NewCommandBus creates a new instance of CommandBus.

NewQueryBus creates a new instance of QueryBus.

ErrCommandHandlerNotFound represents the "command handler not found" error.

ErrQueryHandlerNotFound represents the "query handler not found" error.

ErrUnexpectedCommand represents the "unexpected command" error.

ErrUnexpectedQuery represents the "unexpected query" error.

CommandBus represents the command bus.

QueryBus represents the query bus.

Command represents the interface for commands.

CommandHandler represents the interface for a command handler.

Query represents the interface for queries.

QueryHandler represents the interface for a query handler.

CommandType represents the type of a command.

QueryType represents the type of a query.