pattern-command

Undo and redo operations are implemented by encapsulating mutable actions into command objects with execution and undo helpers. State snapshots captured during command execution allow operations to be reversed or re-applied, keeping callers decoupled from business logic.

The command pattern translates mutable operations into stand-alone command objects. This allows callers to queue, log, and undo complex domain actions without entangling invokers or triggers in the underlying business logic.

Decoupling is achieved by defining command interfaces, concrete commands, invokers, and receivers. This structure keeps triggers, queues, or audit logs completely separated from the actual operation execution and domain state changes.

You should avoid the command pattern for simple, direct operations that do not require undoable operations, task queues, or deferred execution. Overhead from command interfaces and state snapshots is unnecessary without auditing or transactional rollback needs.

Yes, the command pattern supports transactional outbox flows by keeping audit logs and triggers decoupled from actual operations. Command history can drive undo or redo flows, ensuring deferred execution scenarios remain reversible and logged.