IBM BPM, V8.0.1, All platforms > Programming IBM BPM > Business rule management programming > Examples

Example 8: Change the default business rule for a business rule group

In this example, the default business rule is changed with another business rule that is part of the available targets list for a specific operation.

package com.ibm.websphere.sample.brules.mgmt;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.ibm.wbiserver.brules.mgmt.BusinessRule;
import com.ibm.wbiserver.brules.mgmt.BusinessRuleGroup;
import com.ibm.wbiserver.brules.mgmt.BusinessRuleManagementException;
import com.ibm.wbiserver.brules.mgmt.BusinessRuleManager;
import com.ibm.wbiserver.brules.mgmt.Operation;
import com.ibm.wbiserver.brules.mgmt.query.QueryOperator;

public class Example8
{
static Formatter out = new Formatter();

static public String executeExample8()
{
		try
		{
				out.clear();

		// Retrieve a business rule group by target namespace and name 		List<BusinessRuleGroup> brgList = BusinessRuleManager
				.getBRGsByTNSAndName(
						"http://BRSamples/com/ibm/websphere
						/sample/brules", 						QueryOperator.EQUAL, 						"DiscountRules", 						QueryOperator.EQUAL, 0, 0);

		if (brgList.size() > 0)
		{
				out.printlnBold("Business Rule Group before publish:");
				// Get the first business rule group from the list
				// This should be the only business rule group in the list as 				// the combination of target namespace and name are unique 				BusinessRuleGroup brg = brgList.get(0);

				out.print("Business Rule Group: ");
				out.println(brg.getName());

				// Get the operation of the business rule group that 				// will have its default business rule updated
				Operation op =
				brg.getOperation("calculateShippingDiscount");

The default business rule is retrieved before it is updated with another rule that is part of the available target list for the operation. Rule sets and decision tables are specific to operations and only those business rule artifacts that are for an operation can be set to be default or be scheduled for another time on the operation.

				// Retrieve the default business rule for the operation 				BusinessRule defaultRule =
				op.getDefaultBusinessRule();
				out.print("Default Rule: ");
				out.println(defaultRule.getName());

				// Get the list of available business rules for this 				operation
				List<BusinessRule> ruleList =
				op.getAvailableTargets();

				Iterator<BusinessRule> iterator =
				ruleList.iterator();
				BusinessRule rule = null;

				// Find a business rule that is different from the 				current
				// default 				// business rule
				while (iterator.hasNext())
				{
						rule = iterator.next();
						if
						(!defaultRule.getName().equals(rule.getName()))
						{

The default business rule is set on the operation object. Setting the default business rule to null will remove any default business rule from the operation, however it is recommended that every operation have a default business rule specified.

								// Set the default business rule to be a 								// different business rule
								// This change is to the operation object 								// directly
								op.setDefaultBusinessRule(rule);
								break;
						} 				} 				// Use the original list or create a new list
				// of business rule groups 				List<BusinessRuleGroup> publishList = new
				ArrayList<BusinessRuleGroup>();
				// Add the changed business rule group to the list
				publishList.add(brg);
				// Publish the list with the updated business rule
				group
				BusinessRuleManager.publish(publishList, true);

				out.println("");

				// Retrieve the business rule groups again to verify the 				// changes were published

				out.printlnBold("Business Rule Group after publish:");
				brgList = BusinessRuleManager
				.getBRGsByTNSAndName(
						"http://BRSamples/com/ibm/websphere/sample/brules", 						QueryOperator.EQUAL, "DiscountRules", 						QueryOperator.EQUAL, 0, 0);

				brg = brgList.get(0);
				out.println("Business Rule Group: " + brg.getName());
				op = brg.getOperation("calculateShippingDiscount");

				// Retrieve the default business rule for the operation 				defaultRule = op.getDefaultBusinessRule();
				out.print("Default Rule: ");
				out.println(defaultRule.getName());
			} 	} catch (BusinessRuleManagementException e)
	{
			e.printStackTrace();
			out.println(e.getMessage());
	}	
	return out.toString();
	} }

Example

Web browser output for example 8.

Executing example8

Business Rule Group before publish:
Business Rule Group: DiscountRules
Default Rule: calculateShippingDiscount

Business Rule Group after publish:
Business Rule Group: DiscountRules
Default Rule: calculateShippingDiscountHoliday

Examples