5.1. CDA

Detailed Design & Implementation: Communication lifecycle contracts dimpl~communication-control-contracts

local-url: ../workspace/cda-interfaces/src/communication_control#L16; remote-url: cda-interfaces/src/communication_control.rs#L16; links incoming: arch~dt-deferred-initialization, arch~dt-post-update-deferred-communication

Detailed Design & Implementation: Capability-limited diagnostic communication access dimpl~communication-control-access

local-url: ../workspace/cda-interfaces/src/communication_control/access#L16; remote-url: cda-interfaces/src/communication_control/access.rs#L16; links incoming: arch~dt-deferred-initialization

Detailed Design & Implementation: Authoritative communication lifecycle operations dimpl~communication-control-operations

local-url: ../workspace/cda-interfaces/src/communication_control/operation#L16; remote-url: cda-interfaces/src/communication_control/operation.rs#L16; links incoming: arch~dt-deferred-initialization

Unit Test: Recovery discards an incomplete transaction that crashed while still recording test~storage-atomicity-recovery-discards-recording-phase-crash

local-url: ../workspace/cda-storage/tests/recovery#L27; remote-url: cda-storage/tests/recovery.rs#L27; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: Systemd Watchdog Integration dimpl~system-sd-notify-watchdog-integration

local-url: ../workspace/cda-extra/src/systemd_notify#L31; remote-url: cda-extra/src/systemd_notify.rs#L31; links incoming: arch~system-sd-notify-watchdog-integration

Detailed Design & Implementation: Local filesystem implementation of the Storage Access API dimpl~storage-local-filesystem-implementation

local-url: ../workspace/cda-storage/src/local_storage#L40; remote-url: cda-storage/src/local_storage.rs#L40; links incoming: arch~system-storage-access-abstraction

Integration Test: Version Endpoint Integration Test itest~sovd-api-version-endpoint

local-url: ../workspace/integration-tests/tests/sovd/version_endpoint#L45; remote-url: integration-tests/tests/sovd/version_endpoint.rs#L45;

Detailed Design & Implementation: Default deferred communication policy dimpl~default-communication-policy

local-url: ../workspace/cda-plugin-communication-management/src/plugin/default#L51; remote-url: cda-plugin-communication-management/src/plugin/default.rs#L51; links incoming: arch~dt-deferred-initialization, arch~dt-variant-detection

Detailed Design & Implementation: GET /components/{ecu} SDG handler dimpl~sovd-api-component-sdgsd

local-url: ../workspace/cda-sovd/src/sovd/components/ecu#L53; remote-url: cda-sovd/src/sovd/components/ecu.rs#L53; links incoming: arch~sovd-api-component-sdgsd

Detailed Design & Implementation: Write-ahead log with checksum-verified one-phase commit dimpl~storage-wal-journaling

local-url: ../workspace/cda-storage/src/lib#L63; remote-url: cda-storage/src/lib.rs#L63; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: Serialized communication lifecycle controller dimpl~communication-lifecycle-controller

local-url: ../workspace/cda-plugin-communication-management/src/lifecycle/controller#L66; remote-url: cda-plugin-communication-management/src/lifecycle/controller.rs#L66; links incoming: arch~dt-deferred-initialization, arch~dt-post-update-deferred-communication

Detailed Design & Implementation: Startup recovery of interrupted transactions from the WAL dimpl~storage-crash-recovery

local-url: ../workspace/cda-storage/src/recovery#L68; remote-url: cda-storage/src/recovery.rs#L68; links incoming: arch~system-storage-access-abstraction

Unit Test: Recovery restores the original file from its backup after an interrupted overwrite test~storage-atomicity-recovery-restores-overwritten-file

local-url: ../workspace/cda-storage/tests/recovery#L72; remote-url: cda-storage/tests/recovery.rs#L72; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: Starts HTTP Server (TCP or Unix domain socket) dimpl~sovd-api-http-server

local-url: ../workspace/cda-sovd/src/lib#L77; remote-url: cda-sovd/src/lib.rs#L77; links incoming: arch~sovd-api-http-server

