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>
62 lines
2.8 KiB
Markdown
62 lines
2.8 KiB
Markdown
---
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kind: CONCEPT
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slug: messaging-inbox-jdbc-postgresql-c01
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title: 메커니즘 전체가 하나의 SQL 문장에 있다
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topic: transaction-and-consistency-models
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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-inbox-jdbc-postgresql-c01
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evidenceCapturedOn: 2026-09-01
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assets:
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- key: messaging-inbox-jdbc-postgresql-c01
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file: ../../../final/evidence/rendered/messaging-inbox-jdbc-postgresql-c01.svg
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evidence:
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- ../../../final/evidence/raw/messaging-inbox-jdbc-postgresql-c01.txt
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source:
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- 원본 분석 절은 analysis/messaging/messaging-inbox-jdbc-postgresql.md#L57 이다.
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module: messaging-inbox-jdbc-postgresql
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---
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# 메커니즘 전체가 하나의 SQL 문장에 있다
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`messaging-reliability-api`의 `InboxRepository`·`IdempotentMessageHandler` 포트를 PostgreSQL로 구현한다. 중복 제거 메커니즘 전체가 복합 기본키 하나에 있다.
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## 관계
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- **컬럼 폭은 애플리케이션 검증과 짝을 이룬다**
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같은 분석 리프에서 끌어낸 규칙이다.
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- **같은 안전 규칙은 한 공식과 한 강제 시점을 갖는다**
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같은 분석 리프에서 끌어낸 규칙이다.
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## 본문
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<!-- body:start -->
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`messaging-reliability-api`의 `InboxRepository`·`IdempotentMessageHandler` 포트를 PostgreSQL로 구현한다. 이름이 기술을 드러낸다 — `docs/messaging/support-matrix.md`가 그 개명 이유를 적는다(MSG-023).
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**메커니즘 전체가 하나의 SQL 문장에 있다.**
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```sql
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INSERT INTO messaging_inbox (message_id, consumer_id, processed_at)
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VALUES (?, ?, ?)
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ON CONFLICT (message_id, consumer_id) DO NOTHING
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```
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> "Reservation is an `INSERT ... ON CONFLICT DO NOTHING` whose affected-row count is the answer: one means first delivery, zero means already processed. The composite primary key does the work, so there is no read-then-write race — two concurrent deliveries of the same message cannot both see 'not processed' and both proceed."
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## InboxRepository 참조 위치
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:::evidence key="messaging-inbox-jdbc-postgresql-c01" alt="코드베이스에서 InboxRepository 를 검색한 출력 20줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="InboxRepository 코드베이스 검색 — 20줄 · exit 0" zoom="true"
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:::
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## 실제로 실행되는 레인
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migration이 같은 사실을 반대편에서 적고, `build.gradle` 주석이 테스트 전략을 명시한다. **그리고 실제로 실행된다** — `InboxPostgresIT` 6개가 기본 `test` 태스크에서 통과한다(§10).
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## migration이 같은 사실을 적는다
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복합 기본키가 중복 제거 메커니즘이고, 예약은 핸들러의 부작용과 같은 트랜잭션 안에서 성공하거나 키를 위반하는 INSERT다.
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<!-- body:end -->
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