📜 START
There is a major new technology that is destined to be a disruptive force in the field of transportation: the drone. Just as the mobile phone allowed developing countries to leapfrog older technologies for personal communication, the drone has the potential to leapfrog traditional transportation infrastructure.
Useful drone functions include delivery of small items that are (urgently) needed in locations with difficult access.
We have a fleet of 10 drones. A drone is capable of carrying devices, other than cameras, and capable of delivering small loads. For our use case the load is medications.
A Drone has:
- serial number (100 characters max);
- model (Lightweight, Middleweight, Cruiserweight, Heavyweight);
- weight limit (500gr max);
- battery capacity (percentage);
- state (IDLE, LOADING, LOADED, DELIVERING, DELIVERED, RETURNING).
Each Medication has:
- name (allowed only letters, numbers, ‘-‘, ‘_’);
- weight;
- code (allowed only upper case letters, underscore and numbers);
- image (picture of the medication case).
Develop a service via REST API that allows clients to communicate with the drones (i.e. dispatch controller). The specific communicaiton with the drone is outside the scope of this task.
The service should allow:
- registering a drone;
- loading a drone with medication items;
- checking loaded medication items for a given drone;
- checking available drones for loading;
- check drone battery level for a given drone;
Feel free to make assumptions for the design approach.
While implementing your solution please take care of the following requirements:
- There is no need for UI;
- Prevent the drone from being loaded with more weight that it can carry;
- Prevent the drone from being in LOADING state if the battery level is below 25%;
- Introduce a periodic task to check drones battery levels and create history/audit event log for this.
- Input/output data must be in JSON format;
- Your project must be buildable and runnable;
- Your project must have a README file with build/run/test instructions (use DB that can be run locally, e.g. in-memory, via container);
- Required data must be preloaded in the database.
- JUnit tests are optional but advisable (if you have time);
- Advice: Show us how you work through your commit history.
- A favourite code editor IDE (IntelliJ IDEA or Eclipse)
- JDK 1.8 or later
- Gradle 4+ or Maven 3.2+
- Postman (For testing APIs)
-
Clone the git repository
-
Open the cloned project in your editor or IDE
-
Update the Maven dependencies
-
Build the project and run
-
You can run the JUnit test cases to assert that everything is working correctly before proceeding
- Assumption made: Multiple medicines can be loaded to a drone as long as list items do not exceed the weight limit of the drone
- ContentType is application/json
- Base URL: http://localhost:8080/api/
Endpoint: POST /drone/register
The payload should be in json as shown below
- serialNumber of Drone (100 characters max)
- model (Lightweight, Middleweight, Cruiserweight, Heavyweight)
- weightlimit (Maximum 500)
- batteryCapacity (Maximum 100)
- state (IDLE, LOADING, LOADED, DELIVERING, DELIVERED
{
"serialNumber": "DRZ6KULBUA9S",
"model": "Lightweight",
"weightLimit": 450,
"batteryCapacity": 64,
"state": "IDLE"
} Success Response
{
"status": "success",
"message": "Drone registered successfully",
"data": {
"serialNumber": "DRZ6KULBUA9S",
"model": "Lightweight",
"weightLimit": 450.0,
"batteryCapacity": 64.0,
"state": "IDLE"
}
}Error response
{
"status": "error",
"message": "An error occurred whiles validating data!",
"data": {
"model": "must not be empty",
"weightLimit": "Weight limit can be 500 gram maximum"
}
}Endpoint: POST /medication/register
The payload should be in json as shown below
- name (allowed only letters, numbers, hyphen, and underscore)
- code (allowed only letters, numbers, and underscore);
