Caller{{caller}}

Transactional serviceOwns the unit of work.

Primary databaseApplies atomic writes.

ObserverReceives the final transaction state.

Begin

Caller → Transactional service sync Request an atomic operation.

Transactional service → itself self {{begin}}

Atomic writes

Transactional service → Primary database sync {{write-a}}

Transactional service → Primary database sync {{write-b}}

Commit or rollback {{commit-rollback}}

Transactional service → Primary database sync Commit the successful unit of work.

Transactional service → Primary database error Rollback all writes after failure.

Transactional service → Observer async {{observer}}

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