Shop Tracking Simulation

This program simulates work of the shop merchandiser and track all of his moves.

The first solution about paking items on the shelf (in our case 2D bin packing problem) is to use shelf algorithm wich is more preferable for perfomance at my point of view.

Technology stack:

• Spring boot
• Google Guava lib
• Spring data JPA
Database:
• Postgresql
• Liqubase
• Hibernate envers
Logging:
• Log4j
• SL4j
Spicing:
• Lombok
Testing:
• JUnit 5
• Mockito
CI CD tools used:
• Jenkins
• SonarQube
Documentation:
• Swagger

The algorithm i used in my case is customised NFDH (Next Fit Decreasing High) packing algorithm:

1. For each rectangle in the list of strings to pack:
   1. If the rectangle does not fit in the current shelf:
      1. Close the current shelf.
      2. Open a new shelf with self height 0 and position of previous shelf level.
   2. Add the rectangle to the current shelf.
      1. If the rectangle’s height is greater than the shelf’s height:
         1. Set the shelf height to the rectangle’s height.