Unit Test: Recovery removes a newly-written file left by an interrupted commit with no backup to restore test~storage-atomicity-recovery-removes-new-file

local-url: ../workspace/cda-storage/tests/recovery#L112; remote-url: cda-storage/tests/recovery.rs#L112; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: Deferred diagnostic request admission dimpl~deferred-sovd-admission

local-url: ../workspace/cda-sovd/src/sovd#L143; remote-url: cda-sovd/src/sovd.rs#L143; links incoming: arch~dt-deferred-initialization

Unit Test: Recovery removes an empty collection directory left by an interrupted `CreateCollection` commit test~storage-atomicity-recovery-removes-new-collection

local-url: ../workspace/cda-storage/tests/recovery#L149; remote-url: cda-storage/tests/recovery.rs#L149; links incoming: arch~system-storage-access-abstraction

Integration Test: On-demand requests report pending before activation completes itest~deferred-on-demand-pending

local-url: ../workspace/integration-tests/tests/sovd/deferred_init#L163; remote-url: integration-tests/tests/sovd/deferred_init.rs#L163; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Detailed Design & Implementation: PUT endpoint for ECU variant detection dimpl~sovd-api-ecu-variant-detection

local-url: ../workspace/cda-sovd/src/sovd/components/ecu#L175; remote-url: cda-sovd/src/sovd/components/ecu.rs#L175; links incoming: arch~sovd-api-ecu-variant-detection

Unit Test: Recovery cleans up orphaned backup files left after a successful commit test~storage-atomicity-recovery-cleans-orphaned-backups

local-url: ../workspace/cda-storage/tests/recovery#L179; remote-url: cda-storage/tests/recovery.rs#L179; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: Deferred diagnostic transport activation dimpl~deferred-doip-transport

local-url: ../workspace/cda-comm-doip/src/lib#L189; remote-url: cda-comm-doip/src/lib.rs#L189; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Unit Test: Systemd Watchdog Health Aggregation Tests test~system-sd-notify-watchdog-integration

local-url: ../workspace/cda-extra/src/systemd_notify#L195; remote-url: cda-extra/src/systemd_notify.rs#L195; links incoming: arch~system-sd-notify-watchdog-integration

Integration Test: End-to-end GET/POST over a Unix domain socket bound webserver itest~sovd-api-http-server-unix-socket

local-url: ../workspace/integration-tests/tests/sovd/custom_routes#L198; remote-url: integration-tests/tests/sovd/custom_routes.rs#L198;

Unit Test: Recovery discards a WAL with a corrupt checksum during the recording phase test~storage-atomicity-recovery-discards-corrupt-wal

local-url: ../workspace/cda-storage/tests/recovery#L211; remote-url: cda-storage/tests/recovery.rs#L211; links incoming: arch~system-storage-access-abstraction

Unit Test: Eager and on-demand modes admit communication activation test~deferred-admitting-modes-activate

local-url: ../workspace/cda-plugin-communication-management/src/plugin/default#L231; remote-url: cda-plugin-communication-management/src/plugin/default.rs#L231; links incoming: arch~dt-deferred-initialization

Detailed Design & Implementation: Post-update deferred communication handling dimpl~post-update-deferred-communication

local-url: ../workspace/cda-plugin-runtime-update/src/operations/executions#L239; remote-url: cda-plugin-runtime-update/src/operations/executions.rs#L239; links incoming: arch~dt-post-update-deferred-communication

Integration Test: On-demand startup sends no UDS request before an authorized trigger itest~deferred-on-demand-uds-silence

local-url: ../workspace/integration-tests/tests/sovd/deferred_init#L239; remote-url: integration-tests/tests/sovd/deferred_init.rs#L239; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Unit Test: Recovery fully rolls back a multi-operation transaction that created a collection and wrote into it test~storage-atomicity-recovery-removes-orphaned-collection-dir

local-url: ../workspace/cda-storage/tests/recovery#L247; remote-url: cda-storage/tests/recovery.rs#L247; links incoming: arch~system-storage-access-abstraction

