store): import the session-storage lab as a new project
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>
2026-09-04 22:51:59 +09:00

2.1 KiB

kind, slug, title, topic, project, status, sourceRevision, rootTreeNode, evidenceCapturedOn, assets, evidence, source, module
kind slug title topic project status sourceRevision rootTreeNode evidenceCapturedOn assets evidence source module
CONCEPT adapter-outbound-fileserver-c04 배타성이 필요한 쪽에만 OS 락을 둔다 state-machines-and-ownership clean-architecture-backend-template 게시 전 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916 concept:adapter-outbound-fileserver-c04 2026-09-01
key file
adapter-outbound-fileserver-c04 ../../../final/evidence/rendered/adapter-outbound-fileserver-c04.svg
../../../final/evidence/raw/adapter-outbound-fileserver-c04.txt
원본 분석 절은 analysis/08-adapter-outbound-fileserver.md#L192 이다.
adapter-outbound-fileserver

배타성이 필요한 쪽에만 OS 락을 둔다

한 클래스 안에 락이 두 종류다. 얼핏 비대칭으로 보이지만 각자의 커밋 방식이 다르다.

본문

한 클래스 안에 락이 두 종류다. 얼핏 비대칭으로 보이지만 각자의 커밋 방식이 다르다 — 배타성이 필요한 쪽(replace)에는 OS 락을 두고, 원시연산 자체가 배타적인 쪽(create-link)에는 JVM 스트라이프만 둔 것이다.

SecureRandom 참조 위치

:::evidence key="adapter-outbound-fileserver-c04" alt="코드베이스에서 SecureRandom 를 검색한 출력 39줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="SecureRandom 코드베이스 검색 — 39줄 · exit 0" zoom="true" :::

root 미포함이 배타 누락으로 이어지지 않는 이유

후자의 root 미포함은 과잉 직렬화 방향이라(다른 root의 같은 fileId가 같은 스트라이프를 공유) 배타 누락으로는 이어지지 않고, fileIdSecureRandom 16바이트라 실질 충돌도 없다. 결함이 아니라 설계로 기록한다.

충돌 경로가 닫히는 방법

createLink가 충돌하면 임시 파일을 정확히 지우고, 기존 레코드를 읽어 identity와 내용 동등성을 확인한 뒤 같으면 repair, 다르면 CONFLICT다. concurrentCrossInstanceImmutableCollisionIsNeverClassifiedAsStorage가 그 분류를 고정한다.