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document-haness/docs/clean-architecture-backend-template/tech-log-studio/delivery-and-settlement-models/concept/concept-messaging-cloudevents-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

3.9 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 messaging-cloudevents-c04 왕복 검증이 producedAt 을 비교하지 않는다 delivery-and-settlement-models clean-architecture-backend-template 게시 전 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916 concept:messaging-cloudevents-c04 2026-09-01
key file
messaging-cloudevents-c04 ../../../final/evidence/rendered/messaging-cloudevents-c04.svg
key file
messaging-cloudevents-c04-diagram ../../../final/assets/diagrams/messaging-cloudevents-c04.svg
../../../final/evidence/raw/messaging-cloudevents-c04.txt
원본 분석 절은 analysis/messaging/messaging-cloudevents.md#L113 이다.
messaging-cloudevents

왕복 검증이 producedAt 을 비교하지 않는다

봉투 → CloudEvent CloudEvent → 봉투 두 번째는 messaging-core-api의 MessageEnvelope javadoc과 정확히 짝을 이룬다 — "A null Kafka value is a tombstone, which is a distinct broker-native operation with different retention semantics." 봉투가 payload를 non-null로 강제한 이유가 여기서 실제 매핑 규칙으로 나타난다. ProducerId가 "deployment-independent service name, not a host, pod, or connection identity, so that it stays a bounded value safe for metric tags"라고 선언한 것과 같은 관심사다.

관계

  • 왕복이라 부르는 테스트는 무엇을 보존하지 않는지도 적는다 같은 분석 리프에서 끌어낸 규칙이다.
  • 문서가 범위를 제한하면 그 제한을 누가 강제하는지 같이 적는다 같은 분석 리프에서 끌어낸 규칙이다.

본문

매핑 방향이 둘이고, 두 번째는 messaging-core-apiMessageEnvelope javadoc과 정확히 짝을 이룬다 — "A null Kafka value is a tombstone, which is a distinct broker-native operation with different retention semantics." 봉투가 payload를 non-null로 강제한 이유가 여기서 실제 매핑 규칙으로 나타난다.

producerFrom 의 방어가 완전하지 않다

ProducerId가 "deployment-independent service name, not a host, pod, or connection identity, so that it stays a bounded value safe for metric tags"라고 선언한 것과 같은 관심사다. 다만 이 방어는 완전하지 않다 — 마지막 세그먼트가 여전히 120 UTF-8 바이트를 넘거나 제어문자를 담을 수 있고, 그 경우 ProducerId 생성자가 IllegalArgumentException을 던진다(§4.5). urn:service:order-apiorder-api(테스트가 쓰는 형태), https://a.example/very/long/path/xx.

MessageEnvelope 참조 위치

:::evidence key="messaging-cloudevents-c04" alt="코드베이스에서 MessageEnvelope 를 검색한 출력 18줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="MessageEnvelope 코드베이스 검색 — 18줄 · exit 0" zoom="true" :::

봉투가 왕복에서 잃는 것

:::evidence key="messaging-cloudevents-c04-diagram" alt="원래 봉투에 occurredAt 과 producedAt 이 있고 왕복 후 봉투에서 producedAt 만 빗금으로 놓인다" caption="봉투가 왕복에서 잃는 것" zoom="false" :::

CloudEvents에는 time 하나뿐이므로 봉투의 두 시각(플랫폼이 봉투를 만든 때 / 사실이 일어난 때)을 구분할 수 없다. 같은 값을 넣는 것은 합리적 선택이지만 정보 손실이 기록되지 않았다 — 왕복 후 producedAt은 원래 값이 아니다.

테스트가 비교하지 않는 필드

왕복 검증(roundTripsBackToAnEnvelopeWithoutInventingATombstone)이 messageId·messageType·schemaVersion·correlationId·tenantContext·payload만 비교하고 producedAt은 비교하지 않는다. fixture에서 producedAt09:15:01Z, occurredAt09:15:00Z일부러 다르게 설정돼 있으므로, 비교했다면 실패했을 것이다.