TutorialDecisionServices_DecisionTables - uoForms/ebc6230-bpm GitHub Wiki

Decision Tables

This component contains a table, where each row represent a rule. The rules in this table are boolean conditions. If the condition is met, then the rule action which is set in the java script section is executed. This is a standalone component, which can be directly constructed in BPM and associated with any related processes.

The following example shows how decision tables are used to construct boolean conditional rules. Step 1: Navigate to Process Designer. Open the project in which you want to create decision table, which can then be attached to a process. In the designer, Create a new decision service as shown in the below 2 screenshots.

Step 2: In the Diagram section, drag and drop 'Decision table' from the selections seen on the right hand side of the designer screen.

Step 3: This decision table is used to compute the discount for the customers based on the product they purchase from a computer store. So declare the variables suitably as shown in the below screenshot:

Step 4: Under the decision table, write the decision rules and actions for the purchase.

As seen here, a customer gets a discount of 10% if he purchases lenovo laptop alone, 5% of discount if mac book alone is purchased and 25% discount is given if he purchases all three-lenovo,mac and acer laptops at once. So, each of these rules have the action defined, which is written under javascript section as seen in the screenshot.

Step 5: On Debugging this decision table, we see the following results: Here, Lenovo=true,acer=true and mac=true. ie, we assume the customer has purchased all three laptops and find out how much discount should be given to him.

By observing the decision table rules, it is seen that the customer should be give 25% discount if he purchases all three laptops at once. The result is successfully seen in the below screenshot.

Case2: We try to tweak the hardcoded boolean values for the laptop types that flag if that type laptop is purchased or not to observe the output. By setting lenovo=true, mac=acer=false, we should see 10% discount in the output.

Output:

Note: Decision Services can also be integrated with WODM( Websphere Operation Decision Manager)