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// Package handling provides the use-case for registering incidents. Used by
// views facing the people handling the cargo along its route.
package handling
import (
// ErrInvalidArgument is returned when one or more arguments are invalid.
var ErrInvalidArgument = errors.New("invalid argument")
// EventHandler provides a means of subscribing to registered handling events.
type EventHandler interface {
// Service provides handling operations.
type Service interface {
// RegisterHandlingEvent registers a handling event in the system, and
// notifies interested parties that a cargo has been handled.
RegisterHandlingEvent(completed time.Time, id cargo.TrackingID, voyageNumber voyage.Number,
unLocode location.UNLocode, eventType cargo.HandlingEventType) error
type service struct {
handlingEventRepository cargo.HandlingEventRepository
handlingEventFactory cargo.HandlingEventFactory
handlingEventHandler EventHandler
func (s *service) RegisterHandlingEvent(completed time.Time, id cargo.TrackingID, voyageNumber voyage.Number,
loc location.UNLocode, eventType cargo.HandlingEventType) error {
if completed.IsZero() || id == "" || loc == "" || eventType == cargo.NotHandled {
return ErrInvalidArgument
e, err := s.handlingEventFactory.CreateHandlingEvent(time.Now(), completed, id, voyageNumber, loc, eventType)
if err != nil {
return err
return nil
// NewService creates a handling event service with necessary dependencies.
func NewService(r cargo.HandlingEventRepository, f cargo.HandlingEventFactory, h EventHandler) Service {
return &service{
handlingEventRepository: r,
handlingEventFactory: f,
handlingEventHandler: h,
type handlingEventHandler struct {
InspectionService inspection.Service
func (h *handlingEventHandler) CargoWasHandled(event cargo.HandlingEvent) {
// NewEventHandler returns a new instance of a EventHandler.
func NewEventHandler(s inspection.Service) EventHandler {
return &handlingEventHandler{
InspectionService: s,
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