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CHAPTER 2 THE CORE CONTAINER
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Implementing Factory Objects
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We ve already discussed the advantage of factory objects compared to factory methods: they allow for an extra layer of configuration. Bean definitions that call a method on a factory object use two attributes: the factory-bean attribute, which refers to the factory object, and the factory-method, which indicates the method to call on the factory object. Listing 2-42 demonstrates configuring the java.text.SimpleDateFormat class as a factory object. Listing 2-42. Configuring SimpleDateFormat As a Factory Object in the Container < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <!--(1) --> <bean id="socketFactory" class="javax.net.SocketFactory" factory-method="getDefault"> </bean> <bean id="localhost" factory-bean="socketFactory" factory-method="createSocket"> <constructor-arg value="localhost"/> <constructor-arg value="80"/> </bean> <bean id="apress.com" factory-bean="socketFactory" factory-method="createSocket"> <constructor-arg value="www.apress.com"/> <constructor-arg value="80"/> </bean> </beans> In Listing 2-42, we first configure the javax.net.SocketFactory class using the factory-method attribute, which creates beans from a static factory method (in this case, getDefault()). Next, we use the socketFactory bean as a factory object in the two subsequent bean definitions, where we call the createSocket() method and provide it with two arguments. The configuration in Listing 2-42 is typical for factory objects, where one bean definition configures the factory object and one or more other bean definitions call methods on the factory object. In fact, this method of object construction is not just for factories. It provides a generic mechanism for object construction. Listing 2-43 shows the integration test for this factory object configuration. Listing 2-43. Obtaining the Sockets Created Using the Factory Cbject package com.apress.springbook.chapter02; import junit.framework.TestCase; import import import import org.springframework.core.io.ClassPathResource; org.springframework.beans.factory.BeanFactory; org.springframework.beans.factory.config.ConfigurableListableBeanFactory; org.springframework.beans.factory.xml.XmlBeanFactory;
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public class FactoryObjectIntegrationTests extends TestCase { public void testPreInstantiateSingletons() {
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ConfigurableListableBeanFactory beanFactory = new XmlBeanFactory( new ClassPathResource( "com/apress/springbook/chapter02/socket-factory.xml" ) ); java.net.Socket localhost = (java.net.Socket)beanFactory.getBean("localhost"); java.net.Socket apressDotCom = (java.net.Socket)beanFactory.getBean("apress.com"); assertTrue(localhost.isConnected()); assertTrue(apressDotCom.isConnected()); } }
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Implementing Factory Objects with the FactoryBean Interface
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Spring provides the org.springframework.beans.factory.FactoryBean interface, which is a convenient way to implement factory objects. The FactoryBean interface is chiefly implemented by the classes of the Spring Framework. The biggest advantages gained are a consistent factory model and consistent and straightforward configuration. As a Spring Framework user, you should understand how the container deals with the FactoryBean interface, which is shown in Listing 2-44. Listing 2-44. Spring s org.springframework.beans.factory.FactoryBean Interface public interface FactoryBean { Object getObject() throws Exception; Class getObjectType(); boolean isSingleton(); } The FactoryBean interface defines a getObject() method, which returns the product of the factory. The container will create a bean and recognize the FactoryBean interface, after which the getObject() method is called to get the product of the factory, as shown in Listing 2-45. Listing 2-45. Configuring org.springframework.beans.factory.config.PropertiesFactoryBean < 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="myProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean"> <property name="location" value="classpath:com/apress/springbook/chapter02/PropertyFactory Bean-context.xml"/> </bean> </beans> The configuration in Listing 2-45 uses the org.springframework.beans.factory.config. PropertiesFactoryBean class, which loads a properties file and returns a java.util.Properties file.
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PropertiesFactoryBean is configured in this case, via setter injection before the container calls the getObject() method. We ll talk about the classpath: notation in the next section. When a FactoryBean object is created, it goes through the normal bean life cycle. At the end of the life cycle, the container calls the getObject() method and returns the product of the FactoryBean. The getObject() method is also called on each subsequent request, meaning the product of the FactoryBean is not subject to the normal bean life cycle.
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Introducing the ApplicationContext
All of the features we ve discussed in this chapter so far are implemented by the BeanFactory, the basic container of the Spring Framework. However, as a user of the Spring Framework, you will chiefly work with another container type called the ApplicationContext. The ApplicationContext interface inherits all the capabilities of the BeanFactory interface, including dependency lookup, dependency injection, and support for factories and PropertyEditors. The ApplicationContext automates functionalities that are offered by BeanFactory; for example, it automatically preinstantiates singletons and automatically detects beans that implement specific interfaces in the container.
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