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The Spring Framework
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replacement for direct session calls, without all the hassle of messy resource cleanup code.
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Callbacks
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Complex things should be possible as well. Not all operations can easily be reduced to a single query in a single transaction. For these operations, Spring provides the Callback interface. It allows you to write a callback method that will be executed within the template. For example, you can use it if you want to build a complex query, update some data, and then save the changes, all within a single operation:
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import import import import import import import org.hibernate.HibernateException; org.springframework.orm.hibernate3.HibernateCallback; java.sql.SQLException; org.hibernate.Query; java.util.List; java.util.Iterator; com.manning.hq.ch07.Event;
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template.execute(new HibernateCallback() { public Object doInHibernate(Session session) throws HibernateException, SQLException { Query query = session.createQuery("from Event"); query.setMaxResults(2); List events = query.list(); for (Iterator it = events.iterator(); it.hasNext();) { Event event = (Event) it.next(); event.setDuration(60); } return null; } });
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Here, the Callback interface uses an anonymous inner class, the HibernateCallback, which defines only a single method, doInHibernate(). You will always write the body of the method, and then pass the HibernateCallback object to the template, which then executes it. The template handles the resource-management code, leaving you only the task of writing the query logic.
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Organizing with Spring and data access objects
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7.4.2 Beans and their factories
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You have seen how Spring can be used programmatically to reduce resource cleanup code. In addition, it can be used to better organize the project architecturally. Spring s traditional claim to fame is that it is a lightweight container. It excels at working with and configuring simple JavaBeans. Essentially its role is to act as a factory for building and configuring beans for your application. This means it can be used to configure most existing architectures and libraries, including Hibernate.
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A central configuration file
Up to this point, you have configured Hibernate through the combined use of the hibernate.cfg.xml file (declaratively) and some programmatic activities, such as using the HibernateFactory. Spring can provide an alternative way to configure Hibernate entirely declaratively. The biggest benefit of using Spring is that you can reduce or eliminate the need for programmatic configuration. Spring reads an XML file, written in a generic configuration format. The XML file specifies how to wire together the various objects, including the DataSource, SessionFactory, and all of your DAOs. Once you configure the file, you can use it as the central clearinghouse to look up the DAOs. To illustrate, create at the root of the classpath a file called applicationContext.xml, which should look like the one shown in listing 7.3. Listing 7.3 ApplicationContext.xml, which defines a data source, session factory, and DAO
< xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> B
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<property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> <property name="url"> <value>jdbc:mysql://localhost/events_calendar</value> </property> <property name="username"> <value>root</value> </property> <property name="password"> <value></value> </property> </bean> <bean id="factory" class= C "org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="mappingResources"> <list> <value>com/manning/hq/ch07/Event.hbm.xml</value> <value>com/manning/hq/ch07/Location.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </prop> <prop key="hibernate.show_sql">false</prop> </props> </property> <property name="dataSource"> D <ref bean="dataSource"/> </property> </bean> <bean id="eventDao" E class="com.manning.hq.ch07.EventSpringDao"> <property name="sessionFactory"> F <ref bean="factory" /> </property> </bean> </beans>
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Some of the lines in listing 7.3 require a bit of explanation:
B Configures a basic data source, using the Apache Commons database
connection pool (DBCP), which is distributed with Hibernate.
C Configures a
tory
SessionFactory, using the built-in Spring SessionFacwrapper, LocalSessionFactoryBean. It builds a SessionFactory when Spring reads this file. The SessionFactory is stored under the key factory.
D Links the SessionFactory to the data source. E Configures your EventSpringDao and names it eventDao. F Connects the DAO to the session factory. This allows the DAO to
open sessions and issue queries. The configuration XML file in listing 7.3 holds all the details, things that can and do often change. It accomplishes a lot of the same things the hibernate.cfg.xml file does, but also handles building the SessionFactory for you, as you ll see in the next section.
Building the ApplicationContext
The applicationContext.xml you just created holds the details for how to build the session factory. It essentially takes the place of the hibernate.cfg.xml file that you have seen the HibernateFactory use, serving as a one-for-one replacement. It defines the properties and mapping files that would normally be in the hibernate.cfg.xml. In our previous code examples, you needed to build the SessionFactory, or have your EventDao object locate and connect to the SessionFactory. Spring inverts that concept. Instead, Spring builds the EventDao for you, and you need to ask it for a reference to an EventDao, like so:
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.manning.hq.ch07.Event; ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); EventSpringDao eventDao =
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