Spantree Drools Examples

Hello World Example

A simple project that changes a message from hello to goodbye using Drools (simplified version of the canonical Drools example)

Pet Store Example

A reimagined Java Pet Store, using Drools to calculate things like discounts, warnings, and sales tax. Refactored and expanded based on use cases defined in canonical Drools example.

Rules Implemented

Notes

• When purchasing freshwater and saltwater fish, warn customer about housing in separate tanks.
• When purchasing new cat, remind customer to purchase cat food.

Promotions & Discounts

• When purchasing new dog and no dog food purchased, add a free sample of dog food to order.
• When purchasing 3 or more fish, get third fish for free.
• When purchasing 10 or more fish, get free aquarium

Sales Tax

• If customer is in Illinois, apply a 6.25% state sales tax.
• If customer is in Chicago and order is before January 1, 2016, apply an additional 3% local sales tax.
• If customer is in Chicago and order is after January 1, 2016, apply an additional 4% local sales tax.

Demo

The below demo shows the pet store Rules engine in action. Chicago-based customer buys the following on January 14, 2016:

• 10 Goldfish
• 2 Clownfish
• 1 Poodle
• 1 Cube Aquarium

After adding the order to the rules engine, the following information is applied to the order:

• Add a free sample bag of Blue Buffalo Lamb & Brown Rice to order and provide a 100% discount.
• Add a note about housing freshwater and saltwater fish in separate tanks.
• Apply a 50% discount on Cube Aquarium.
• Apply a 100% discount to the least expensive fish purchased.
• Apply a state sales tax of 6.25%.
• Apply a local sales tax (at the new higher Chicago rate) of 4%.