Files
document-haness/docs/clean-architecture-backend-template/final/evidence/raw/272-schema-family-reachability.txt
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

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# revision: 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916
## A. who calls the format-independent compatibility engine?
(every hit below is either its own declaration or its own test)
src/messaging/messaging-schema-api/src/main/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidator.java:20:public final class SchemaCompatibilityValidator {
src/messaging/messaging-schema-api/src/main/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidator.java:29: public SchemaCompatibilityValidator(SchemaRegistry registry) {
src/messaging/messaging-schema-api/src/main/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidator.java:42: public List<SchemaVersion> versionsToCheck(String subject) {
src/messaging/messaging-schema-api/src/main/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidator.java:62: public void requireProductionMode(String subject, String destination) {
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:13:class SchemaCompatibilityValidatorTest {
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:39: private static SchemaCompatibilityValidator validator(SchemaCompatibility mode) {
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:40: return new SchemaCompatibilityValidator(new FixedRegistry(List.of(V1, V2, V3), mode));
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:45: assertThat(validator(SchemaCompatibility.BACKWARD).versionsToCheck("order.created"))
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:51: assertThat(validator(SchemaCompatibility.BACKWARD_TRANSITIVE).versionsToCheck("order.created"))
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:59: assertThat(validator(SchemaCompatibility.NONE_EXPERIMENTAL).versionsToCheck("order.created"))
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:65: SchemaCompatibilityValidator validator =
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:66: new SchemaCompatibilityValidator(
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:69: assertThat(validator.versionsToCheck("order.created")).isEmpty();
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:77: .requireProductionMode("order.created", "orders.v1"))
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:87: .requireProductionMode("order.created", "orders.v1"))
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:93: assertThat(SchemaCompatibilityValidator.checksBackward(SchemaCompatibility.FULL)).isTrue();
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:94: assertThat(SchemaCompatibilityValidator.checksForward(SchemaCompatibility.FULL)).isTrue();
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:99: assertThat(SchemaCompatibilityValidator.checksForward(SchemaCompatibility.BACKWARD)).isFalse();
src/messaging/messaging-schema-api/src/test/java/dev/caskeleton/messaging/schema/SchemaCompatibilityValidatorTest.java:100: assertThat(SchemaCompatibilityValidator.checksBackward(SchemaCompatibility.FORWARD)).isFalse();
## B. the duplication that engine's javadoc exists to prevent
--- schema-api: allowlist form
public static boolean checksBackward(SchemaCompatibility mode) {
Objects.requireNonNull(mode, "mode must not be null");
return mode == SchemaCompatibility.BACKWARD
|| mode == SchemaCompatibility.BACKWARD_TRANSITIVE
|| mode == SchemaCompatibility.FULL
|| mode == SchemaCompatibility.FULL_TRANSITIVE;
}
/**
* Reports whether older readers must be able to read data written by the candidate.
*
* @param mode the compatibility mode
* @return true when the forward direction is enforced
*/
public static boolean checksForward(SchemaCompatibility mode) {
Objects.requireNonNull(mode, "mode must not be null");
return mode == SchemaCompatibility.FORWARD
|| mode == SchemaCompatibility.FORWARD_TRANSITIVE
|| mode == SchemaCompatibility.FULL
|| mode == SchemaCompatibility.FULL_TRANSITIVE;
}
/**
* Reports whether a mode compares against the whole history.
*
* @param mode the compatibility mode
* @return true for the transitive modes
*/
public static boolean isTransitive(SchemaCompatibility mode) {
Objects.requireNonNull(mode, "mode must not be null");
return mode == SchemaCompatibility.BACKWARD_TRANSITIVE
|| mode == SchemaCompatibility.FORWARD_TRANSITIVE
|| mode == SchemaCompatibility.FULL_TRANSITIVE;
}
--- schema-avro: private denylist form
private static boolean isTransitive(SchemaCompatibility mode) {
return mode == SchemaCompatibility.BACKWARD_TRANSITIVE
|| mode == SchemaCompatibility.FORWARD_TRANSITIVE
|| mode == SchemaCompatibility.FULL_TRANSITIVE;
}
private static boolean readsBackward(SchemaCompatibility mode) {
return mode != SchemaCompatibility.FORWARD && mode != SchemaCompatibility.FORWARD_TRANSITIVE;
}
private static boolean readsForward(SchemaCompatibility mode) {
return mode != SchemaCompatibility.BACKWARD && mode != SchemaCompatibility.BACKWARD_TRANSITIVE;
}
## C. the platform's own SchemaRegistry port: any importer?
exit=1 (1 = no importer anywhere)
--- the SchemaRegistry name that IS imported elsewhere is a different type:
src/adapter/outbound/messaging/src/main/java/dev/caskeleton/adapter/outbound/messaging/envelope/LocalJsonSchemaRegistry.java:6:import com.networknt.schema.SchemaRegistry;
src/adapter/outbound/notification/src/main/java/dev/caskeleton/adapter/outbound/notification/platform/template/JsonSchemaVariableValidator.java:5:import com.networknt.schema.SchemaRegistry;
## D. codec consumers outside their owning leaf
JacksonMessageCodec src/messaging/messaging-spring-boot-starter/src/main/java/dev/caskeleton/messaging/autoconfigure/MessagingCoreAutoConfiguration.java
AvroMessageCodec NONE
AvroCompatibilityGate NONE
ProtobufMessageCodec NONE
ProtobufMessageContract NONE
RawBytesMessageCodec NONE
CloudEventMapper NONE
DefaultCloudEventMapper NONE
CloudEventExtensions NONE
## E. registry membership of the codec leaves (does shipping match usage?)
messaging-schema-api runtime_memberships=['app-bootstrap']
messaging-schema-json runtime_memberships=['app-bootstrap']
messaging-schema-avro runtime_memberships=[]
messaging-schema-protobuf runtime_memberships=[]
messaging-cloudevents runtime_memberships=['app-bootstrap']
## F. the raw-bytes default rule is enforced by content type, not by class
52: if (ContentType.OCTET_STREAM.equals(defaultCodec.contentType())) {