Task 3: Defining the pricing rule task

You define a task for computing rental prices for eligible customers, and run the rules with the RetePlus algorithm.

1. Select the pricing rule task in the ruleflow diagram.
2. In the Properties view, click Rule Selection, and then click Edit.
3. In the Select Rules dialog, select the pricing rule package. Use the arrow to move it to the panel on the side, and then click OK.

   The rule task now includes all the rules in the pricing rule package.

4. In the Properties view, click Rule Task, and for Algorithm, select RetePlus.
   The RetePlus mode is better suited for pricing rules because they use inference. It means that objects in the working memory are modified by the rules and the condition for firing the rules should be reevaluated. For more information on the RetePlus mode, see Engine execution modes.
5. In the Properties view, click Rule Selection and under Choose runtime rule selection, select Static BAL.
6. Enter the following code:

   the pickup date of 'the current rental agreement' is after or the same as 
   the effective date of 'the rule', 
   or by default the start date of the session 
   and
   the pickup date of 'the current rental agreement' is before 
   the expiration date of 'the rule', 
   or by default the end date of the session 
   

   With this runtime rule selection statement, you specify that only the pricing rules that are still in effect and have not expired by the date of the pickup can be evaluated as part of the pricing rule task at run time.

7. In the Properties view, click Final Action, select IRL, and then type the following code:

   java.util.List offersList = new ArrayList(rental.offers); 
      Collections.sort(offersList);
      Iterator it = offersList.iterator();
      while (it.hasNext()) {
         Offer offer = (Offer) it.next();
         session.displayMessage("   * Offer: " + offer);
      } 
   session.displayMessage("   # Best Offer: " + rental.bestOffer);
   

   After you finish executing the rule task, the Console output displays a message that lists the prices of all available offers and shows which one is the best deal for the customer.

8. Because you used IRL for the final action, you must add the imports used for the BOM classes:
   1. Click in an empty part of the ruleflow diagram.
   2. In the Properties view for the ruleflow, click Imports.
   3. Type the following imports:

      import java.util.ArrayList;
      import java.util.Collections;
      import java.util.Iterator;
      import java.time.*;
      import carrental.Offer; 
      use rental;
      use session;
      

9. Save your work.