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public void checkout(ShoppingCart cart) throws IOException { double total = 0; for (Product product : cart.getItems()) { total += product.getPrice(); } writer.write(new Date() + "\t" + total + "\r\n"); writer.flush(); } public void closeFile() throws IOException { writer.close(); } } In the Cashier class, the openFile() method opens the text file with the cashier name as the file name in the specified system path. Each time you call the checkout() method, a checkout record will be appended to the text file. Finally, the closeFile() method closes the file to release its system resources. Then you declare a cashier bean with the name cashier1 in the IoC container. This cashier s checkout records will be recorded in the file c:/cashier/cashier1.txt. You should create this directory in advance or specify another existing directory. (On a Unix derivative, you might put it in your home directory: ~/cashier.) <beans ...> ... <bean id="cashier1" class="com.apress.springenterpriserecipes.shop.Cashier"> <property name="name" value="cashier1" /> <property name="path" value="c:/cashier" /> </bean> </beans> However, in the Main class, if you try to check out a shopping cart with this cashier, it will result in a NullPointerException. The reason for this exception is that no one has called the openFile() method for initialization beforehand. package com.apress.springenterpriserecipes.shop; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; public class Main { public static void main(String[] args) throws Exception { // checkout() throws an Exception ApplicationContext context = new FileSystemXmlApplicationContext("beans.xml"); ... Cashier cashier1 = (Cashier) context.getBean("cashier1"); cashier1.checkout(cart1); } }

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Your application has an advanced scheduling requirement that you would like to fulfill using Quartz Scheduler. Moreover, you want to configure your scheduling jobs in a declarative way.

Spring provides utility classes for Quartz to enable you to configure scheduling jobs in the bean configuration file, without programming against the Quartz API.

In addition to declaring transactions in the bean configuration file with pointcuts, advices, and advisors, Spring allows you to declare transactions simply by annotating your transactional methods with @Transactional and enabling the <tx:annotation-driven> element. However, Java 1.5 or higher is required to use this approach. Note that although you could apply the annotation to an interface method, it s not a recommended practice.

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Using Quartz Without Spring s Support To use Quartz for scheduling, first create your job by implementing the Job interface. For example, the following job executes the replicate() method of a file replicator, retrieved from the job data map through the JobExecutionContext object that s passed in.

To define a method as transactional, you can simply annotate it with @Transactional. Note that you should only annotate public methods due to the proxy-based limitations of Spring AOP. package com.apress.springenterpriserecipes.bookshop.spring; ... import org.springframework.transaction.annotation.Transactional; public class JdbcBookShop extends JdbcDaoSupport implements BookShop { @Transactional public void purchase(String isbn, String username) { int price = getJdbcTemplate().queryForInt( "SELECT PRICE FROM BOOK WHERE ISBN = ", new Object[] { isbn }); getJdbcTemplate().update( "UPDATE BOOK_STOCK SET STOCK = STOCK - 1 "+ "WHERE ISBN = ", new Object[] { isbn }); getJdbcTemplate().update( "UPDATE ACCOUNT SET BALANCE = BALANCE - "+ "WHERE USERNAME = ", new Object[] { price, username }); } }

Risk management deals with known risks, that is, risks that can be foreseen. A typical risk register for a software development project would include

lib/quartz directory of the Spring installation), commons-collections.jar (located in lib/ jakarta-commons), and jta.jar (located in lib/j2ee) in your classpath.

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You may apply the @Transactional annotation at the method level or the class level. When applying this annotation to a class, all of the public methods within this class will be defined as transactional. Although you can apply @Transactional to interfaces or method declarations in an interface, it s not recommended because it may not work properly with class-based proxies (i.e., CGLIB proxies). In the bean configuration file, you only have to enable the <tx:annotation-driven> element and specify a transaction manager for it. That s all you need to make it work. Spring will advise methods with @Transactional, or methods in a class with @Transactional, from beans declared in the IoC container. As a result, Spring can manage transactions for these methods. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <tx:annotation-driven transaction-manager="transactionManager"/> ... <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"ref="dataSource"/> </bean> <bean id="bookShop" class="com.apress.springenterpriserecipes.bookshop.spring.JdbcBookShop"> <property name="dataSource"ref="dataSource"/> </bean> </beans> In fact, you can omit the transaction-manager attribute in the <tx:annotation-driven> element if your transaction manager has the name transactionManager. This element will automatically detect a transaction manager with this name. You have to specify a transaction manager only when it has a different name. <beans ...> <tx:annotation-driven /> ... </beans>

package com.apress.springrecipes.replicator; ... import org.quartz.Job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; public class FileReplicationJob implements Job {

public void execute(JobExecutionContext context) throws JobExecutionException { Map dataMap = context.getJobDetail().getJobDataMap(); FileReplicator fileReplicator = (FileReplicator) dataMap.get("fileReplicator"); try { fileReplicator.replicate(); } catch (IOException e) { throw new JobExecutionException(e); } } } After creating the job, you configure and schedule it with the Quartz API. For instance, the following scheduler runs your file replication job every 60 seconds with a 5-second delay for the first time of execution: package com.apress.springrecipes.replicator; ... import org.quartz.JobDetail; import org.quartz.Scheduler; import org.quartz.SimpleTrigger; import org.quartz.impl.StdSchedulerFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) throws Exception { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); FileReplicator documentReplicator = (FileReplicator) context.getBean("documentReplicator"); JobDetail job = new JobDetail(); job.setName("documentReplicationJob"); job.setJobClass(FileReplicationJob.class); Map dataMap = job.getJobDataMap(); dataMap.put("fileReplicator", documentReplicator); SimpleTrigger trigger = new SimpleTrigger(); trigger.setName("documentReplicationJob"); trigger.setStartTime(new Date(System.currentTimeMillis() + 5000)); trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY); trigger.setRepeatInterval(60000);

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