Java Reference
In-Depth Information
How It Works
Transaction propagation happens when a transactional method is called by another method. For
example, suppose that a customer would like to check out all books to purchase at the book shop
cashier. To support this operation, you define the Cashier interface as follows:
package com.apress.springenterpriserecipes.bookshop.spring;
public interface Cashier {
public void checkout(List<String> isbns, String username);
You can implement this interface by delegating the purchases to a book shop bean by calling its
purchase() method multiple times. Note that the checkout() method is made transactional by applying
the @Transactional annotation.
package com.apress.springenterpriserecipes.bookshop.spring;
import org.springframework.transaction.annotation.Transactional;
public class BookShopCashier implements Cashier {
private BookShop bookShop;
public void setBookShop(BookShop bookShop) {
this.bookShop = bookShop;
public void checkout(List<String> isbns, String username) {
for (String isbn : isbns) {
bookShop.purchase(isbn, username);
Then define a cashier bean in your bean configuration file and refer to the book shop bean for
purchasing books.
<bean id= " cashier "
class= " com.apress.springenterpriserecipes.bookshop.spring.BookShopCashier " >
<property name= " bookShop " ref= " bookShop " />
To illustrate the propagation behavior of a transaction, enter the data shown in Tables 4-7, 4-8, and
4-9 in your bookshop database.
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