Unit Test: Disabled mode rejects communication activation test~deferred-disabled-rejects-activation

local-url: ../workspace/cda-plugin-communication-management/src/plugin/default#L250; remote-url: cda-plugin-communication-management/src/plugin/default.rs#L250; links incoming: arch~dt-deferred-initialization

Unit Test: Nonblocking activation follows the configured initialization mode test~deferred-request-activation-policy

local-url: ../workspace/cda-plugin-communication-management/src/plugin/default#L268; remote-url: cda-plugin-communication-management/src/plugin/default.rs#L268; links incoming: arch~dt-deferred-initialization

Detailed Design & Implementation: Atomic commit of a staged transaction via WAL and backup-rename dimpl~storage-atomic-commit

local-url: ../workspace/cda-storage/src/local_storage#L290; remote-url: cda-storage/src/local_storage.rs#L290; links incoming: arch~system-storage-access-abstraction

Integration Test: Deferred post-update mode requires communication reactivation itest~deferred-post-update

local-url: ../workspace/integration-tests/tests/sovd/deferred_init#L327; remote-url: integration-tests/tests/sovd/deferred_init.rs#L327; links incoming: arch~dt-post-update-deferred-communication

Detailed Design & Implementation: GET /data/{service} SDG handler dimpl~sovd-api-component-data-sdgsd

local-url: ../workspace/cda-sovd/src/sovd/components/ecu/data#L329; remote-url: cda-sovd/src/sovd/components/ecu/data.rs#L329; links incoming: arch~sovd-api-component-sdgsd

Detailed Design & Implementation: Deferred communication startup wiring dimpl~deferred-communication-startup

local-url: ../workspace/cda-main/src/setup#L407; remote-url: cda-main/src/setup.rs#L407; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Integration Test: Disabled mode rejects request activation and sends no UDS request itest~deferred-disabled-uds-silence

local-url: ../workspace/integration-tests/tests/sovd/deferred_init#L439; remote-url: integration-tests/tests/sovd/deferred_init.rs#L439; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Unit Test: WAL entries round-trip through checksum-verified encode/decode test~storage-wal-checksum-round-trip

local-url: ../workspace/cda-storage/tests/general#L486; remote-url: cda-storage/tests/general.rs#L486; links incoming: arch~system-storage-access-abstraction

Unit Test: WAL reader detects and stops at a truncated entry test~storage-wal-truncation-detection

local-url: ../workspace/cda-storage/tests/general#L547; remote-url: cda-storage/tests/general.rs#L547; links incoming: arch~system-storage-access-abstraction

Detailed Design & Implementation: GET /operations/{service} SDG handler dimpl~sovd-api-component-operations-sdgsd

local-url: ../workspace/cda-sovd/src/sovd/components/ecu/operations#L555; remote-url: cda-sovd/src/sovd/components/ecu/operations.rs#L555; links incoming: arch~sovd-api-component-sdgsd

Unit Test: Binds the server to a unix domain socket and reaches it test~sovd-api-http-server-unix-socket-bind

local-url: ../workspace/cda-sovd/src/lib#L556; remote-url: cda-sovd/src/lib.rs#L556;

Unit Test: Binds the server to a TCP host/port and reaches it test~sovd-api-http-server-tcp-bind

local-url: ../workspace/cda-sovd/src/lib#L569; remote-url: cda-sovd/src/lib.rs#L569;

Unit Test: Successful apply leaves communication disabled in deferred post-update mode test~deferred-post-update-apply

local-url: ../workspace/cda-plugin-runtime-update/src/operations/executions#L581; remote-url: cda-plugin-runtime-update/src/operations/executions.rs#L581; links incoming: arch~dt-post-update-deferred-communication