- weight
- image
{
"name": "Paracetamol",
"code": "LBUA9S",
"weight": 250,
"image": "paracetamol.png"
}
Success Response
{
"status": "success",
"message": "Medication created successfully",
"data": {
"name": "Paracetamol",
"weight": 250.0,
"code": "LBUA9S",
"image": "paracetamol.png"
}
}Error Response
{
"status": "error",
"message": "An error occurred whiles validating data!",
"data": {
"code": "Allowed only upper case letters, underscore and numbers",
"name": "Allowed only letters, numbers, hyphen and underscore"
}
}Endpoint: GET /medication/list
Response
{
"status": "success",
"message": "Medication created successfully",
"data": {
"name": "Paracetamol",
"weight": 250.0,
"code": "LBUA9S",
"image": "paracetamol.png"
}
}Endpoint: GET /drone/available
Response
{
"status": "success",
"message": "Available drones loaded successfully",
"data": [
{
"serialNumber": "DRZ6KULBUA9S",
"model": "Lightweightd",
"weightLimit": 450.0,
"batteryCapacity": 64.0,
"state": "IDLE"
}
]
}Endpoint: POST /delivery/load
The payload should be in json as shown below
- serialNumber of Drone (100 characters max)
- medications (List of medication codes - Drones can handle more than one item)
- source (Point of departure)
- destination (Point of Arrival)
{
"serialNumber": "DRZ6KULBUA9S",
"medications": [
"LBUA9S"
],
"source": "Plovdiv",
"destination": "Sofia"
} Success Response
{
"status": "success",
"message": "Drone loaded successfully",
"data": {
"delivery": {
"id": 2,
"drone": "DRZ6KULBUA9S",
"source": "Plovdiv",
"destination": "Sofia",
"createdAt": "2022-05-30T18:46:45.174372Z",
"dispatchedAt": null,
"deliveredAt": null
},
"items": [
{
"id": 2,
"deliveryId": 2,
"medication": "LBUA9S"
}
],
"timestamp": "2022-05-30T18:46:45.178499Z"
}
}Error Response
{
"status": "error",
"message": "Drone is not available! State: LOADED",
"data": {
"serialNumber": "DRZ6KULBUA9S",
"model": "Lightweight",
"weightLimit": 450.0,
"batteryCapacity": 64.0,
"state": "LOADED"
}
}Endpoint: GET /delivery/items/{serialNumber}
Response
{
"status": "success",
"message": "Drone items loaded successfully",
"data": {
"delivery": {
"id": 1,
"drone": "DRZ6KULBUA9S",
"source": "Plovdiv",
"destination": "Sofia",
"createdAt": "2022-05-30T19:23:53.938253Z",
"dispatchedAt": null,
"deliveredAt": null
},
"items": [
{
"name": "Paracetamol",
"weight": 250.0,
"code": "LBUA9S",
"image": "paracetamol.png"
}
]
}
}Endpoint: POST /delivery/dispatch
The payload should be in json as shown below
- serialNumber of Drone (100 characters max)
{
"serialNumber": "DRZ6KULBUA9S"
} Success Response
{
"status": "success",
"message": "Drone dispatched successfully",
"data": {
"delivery": {
"id": 1,
"drone": "DRZ6KULBUA9S",
"source": "Plovdiv",
"destination": "Sofia",
"createdAt": "2022-05-30T19:23:53.938253Z",
"dispatchedAt": "2022-05-30T19:25:41.566389Z",
"deliveredAt": null
},
"items": [
{
"id": 1,
"deliveryId": 1,
"medication": "LBUA9S"
}
],
"timestamp": "2022-05-30T19:25:41.567619Z"
}
}Error Response
{
"status": "error",
"message": "No delivery for drone with serial number DRZ6KULBUA9S!",
"data": null
}Endpoint: POST /delivery/delivered
The payload should be in json as shown below
- serialNumber of Drone (100 characters max)
{
"serialNumber": "DRZ6KULBUA9S"
} Success Response
{
"status": "success",
"message": "Drone delivered successfully",
"data": {
"delivery": {
"id": 1,
"drone": "DRZ6KULBUA9S",
"source": "Plovdiv",
"destination": "Sofia",
"createdAt": "2022-05-30T19:23:53.938253Z",
"dispatchedAt": "2022-05-30T19:25:41.562477Z",
"deliveredAt": "2022-05-30T19:27:20.441577Z"
},
"items": [
{
"id": 1,
"deliveryId": 1,
"medication": "LBUA9S"
}
],
"timestamp": "2022-05-30T19:27:20.442013Z"
}
}Error Response
{
"status": "error",
"message": "No delivery for drone with serial number DRZ6KULBUA9S!",
"data": null
}
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