shoppingcartbean.java

想学习EJB的同学

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package ejb3.day2;

import java.util.LinkedList;
import java.util.List;
import javax.annotation.Resource;
import javax.ejb.Init;
import javax.ejb.Remote;
import javax.ejb.Remove;
import javax.ejb.SessionContext;
import javax.ejb.Stateful;
import javax.interceptor.Interceptors;

/**
 *
 * @author user
 */
@Stateful(mappedName="ejb/cart")
@Remote(ShoppingCart.class)
@Interceptors(ShoppingCartInterceptor.class)
public class ShoppingCartBean  implements ShoppingCart{
    private List<SalesLine> sales = new LinkedList<SalesLine>();
    
    public ShoppingCartBean(){
        System.out.println("Constructor: ShoppingCartBean" );
    }
    
    @Resource
    public void setSessionContext(SessionContext ctx){
        System.out.println("ShoppingCart: Dependency injection");
    }
       
    
    public void add(SalesLine line) {
        for(SalesLine l : sales){
            if(l.getProduct().getId() == line.getProduct().getId()){
                l.setNum(l.getNum() + line.getNum());
                return;
            }
        }
        sales.add(line);
    }

    public void remove(SalesLine line) {
        for(SalesLine l : sales){
            if(l.getProduct().getId() == line.getProduct().getId()){
                if(l.getNum() > line.getNum()){
                    l.setNum(l.getNum() - line.getNum());
                }else{
                    sales.remove(l);
                }
                
                return;
            }
        }
    }

    public List<SalesLine> list() {
        return sales;
    }

    public float cost() {
        float c = 0.0f;
        for(SalesLine l : sales){
            c += l.getNum() * l.getProduct().getPrice();
        }
        
        return c;
    }
    
    @Remove
    public float placeOrder() {
        return cost();
    }

    //@Init
    public void init() {
        System.out.println("init");
        sales = new LinkedList<SalesLine>();
    }

}