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To use the contextual session approach, your DAO methods require access to the session factory, which can be injected via a setter method or a constructor argument. Then, in each DAO method, you get the contextual session from the session factory and use it for object persistence. package com.apress.springenterpriserecipes.course.hibernate; ... import org.hibernate.Query; import org.hibernate.SessionFactory; import org.springframework.transaction.annotation.Transactional; public class HibernateCourseDao implements CourseDao { private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } @Transactional public void store(Course course) { sessionFactory.getCurrentSession().saveOrUpdate(course); } @Transactional public void delete(Long courseId) { Course course = (Course) sessionFactory.getCurrentSession().get( Course.class, courseId); sessionFactory.getCurrentSession().delete(course); } @Transactional(readOnly = true) public Course findById(Long courseId) { return (Course) sessionFactory.getCurrentSession().get( Course.class, courseId); } @Transactional(readOnly = true) public List<Course> findAll() { Query query = sessionFactory.getCurrentSession().createQuery( "from Course"); return query.list(); } } Note that all your DAO methods must be made transactional. This is required because Spring wraps the SessionFactory with a proxy that expects that Spring s transaction management is in play when methods on a session are made. It will attempt to find a transaction and then fail, complaining that no Hibernate session s been bound to the thread. You can achieve this by annotating each method or the entire class with @Transactional. This ensures that the persistence operations within a DAO method will be executed in the same transaction and hence by the same session. Moreover, if a service layer component s method calls multiple DAO methods, and it propagates its own transaction to these methods, then all these DAO methods will run within the same session as well.

Figure 1-1 shows the UML class diagram for the current dependencies between ReportService and different ReportGenerator implementations.

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In the bean configuration file for Hibernate (i.e., beans-hibernate.xml), you have to declare a HibernateTransactionManager instance for this application and enable declarative transaction management via <tx:annotation-driven>. <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 /> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <bean name="courseDao" class="com.apress.springenterpriserecipes.course.hibernate. HibernateCourseDao"> <property name="sessionFactory" ref="sessionFactory" /> </bean> </beans> Remember that HibernateTemplate will translate the native Hibernate exceptions into exceptions in Spring s DataAccessException hierarchy. This allows consistent exception handling for different data access strategies in Spring. However, when calling the native methods on a Hibernate session, the exceptions thrown will be of native type HibernateException. If you want the Hibernate exceptions to be translated into Spring s DataAccessException for consistent exception handling, you have to apply the @Repository annotation to your DAO class that requires exception translation. package com.apress.springenterpriserecipes.course.hibernate; ... import org.springframework.stereotype.Repository; @Repository public class HibernateCourseDao implements CourseDao { ... } Then register a PersistenceExceptionTranslationPostProcessor instance to translate the native Hibernate exceptions into data access exceptions in Spring s DataAccessException hierarchy. This bean post processor will only translate exceptions for beans annotated with @Repository. <beans ...> ... <bean class="org.springframework.dao.annotation. PersistenceExceptionTranslationPostProcessor" /> </beans>

Figure 1-1. Dependencies between ReportService and different ReportGenerator implementations For now, ReportService is creating the instance of ReportGenerator internally, so it has to be aware of which concrete class of ReportGenerator to use. This will cause a direct dependency from ReportService to either of the ReportGenerator implementations. Later you will be able to eliminate the dependency lines to the ReportGenerator implementations completely. Employing a Container Suppose that your report-generating system is designed for more than one organization to use. Some of the organizations may prefer HTML reports while the others may prefer PDF. You have to maintain two different versions of ReportService for different report formats. One creates an instance of HtmlReportGenerator while another creates an instance of PdfReportGenerator. The cause of this inflexible design is that you have created the instance of ReportGenerator inside ReportService directly, so that it needs to know which ReportGenerator implementation to use. Do you remember the dependency lines from ReportService to HtmlReportGenerator and PdfReportGenerator in the class diagram (see Figure 1-1) As a result, any switch of report generator implementation involves modification of ReportService. To solve this problem, you need a container to manage the components that make up your system. A full-featured container would be extremely complex, but let s begin by having you create a very simple one: package com.apress.springrecipes.report; ... public class Container { // The global instance of this Container class for the components to locate. public static Container instance; // A map for storing the components with their IDs as the keys. private Map<String, Object> components; public Container() { components = new HashMap<String, Object>(); instance = this;

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