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This guide demonstrates a service for getting quotations, which uses business rules for creating quotations.

Note

Before executing this sample, it is recommended that you refer to section Exposing Rules as Services which explains in detail the process of writing and deploying a business rule.

Sample Rule Definition

Rules

Rule 1: If the customer has bronze status, then the item costs five dollars.

Rule 2 : If the customer has silver status, then the item costs four dollars.

Rule 3 : If the customer has gold status, then the item costs three dollars.

Facts

There is one fact, which is "A customer made a get quote request". Quotation is to capture the result of the rules execution.

 package samples.userguide;

 package samples.quotation;

 /**
  * Customer fact
 */
 public class Customer {

    private String status;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
 }

 package samples.quotation;

 /**
  * Quotation result
 */
 public class Quotation {

    private int price;

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
            this.price = price;
    }
 }

Rule Service Configuration (service.rsl)

<ruleService
        name="GetQuoteService"
        xmlns="http://wso2.org/carbon/rules"
        targetNamespace="http://com.test/quotation">
    <ruleSet>
        <rule resourceType="regular" sourceType="inline">
            <![CDATA[
                package quotation

                import samples.quotation.Customer;
                import samples.quotation.Quotation;

                rule "Gold Customer"
                when
                      Customer( status == "gold" )
                then
                      Quotation q = new Quotation();
                      q.setPrice(3);
                      insertLogical(q);
                end

                rule "Silver Customer"
                when
                      Customer( status == "silver" )
                then
                      Quotation q = new Quotation();
                      q.setPrice(4);
                      insertLogical(q);
                end

                rule "Bronze Customer"
                when
                      Customer( status == "bronze" )
                then
                      Quotation q = new Quotation();
                      q.setPrice(5);
                      insertLogical(q);
                end
            ]]>
        </rule>
    </ruleSet>
    <operation name="getQuote">
        <input wrapperElementName="placeCustomerDetail" namespace="http://com.test/placeCustomerDetail">
            <fact elementName="customerDetail" namespace="http://com.test/placeCustomerDetail" type="samples.quotation.Customer"></fact>
        </input>
        <output wrapperElementName="placeCustomerDetailRespone" namespace="http://com.test/placeCustomerDetail">
            <fact elementName="getQuotation" namespace="http://com.test/placeCustomerDetail" type="samples.quotation.Quotation"></fact>
        </output>
    </operation>
</ruleService>

Deploying and Testing the Service

1. Deploy the rule service through the BRS management console. You can follow either of the two methods:

  • Bundle all artifacts in an .aar file and upload it (Rule Service -> Upload menu).
  • Create using the Rule Service wizard UI (Rule Service -> Create menu).

The above steps are discussed in detail in section Exposing Rules as Services.

2. After deployment, the service will appear in the "Deployed Services" window of the BRS management console. Access the service's dashboard by clicking on it.

3. In the "Client Operations" widget of the dashboard, invoke the Try-it tool to test the service.

4. In the service's TryIt window, issue a request similar to the following.

<status>bronze</status>
5. Alternatively, you can use code generation link in the  "Client Operations" widget of the dashboard to invoke the service. A client using generated stub codes is shown below where the codes were generated with option "Unpacks the databinding classes".
package org.wso2.carbon.samples;

import org.apache.axis2.AxisFault;
import org.wso2.carbon.samples.quoteService.customerDetail.Customer;
import org.wso2.carbon.samples.quoteService.customerDetail.PlaceCustomerDetail;
import org.wso2.carbon.samples.quoteService.customerDetail.Quotation;
import org.wso2.carbon.samples.quoteService.stub.GetQuoteServiceStub;
import java.rmi.RemoteException;

public class GetQuoteServiceTestCase {

    public static void main(String[] args) {

        try {
            GetQuoteServiceStub getQuoteServiceStub = new GetQuoteServiceStub("http://localhost:9763/services/GetQuoteService");

            PlaceCustomerDetail placeCustomerDetail = new PlaceCustomerDetail();
            Customer customer = new Customer();
            customer.setStatus("gold");
            Customer[] customers = new Customer[1];
            customers[0] = customer;
            placeCustomerDetail.setCustomerDetail(customers);

            Quotation[] quotations = getQuoteServiceStub.getQuote(customers);
            int result = quotations[0].getPrice();
            System.out.println(result);
        } catch (AxisFault axisFault) {
            axisFault.printStackTrace();
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}
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