query

type Handler interface {
	ViewModel() string
	EventQuery(instanceIDs ...string) (*models.SearchQuery, error)
	Reduce(*models.Event) error
	OnError(event *models.Event, err error) error
	OnSuccess() error
	MinimumCycleDuration() time.Duration
	LockDuration() time.Duration
	QueryLimit() uint64

	AggregateTypes() []models.AggregateType
	CurrentSequence(instanceID string) (uint64, error)
	Eventstore() v1.Eventstore

	Subscription() *v1.Subscription
}