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In some cases, a factory object is required to encapsulate internal state that is related to its configuration (for example, a list of configuration files to load) or that is created to support its operations. This is often seen as an advantage, and it certainly is in the Spring Framework.
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CHAPTER 2 THE CORE CONTAINER
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An example of a factory object in the Java SDK is the javax.net.SocketFactory class, which provides java.net.Socket objects. To use this class, you first need to create and configure it with a String hostname and a port number: javax.net.SocketFactory factory = javax.net.SocketFactory.getDefault(); This code creates a factory object configured to provide sockets. The factory object can now be used to do the actual factory operations in this case, providing a socket connected to a host on port 80: java.net.Socket socket = factory.createSocket("localhost", 80); This factory operation that is, the createSocket() method requires a configured javax.net. SocketFactory factory object. Take a look at the Javadoc for the javax.net.SocketFactory if you want to learn more about the workings of this class. The Spring Framework Core Container supports both factory methods and factory objects as an alternative to creating new beans. We ll discuss this in more detail in the Using Factory Methods and Factory Objects section later in this chapter.
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Introducing the BeanFactory
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The Spring Framework Core Container is also a factory object with configuration parameters and factory operations to support IoC. The operations of the Core Container are defined in the org.springframework.beans.factory.BeanFactory interface, as shown in Listing 2-1. Listing 2-1. The Factory Operations of the org.springframework.beans.factory.BeanFactory Interface package org.springframework.beans.factory; import org.springframework.beans.BeansException; public interface BeanFactory { String FACTORY_BEAN_PREFIX = "&"; Object getBean(String name) throws BeansException; Object getBean(String name, Class requiredType) throws BeansException; boolean containsBean(String name); boolean isSingleton(String name) throws NoSuchBeanDefinitionException; Class getType(String name) throws NoSuchBeanDefinitionException; String[] getAliases(String name) throws NoSuchBeanDefinitionException; } The factory operations on the BeanFactory interface use the internal state of the factory object that s created based on the specific configuration files that have been loaded.
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CHAPTER 2 THE CORE CONTAINER
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WHAT IS A BEAN
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The Spring Framework has its own terminology, which includes terms that are borrowed from different areas in software engineering. One term that is a bit challenging is bean. This term is used very often in the Spring community, but may leave newcomers confused because they have come across the term when using JavaBeans. In Spring, a bean is an object or class instance that s created and managed by the container. The Spring Framework s beans extend the notion of JavaBeans slightly (hence the confusion).
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The Core Container reads its configuration from one or more XML files. Listing 2-2 shows an empty Spring XML configuration file that can be easily edited in your favorite Java IDE. Listing 2-2. An Empty Spring XML Configuration File with a DOCTYPE Element < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> </beans> The built-in XML editor takes advantage of the Spring Document Type Definition (DTD) file, which makes adding a bean to the configuration very straightforward, as shown in Listing 2-3. Listing 2-3. The <beans> Element with a Single <bean> Element < 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="Kim" class="com.apress.springbook.chapter02.Player"> <property name="fullName" value="Kim Clijsters"/> <property name="ranking" value="1"/> </bean> </beans>
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Creating a BeanFactory Object
It s equally straightforward to create a Spring Core Container or an org.springframework.beans. factory.BeanFactory object. Creating a BeanFactory requires only one line of code once the configuration file is in the classpath, as shown in Listing 2-4. Listing 2-4. Creating an XmlBeanFactory Instance That Loads an XML Configuration File BeanFactory beanFactory = new XmlBeanFactory( new ClassPathResource( "com/apress/springbook/chapter02/application-context.xml" ) );
CHAPTER 2 THE CORE CONTAINER
Using Dependency Lookup
Once the container has been created successfully, you can ask for any bean by name, which is actually an example of dependency lookup. For example, getting the Kim instance is very easy: Player player = (Player)beanFactory.getBean("Kim"); The getBean(String) method returns the object registered with the given name in the BeanFactory. If the name cannot be found by the Core Container, an exception will be thrown. The preceding example can cause a ClassCastException, which is one of the most important disadvantages of dependency lookup. You can avoid a ClassCastException by using the overloaded getBean(String, Class) method on BeanFactory: Player player = (Player)beanFactory.getBean("Kim", Player.class); When you provide the expected type, BeanFactory will throw BeanNotOfRequiredTypeException if the object doesn t match the expected type. Another disadvantage of using dependency lookup is that you bind your code to the Spring Framework API.
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