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This guide demonstrates a service for getting quotations, which uses business rules for creating quotations.
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Prerequisites
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Before executing this sample, it is recommended that you refer Exposing Rules as ServicesExposing Rules as Services which explains in detail the process of writing and deploying a business rule.
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To run this sample:
- Windows, Linux or Solaris operating system should exist.
- WSO2 BRS should be installed. To install the BRS, refer Installing the Product. This also includes installing Apache Ant as one of the Installation Prerequisites.
- WSO2 BRS should be started as described in Running the Product.
Sample configuration
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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 a fact named A customer made a get quote request
. Quotation
is used to capture the result of the rules execution.
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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 Configurationservice configuration (service.rsl)
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<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> |
Executing the
sampleservice
To execute the sampleservice, run the ant
command from the <BRS<PRODUCT_Home>HOME>/samples/quotation.service
directory to run the GetQuote Service.
Info |
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Before executing this service, it is recommended that you refer Exposing Rules as Services which explains in detail the process of writing and deploying a business rule. |
Deploying and testing the service
- 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.
- After deployment, click on List under Services in the main tab of the management console. The service will appear in the Deployed Services page.
- Click GetQuote Service to access the dashboard of the service.
- Click Try this service in the Client Operations widget of the dashboard to invoke the Try-it tool.
Issue a request similar to the following in the Try the GetQuote service window.-it tool:
Code Block language html/xml <status>bronze<<status>gold</status>
You would get the following response:Code Block language html/xml <price>3</price>
Alternatively, you can use Generate Axis2 Client 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 the Unpacks the data binding classes check box checked.Code Block language java 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(); } } }
Excerpt hidden true GetQuote service sample of the WSO2 Business Rules Server samples guide.
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