Exposing Rules as Services

package samples.userguide;
/**
* Represents the fact of a customer places an order 
*/
public class PlaceOrder {

       String symbol;
       int quantity;
       double price;

       public String getSymbol() {
           return symbol;
       }

       public void setSymbol(String symbol) {
           this.symbol = symbol;
       }

       public int getQuantity() {
           return quantity;
       }

       public void setQuantity(int quantity) {
           this.quantity = quantity;
       }

       public double getPrice() {
           return price;
       }

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

package samples.userguide;
/**
* Order accept notification
*/
public class OrderAccept {

       private String message;

       public String getMessage() {
           return message;
       }

       public void setMessage(String message) {
           this.message = message;
       }
}            

package samples.userguide;
/**
* Order Reject Notification
*/
       public class OrderReject {

       private String reason;

       public String getReason() {
            return reason;
       }

       public void setReason(String reason) {
            this.reason = reason;
       }
}

package OrderApproval;

import samples.userguide.OrderAccept;
import samples.userguide.OrderReject;
import samples.userguide.PlaceOrder;

rule "Order Approval Rule" dialect "mvel" no-loop true salience 4

when
$placeOrder : PlaceOrder( ( symbol == "IBM" && quantity > 10 ) || ( symbol == "SUN" && price > 100 ) || ( symbol == "MSFT" && price > 50 && quantity < 200 ) )
then

OrderAccept orderAccept = new OrderAccept();
orderAccept.setMessage("Accepted order for: "+ $placeOrder.quantity + " stocks of "+
$placeOrder.symbol +" at$ " + $placeOrder.price);
insertLogical(orderAccept);

end

rule "IBM Order Deny Rule" dialect "mvel" no-loop true salience 3

when
not ( OrderAccept())
$placeOrder : PlaceOrder( symbol == "IBM" )
then
retract($placeOrder);
OrderReject orderReject = new OrderReject();
orderReject.setReason("An Order for stocks of IBM is accepted only if the number of stocks is higher than 10.");
insertLogical(orderReject);
end

rule "SUN Order Deny Rule" dialect "mvel" no-loop true salience 2
when
not ( OrderAccept())
$placeOrder : PlaceOrder( symbol == "SUN" )
then
retract($placeOrder);
OrderReject orderReject = new OrderReject();
orderReject.setReason("An Order for stocks of SUN is accepted only if the stock price is higher than 100 $.");
insertLogical(orderReject);
end

rule "MSFT Order Deny Rule" dialect "mvel" no-loop true salience 1
when
not ( OrderAccept())
$placeOrder : PlaceOrder( symbol == "MSFT" )
then
retract($placeOrder);
OrderReject orderReject = new OrderReject();
orderReject.setReason("An Order for stocks of MSFT is accepted only if the stock price is higher than 50 $ and the number of stocks is lower than 200.");
insertLogical(orderReject);
end