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Spring allows you to implement a bean with one of its supported scripting languages. You can configure a scripted bean in the IoC container just like a normal bean implemented with Java.

Figure 4-3. The REQUIRED transaction propagation behavior However, if the purchase() method is called by a non-transactional method and there s no existing transaction in progress, it will start a new transaction and run within its own transaction. The propagation transaction attribute can be defined in the @Transactional annotation. For example, you can set the REQUIRED behavior for this attribute as follows. In fact, this is unnecessary, because it s the default behavior. package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { ... @Transactional(propagation = Propagation.REQUIRED) public void purchase(String isbn, String username) { ... } } package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; public class BookShopCashier implements Cashier { ... @Transactional(propagation = Propagation.REQUIRED) public void checkout(List<String> isbns, String username) { ... } }

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Suppose you are going to develop an application that requires interest calculation. First of all, you define the following InterestCalculator interface: package com.apress.springrecipes.interest; public interface InterestCalculator { public void setRate(double rate); public double calculate(double amount, double year); } Implementing this interface is not difficult at all. However, as there are many interest calculation strategies, the users may need to change the implementation very frequently and dynamically. You don t want to recompile, repackage, and redeploy your application every time this happens. So, you consider implementing this interface with one of the supported scripting languages in Spring. In Spring s bean configuration file, you have to include the lang schema definition in the <beans> root element to make use of the scripting language support. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.5.xsd"> ... </beans> Spring 2.5 supports three scripting languages: JRuby, Groovy, and BeanShell. Next, you will implement the InterestCalculator interface with these languages one by one. For simplicity s sake, let s consider the following simple interest formula for interest calculation: Interest = Amount x Rate x Year

Scripting Beans with JRuby First, let s implement the InterestCalculator interface with JRuby by creating the JRuby script, SimpleInterestCalculator.rb, in the com.apress.springrecipes.interest package of your classpath.

Another common propagation behavior is REQUIRES_NEW. It indicates that the method must start a new transaction and run within its new transaction. If there s an existing transaction in progress, it should be suspended first (as, for example, with the checkout method on BookShopCashier, with a propagation of REQUIRED). package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { ... @Transactional(propagation = Propagation.REQUIRES_NEW) public void purchase(String isbn, String username) { ... } } In this case, there will be three transactions started in total. The first transaction is started by the checkout() method, but when the first purchase() method is called, the first transaction will be suspended and a new transaction will be started. At the end of the first purchase() method, the new transaction completes and commits. When the second purchase() method is called, another new transaction will be started. However, this transaction will fail and roll back. As a result, the first book will be purchased successfully while the second will not. Figure 4-4 illustrates the REQUIRES_NEW propagation behavior.

and that change is inevitable (characteristic #12). This risk has a 100 percent chance of eventuating. However, how can we predict what the client will learn about their needs during the development process We can only wait for them to tell us. Moreover, any changes to the scope could introduce new risks: how can you plan for these before you know what they are

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