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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java new file mode 100644 index 0000000..cbcb73f --- /dev/null +++ b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/PricerBean.java @@ -0,0 +1,138 @@ +package examples.shop.impl.session;
+
+import java.util.Iterator;
+import java.util.List;
+
+import javax.annotation.Resource;
+import javax.ejb.EJB;
+import javax.ejb.Remote;
+import javax.ejb.Stateless;
+import javax.jws.WebService;
+
+import examples.shop.impl.entity.Customer;
+import examples.shop.impl.entity.LineItem;
+import examples.shop.logic.Pricer;
+import examples.shop.logic.UserManager;
+
+/**
+ * Stateless Session Bean which computes prices based
+ * upon a set of pricing rules. The pricing rules are
+ * deployed with the bean as environment properties.
+ */
+@Stateless
+@Remote(Pricer.class)
+@WebService(serviceName="PricerService", portName="PricerPort")
+public class PricerBean implements Pricer {
+
+ @Resource(name="taxRate")
+ public int taxRate = 0;
+
+ @Resource(name="bulkDiscountRate")
+ public int bulkDiscountRate = 0;
+
+ @EJB
+ UserManager userManager;
+
+ public PricerBean() {
+ }
+
+ /**
+ * bulk discounts apply to quantities of BULK or more items
+ */
+ private static final int BULK = 5;
+
+ /**
+ * This method computes the applicable discount in absolute
+ * figure, based on bulk and personal discounts that may apply.
+ *
+ * @param quantity the number of items that a user intends to buy
+ * @param basePrice the overall, non-discounted volume of the
+ * purchase (individual price times quantity)
+ * @param the user name
+ * @return the subTotal for the line item after applying any
+ * applicable discounts, excluding taxes
+ */
+ public double getDiscount(int quantity, double basePrice, String user) {
+ double discountRate = getPersonalDiscountRate(user);
+ if (quantity >= BULK) {
+ discountRate += getBulkDiscountRate();
+ System.out.println("Using getBulkDiscountRate " + getBulkDiscountRate());
+ }
+
+ /*
+ * Calculate the discount in absolute figures
+ */
+ return basePrice * (discountRate / 100);
+ }
+
+ /**
+ * A bulk discount applies to quantities of more than 5 pieces.
+ * @return the bulk discount rate int percent
+ */
+ public double getBulkDiscountRate() {
+ return this.bulkDiscountRate;
+ }
+
+ /**
+ * Customers with certain names get discounts. The discount rules
+ * are stored in the environment properties that the bean is
+ * deployed with.
+ */
+ public double getPersonalDiscountRate(String userName) {
+ /*
+ * Get the name of this customer.
+ */
+ Customer user = userManager.getUser(userName);
+ if( user != null)
+ return user.getDiscount();
+ else
+ return 0;
+ }
+
+ /**
+ * Computes the subtotal price for a set of products the customer
+ * is interested in. The subtotal takes into account the price of
+ * each product the customer wants, the quantity of each product,
+ * and any personal discounts the customer gets. However, the
+ * subtotal ignores taxes.
+ *
+ * @param quote All the data needed to compute the
+ * subtotal is in this parameter.
+ */
+ public double priceSubtotal(String user, List<LineItem> items) {
+ System.out.println("PricerBean.priceSubtotal() called");
+
+ /*
+ * Compute the subtotal
+ */
+ double subTotal = 0;
+
+ for(Iterator<LineItem> iter = items.iterator(); iter.hasNext(); ) {
+ LineItem item = iter.next();
+ item.setDiscount(
+ getDiscount(item.getQuantity(), item.basePrice(),user));
+
+ /*
+ * Add the price to the subtotal.
+ */
+ subTotal += (item.basePrice() - item.getDiscount());
+ }
+
+ return subTotal;
+ }
+
+ /**
+ * Computes the taxes on a quote.
+ */
+ public double priceTaxes(double subtotal) {
+ System.out.println("PricerBean.priceTaxes() called, taxes: " + getTaxRate());
+ return (getTaxRate() / 100) * subtotal;
+ }
+
+ /**
+ * @return the applicable tax rate
+ */
+ public double getTaxRate() {
+ return taxRate;
+ }
+}
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