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Using Dependency Injection
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In 1, we mentioned that dependency injection is preferred over dependency lookup. Here, we ll examine the XML configuration file from 1 in detail. Here s a review: The SwingApplication class has a dependency on the TournamentMatchManager interface, which is injected via the constructor. The DefaultTournamentMatchManager class implements the TournamentMatchManager interface and has a dependency on the MatchDao interface for data-access operations, which is injected via a setter method. The JdbcMatchDao class implements the MatchDao interface and has a dependency on the javax.sql.DataSource interface for connecting to the database, which is injected via a setter method. Listing 2-5 shows how we ve configured these classes and dependencies in an XML configuration file. Listing 2-5. Configuring Dependency Injection in the Spring XML Configuration File < 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="swingApplication" class="org.apress.springbook.chapter02.SwingApplication"> <constructor-arg ref="tournamentMatchManager"/> </bean> <bean id="tournamentMatchManager" class="org.apress.springbook.chapter02.DefaultTournamentMatchManager"> <property name="matchDao" value="matchDao"/> </bean>
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CHAPTER 2 THE CORE CONTAINER
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<bean id="matchDao" class="org.apress.springbook.chapter02.JdbcMatchDao"> <property name="dataSource" ref="dataSource"/> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="org.hsqldb.jdbcDriver"/> <property name="url" value="jdbc:hsqldb:hsql:/localhost/test"/> <property name="username" value="sa"/> <property name="password" value=""/> <property name="initialSize" value="10"/> <property name="testOnBorrow" value="true"/> </bean> </beans> The configuration in Listing 2-5 shows four beans: swingApplication, tournamentMatchManager, matchDao, and dataSource. These beans are created in a specific order: When the container creates the swingApplication bean, it will detect that in order to call its constructor, the tournamentMatchManager bean is needed (because it is set as a constructor argument in the <constructor-arg> element) and will attempt to create it. After the container creates the tournamentMatchManager bean, it will detect that the matchDao bean is needed to inject in the matchDao property and will attempt to create it. After the container creates the matchDao bean, it will detect that the dataSource bean is needed to inject in the dataSource property and will attempt to create it. After the container creates the dataSource bean, it will find no references to other beans and will set the values to the properties of the bean. Next, the container will inject the dataSource bean in the dataSource property of the matchDao bean. The container will then inject the matchDao bean in the matchDao property of the tournamentMatchManager bean. Finally, the container will create the swingApplication bean and inject the tournamentMatchManager bean via the constructor. The order in which the bean definitions are defined in the XML configuration file is not relevant, as the container will make sure that beans are created in the correct order. Now let s take a closer look at how the configuration file in Listing 2-5 works.
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Bean Definitions
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The <bean> elements in the XML file in Listing 2-5 are called bean definitions. The container will convert each <bean> element, its attributes, and child elements to a BeanDefinition object and use this configuration to influence the life cycle of the beans that are created by the container, based on the following information: How to create the bean: Usually, this is a fully qualified class name. The container will create an object by calling the designated constructor on the class, which is the no-argument constructor if no additional <constructor-arg> elements are provided. Alternatively, the container may also call a factory method or method on a factory object. How to configure the bean: An optional list of <property> elements tells the container which setter injections to perform. The container can inject values, lists, maps, properties, and references to other beans.
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CHAPTER 2 THE CORE CONTAINER
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How to initialize the bean: The container can optionally initialize a bean by calling an initialization method. This allows the bean to initialize itself and check if all required dependencies are available. How to manage the bean life cycle: The container can manage a bean in two ways: as a singleton always returning the same instance or as a prototype creating and returning a new instance on every request. How to destroy the bean: Singleton beans can optionally be destroyed when the container is closed by calling a destroy method. This step in the bean life cycle is useful to clean up internal resources. A bean definition instructs the container how to create beans and when. We ll discuss the details of both in the remainder of this chapter.
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