Files
document-haness/docs/clean-architecture-backend-template/tech-log-studio/state-machines-and-ownership/concept/concept-messaging-schema-avro-c06.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

2.2 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-schema-avro-c06 재사용 자리에 항상 null을 넘겨 공유 상태를 없앤다 state-machines-and-ownership clean-architecture-backend-template 게시 전 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916 concept:messaging-schema-avro-c06 2026-09-01
key file
messaging-schema-avro-c06 ../../../final/evidence/rendered/messaging-schema-avro-c06.svg
../../../final/evidence/raw/messaging-schema-avro-c06.txt
원본 분석 절은 analysis/messaging/messaging-schema-avro.md#L298 이다.
messaging-schema-avro

재사용 자리에 항상 null을 넘겨 공유 상태를 없앤다

AvroMessageCodec은 불변이고, 인코더·디코더·sink가 전부 호출마다 새로 만들어진다.

관계

  • 모드 enum을 분기 조건으로 쓰면 각 분기에 테스트를 둔다 같은 분석 리프에서 끌어낸 규칙이다.
  • 컬렉션 순서가 계약이면 양쪽에서 같은 방향으로 적는다 같은 분석 리프에서 끌어낸 규칙이다.
  • 안정 코드는 판단 단위로 정하고 구현 단위로 정하지 않는다 같은 분석 리프에서 끌어낸 규칙이다.

본문

AvroMessageCodec은 불변이다 — schemasMap.copyOf된 평탄 맵, maxBytes는 int. BoundedByteSink·BinaryEncoder·DatumReader·BinaryDecoder는 전부 호출마다 새로 만들어진다.

AvroMessageCodec 참조 위치

:::evidence key="messaging-schema-avro-c06" alt="코드베이스에서 AvroMessageCodec 를 검색한 출력 21줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="AvroMessageCodec 코드베이스 검색 — 21줄 · exit 0" zoom="true" :::

재사용 자리에 항상 null을 넘긴다

EncoderFactory.get()/DecoderFactory.get()은 Avro의 싱글턴 팩토리이고 스레드 안전하다. 다만 binaryDecoder(encoded, null)의 두 번째 인자가 재사용 decoder 자리인데 항상 null을 넘긴다 — 재사용하지 않으므로 공유 상태가 없다. 성능을 버리고 안전을 택한 형태다. AvroCompatibilityGate는 상태가 없다.