You are asked to design a software package for the robotic floor sweeper (RFS). The RFS will take commands from its user. The commands include clean floor with various types such as wooden floor, marble floor, carpeted floor); clean floors on House xxx, House xxx may have number of floors, floor types, floor size, floor shapes, etc..; clean the floor in mm minutes. When the debris collector is full, a software entity will notify the user to take action. When the operating hours is over the threshold, a software entity will ask the owner for maintenance.

First and the most important is to understand the requirements as stated above (customers mission statement).

In the OOD&A course, you were taught to go through steps as outlined below to design a system. (For the interest of time allocated for final exam, we skip some of the steps.)

Step1. Identify the actors and the software entities for the system to be implemented.

Step2. Describe 3 to 5 Customer/Business Use Cases.

Step 3.Derive User Interface from the Business Use Cases. Draw a few user interface sketches.

Step 4.Draw a Use Case Diagram which consists of 3 to 5 use cases defined in Step 2.

Step 5. Create Classes from Actors and Entities.

Step 6. Write attributes and Operations (Methods) for each Class. The Operations are derived from Activities in the system.

Step 7. Draw communication diagrams for the Use cases you defined in Step 2 and 4. This step is called Use Case Realization.

Step 8. Now you are at System Design Stage to make technology, and topology choices.

Step 9. Based on your choices in Step 8, you may pick out network subsystem and database subsystem. For example the database can be imbedded, local, or remote. Explain their pros and cons for your database location choice.

Step 10. Based on the attributes you defined in Step 6, sketch relational Tables (Database Schema) to be used by the RFS.

Step 11. Based on your choice in Subsystem design, draw a ServletsLayer Class Diagram which contains the subsystem artifacts required to support the customer/business service realization and the user client.

There is another device designed to clean the windows, it is called Robotic Window Sweeper, RWS for short. In your opinion, which part of the software package in RFS can be reused in RWS? Which can not be reused?

From hardware point of view, the device may have multi-legs so that it can go from one piece of the window to another piece; or the device can be a cleaning broom installed on a drone with operator on the cleaning site.