This guide demonstrates a simple shopping application which uses business rules.
Please follow the User Guide before proceeding with this sample, if you have not already followed the User Guide.
There are two facts - A customer made a purchase and a product is added.
package samples.shopping; /** * Product */ public class Product { private String name; private float price; public String getName() { return name; } public float getPrice() { return price; } public void setName(String name) { this.name = name; } public void setPrice(float price) { this.price = price; } } package samples.shopping; /** * Customer */ public class Customer { private String name; private int discount; public Customer(String name, int discount) { this.name = name; this.discount = discount; } public String getName() { return name; } public int getDiscount() { return discount; } public void setDiscount(int discount) { this.discount = discount; } public void setName(String name) { this.name = name; } } package samples.shopping; /** * Discount */ public class Discount { private Customer customer; private int amount; public Discount(Customer customer, int amount) { this.customer = customer; this.amount = amount; } public Customer getCustomer() { return customer; } public int getAmount() { return amount; } public void setCustomer(Customer customer) { this.customer = customer; } public void setAmount(int amount) { this.amount = amount; } } package samples.shopping; /** * Purchase */ public class Purchase { private String customer; private String product; public String getCustomer() { return customer; } public void setCustomer(String customer) { this.customer = customer; } public String getProduct() { return product; } public void setProduct(String product) { this.product = product; } } package samples.shopping; /** * Purchase Log */ public class PurchaseLog { private String customer; private Product product; public PurchaseLog(String customer, Product product) { this.customer = customer; this.product = product; } public String getCustomer() { return customer; } public void setCustomer(String customer) { this.customer = customer; } public Product getProduct() { return product; } public void setProduct(Product product) { this.product = product; } }
<ruleService name="ShoppingService" xmlns="http://wso2.org/carbon/rules" targetNamespace="http://com.test/shopping" scope="transportsession"> <ruleSet> <rule resourceType="regular" sourceType="inline"> <![CDATA[ package shopping dialect "mvel" import samples.shopping.Customer; import samples.shopping.Product; import samples.shopping.Purchase; import samples.shopping.Discount; import samples.shopping.PurchaseLog; rule "Purchase notification new customer" salience 11 no-loop true when $p : Purchase() not Customer(name == $p.customer) then System.out.println( "New Customer : " + $p.customer); insert(new Customer($p.customer, 0)); end rule "Purchase notification" salience 10 no-loop true when $c : Customer() $purchase : Purchase( customer == $c.name) $product : Product( name == $purchase.product) then insert(new PurchaseLog($c.name, $product)); modify($c){ setDiscount(0) } System.out.println( "Customer " + $c.name + " just purchased " + $product.name ); end rule "Apply 10% discount if total purchases is over 100" salience 9 no-loop true dialect "java" when $p : Purchase() $c : Customer(name == $p.customer) $i : Double(doubleValue > 100) from accumulate ( PurchaseLog( customer == $c.name, $price : product.price ), sum( $price ) ) then $c.setDiscount( 10 ); insert( new Discount($c, 10) ); System.out.println( "Customer " + $c.getName() + " now has a shopping total of " + $i ); end rule "cleanUp" salience 8 when $p : Purchase() then retract($p); end ]]> </rule> </ruleSet> <operation name="purchase"> <input wrapperElementName="purchaseOrder" namespace="http://com.test/purchaseOrder"> <fact elementName="purchase" namespace="http://com.test/purchaseOrder" type="samples.shopping.Purchase"></fact> </input> <output wrapperElementName="purchaseOrderRespone" namespace="http://com.test/purchaseOrder"> <fact elementName="discount" namespace="http://com.test/purchaseOrder" type="samples.shopping.Discount"></fact> </output> </operation> <operation name="addProduct"> <input wrapperElementName="addProduct" namespace="http://com.test/addProduct"> <fact elementName="addProduct" namespace="http://com.test/addProduct" type="samples.shopping.Product"></fact> </input> </operation> </ruleService>
<service name="ShoppingService" scope="transportsession"> <operation name="purchase"/> <operation name="addProduct" mep="http://www.w3.org/ns/wsdl/in-only"/> </service>
You can either create an .aar file and upload or create a rule service using rule service wizard UI. Please refer the User Guide for more information.
Adding a product
<name>product name</name> <price>12.34</price>
Doing a purchase
<customer>your name </customer> <product>product name</product>
In additions to the responses, please look at the BRS console too.
You can also use the code generation. There is an option for code generation in the services management page. However, in the axis2 stub-based clients, there is a limitation in managing session with in-only operations such as addProduct. Therefore, prior to use the code generation, you have to remove mep=http://www.w3.org/ns/wsdl/in-only from the service xml and redeploys the service. This makes addProduct method returning an empty result. A client using generated stub codes is shown bellow. Codes was generated with option - Unpacks the databinding classes.
package org.wso2.carbon.samples; import org.apache.axis2.AxisFault; import org.wso2.carbon.samples.shoppingService.product.AddProduct; import org.wso2.carbon.samples.shoppingService.product.Product; import org.wso2.carbon.samples.shoppingService.purchaseOrder.Discount; import org.wso2.carbon.samples.shoppingService.purchaseOrder.Purchase; import org.wso2.carbon.samples.shoppingService.purchaseOrder.PurchaseOrder; import org.wso2.carbon.samples.shoppingService.stub.ShoppingServiceStub; import java.rmi.RemoteException; public class ShoppingServiceTestCase { public static void main(String[] args) { ShoppingServiceStub shoppingServiceStub = null; try { shoppingServiceStub = new ShoppingServiceStub("http://localhost:9763/services/ShoppingService"); shoppingServiceStub._getServiceClient().getOptions().setManageSession(true); AddProduct addProduct = new AddProduct(); Product product = new Product(); product.setName("toy"); product.setPrice(200); Product[] products = new Product[1]; products[0] = product; shoppingServiceStub.addProduct(products); PurchaseOrder purchaseOrder = new PurchaseOrder(); Purchase purchase = new Purchase(); purchase.setCustomer("Ishara"); purchase.setProduct("toy"); Purchase[] purchases = new Purchase[1]; purchases[0] = purchase; purchaseOrder.setPurchase(purchases); Discount[] discounts = shoppingServiceStub.purchase(purchases); int result = discounts[0].getAmount(); System.out.println(result); } catch (AxisFault axisFault) { axisFault.printStackTrace(); } catch (RemoteException e) { e.printStackTrace(); } } }