exercise2-package-tracker

Exercise 2 - Parcel tracker

In this exercise you will be creating a parcel tracker. Some code is provided as a starting point.

1. Parcel tracker system description

Tracker events

There are 3 events in the system:

• ParcelRegistered (fields: parcelId, timestamp, fromLocation, toLocation)
• ParcelScanned (fields: parcelId, timestamp, location)
• ParcelDelivered (fields: parcelId, timestamp, location, status))

The ParcelTracker interface

The example code contains an interface called ParcelTracker:

public interface ParcelTracker {
    public String getParcelStatusForParcelId(String parcelId);
    public void handleNewParcelStatus(ParcelStatus parcelStatus);
}

2. Assignment

• Create an implementation of the ParcelTracker interface
• Extend the ParcelTracker to do the following:
  • Assign a unique ID to a parcel
  • Send a parcel from a post office to another.
  • Keep track of status changes (sent, scanned, received)
  • Register several parcel
  • Keep track of delivered parcel
• The getParcelStatusForParcelId method should return the following depending on parcel status:
  • ParcelRegistered => “Parcel is registered”
  • ParcelScanned (location != {To}) => “Parcel last seen at {Location}”
  • ParcelScanned (location == {To}) => “Parcel ready to be picked up”
  • ParcelDelivered => “Parcel delivered”
• Write tests
• Create a console application that calls your ParcelTracker class