Detailed Design & Implementation: Register Version Endpoint dimpl~sovd-api-version-endpoint

local-url: ../workspace/cda-main/src/lib#L588; remote-url: cda-main/src/lib.rs#L588; links incoming: arch~sovd-api-version-registration-function

Integration Test: Disabled automatic variant detection permits an explicit ECU trigger itest~variant-detection-explicit

local-url: ../workspace/integration-tests/tests/sovd/deferred_init#L596; remote-url: integration-tests/tests/sovd/deferred_init.rs#L596; links incoming: arch~dt-variant-detection

Unit Test: Removes a stale unix socket file left by an unclean shutdown before binding test~sovd-api-http-server-unix-socket-stale-cleanup

local-url: ../workspace/cda-sovd/src/lib#L603; remote-url: cda-sovd/src/lib.rs#L603;

Unit Test: Successful rollback leaves communication disabled in deferred post-update mode test~deferred-post-update-rollback

local-url: ../workspace/cda-plugin-runtime-update/src/operations/executions#L608; remote-url: cda-plugin-runtime-update/src/operations/executions.rs#L608; links incoming: arch~dt-post-update-deferred-communication

Unit Test: Fails cleanly when a stale unix socket path can't be removed test~sovd-api-http-server-unix-socket-stale-cleanup-failure

local-url: ../workspace/cda-sovd/src/lib#L620; remote-url: cda-sovd/src/lib.rs#L620;

Unit Test: Startup activates communication only in Always mode test~deferred-startup-policy

local-url: ../workspace/cda-main/src/setup#L673; remote-url: cda-main/src/setup.rs#L673; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization

Unit Test: Deferred communication modes are configurable test~deferred-communication-config

local-url: ../workspace/cda-main/src/config/configfile#L1053; remote-url: cda-main/src/config/configfile.rs#L1053; links incoming: arch~dt-deferred-initialization, arch~dt-post-update-deferred-communication

Integration Test: ECU-level SDG retrieval itest~sovd-api-component-sdgsd

local-url: ../workspace/integration-tests/tests/sovd/ecu#L1187; remote-url: integration-tests/tests/sovd/ecu.rs#L1187; links incoming: arch~sovd-api-component-sdgsd

Integration Test: ECU-level SDG retrieval (alias param) itest~sovd-api-component-alias-sdgsd

local-url: ../workspace/integration-tests/tests/sovd/ecu#L1288; remote-url: integration-tests/tests/sovd/ecu.rs#L1288; links incoming: arch~sovd-api-component-sdgsd

Integration Test: Data-level SDG retrieval itest~sovd-api-component-data-sdgsd

local-url: ../workspace/integration-tests/tests/sovd/ecu#L1329; remote-url: integration-tests/tests/sovd/ecu.rs#L1329; links incoming: arch~sovd-api-component-sdgsd

Integration Test: Operation-level SDG retrieval itest~sovd-api-component-operations-sdgsd

local-url: ../workspace/integration-tests/tests/sovd/ecu#L1405; remote-url: integration-tests/tests/sovd/ecu.rs#L1405; links incoming: arch~sovd-api-component-sdgsd

Unit Test: Failed deferred activation can be retried test~deferred-activation-retry

local-url: ../workspace/cda-plugin-communication-management/src/lifecycle/controller#L1436; remote-url: cda-plugin-communication-management/src/lifecycle/controller.rs#L1436; links incoming: arch~dt-deferred-initialization

Unit Test: Deferred request admission triggers activation and returns a retry hint test~deferred-sovd-admission

local-url: ../workspace/cda-sovd/src/sovd#L1460; remote-url: cda-sovd/src/sovd.rs#L1460; links incoming: arch~dt-deferred-initialization

Unit Test: Gateway construction does not bind its discovery socket test~deferred-doip-passive-construction

local-url: ../workspace/cda-comm-doip/src/lib#L1472; remote-url: cda-comm-doip/src/lib.rs#L1472; links incoming: arch~dt-startup-sequence, arch~dt-deferred-initialization