type AccountAggregate struct {
  cmdHandlers map[string]CommandHandler
  evHandlers map[string]EventHandler
}
func NewAccountAggregate() Aggregate {
  a := &AccountAggregate{}
  a.cmdHandlers = map[string]CommandHandler{
    "CreateAccount": a.createAccount,
  }
  a.evHandlers = map[string]EventHandler{
    "AccountCreated": a.onAccountCreated,
  }
  return a
}
func (a *AccountAggregate) createAccount(cmd Command) error {
  ev := Event{"AccountCreated", cmd.Payload}
  a.Causes(ev)
  return nil
}
func (a *AccountAggregate) onAccountCreated(ev Event) {
  // persisting of data
}
func (a *AccountAggregate) Load(events []Event) { … }
func (a *AccountAggregate) Process(cmd Command) error { … }
func (a *AccountAggregate) Causes(ev Event) { … }