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16.1.3 The separation of concerns principle
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For a component architecture to succeed in being both easy to use and flexible to extend, the ideas of interface and implementation need to be considered. The interface is the functional aspect describing what is to be done. The implementation is the specific how and what is to be accomplished. This means that if you write a logging component and you would like to have the flexibility to log to a number of locations (database, file, socket, unknown, etc.) and support various protocols (HTTP, RMI, JINI, unknown, etc.), you have a design decision to make. You can try to guess which locations and protocols are the most popular, or you can write the log functionality in an interface, write a few implementations that use that interface, and encourage others to write any implementations that they may need. The SoC idea is also sometimes referred to as the plug-in principle, which is more often how it is described. Spring allows separation of concerns with its rich support for aspect-oriented programming (AOP). It helps developers to focus on
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Using JPA with Spring
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writing business logic without having to worry about system-level concerns such as performing transactions or logging in their code. After looking more deeply into the principles Spring was built on, and with their new list of priorities for EJB 3 in hand, the EJB 3 Expert Group did several things to bring EJB 3 more in line with the goals being realized by Spring. These goals include POJO programming model, dependency injection, and use of interceptors.
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At the time of this writing, the Spring framework developers released Spring 2.0 with support for the EJB 3 JPA. It shipped TopLink Essentials as the default persistence provider. It is worth mentioning that Spring is adding partial support directly for EJB 3 as a part of Pitchfork project (www.interface21.com/pitchfork). This will enable you to use EJB 3 annotations such as @Stateless, @Interceptors, and @Resource in Spring beans.
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Now that you have an idea what the Spring framework is, let s explore how you can use Spring with JPA.
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16.2 Using JPA with Spring
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Spring has wide support for ORM technologies, including Hibernate, TopLink, and JDO. The approach Spring takes in how you use their framework makes coding to these ORM options and swapping between them very easy. Spring 2.0 extended this rich support for ORM technologies to include JPA. Table 16.1 shows the Java classes that developers are interested in for using EJB 3 JPA in Spring.
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Table 16.1 Spring classes available for using JPA Spring Class JpaTemplate JpaDaoSupport JpaTransactionManager LocalEntityManagerFactoryBean Description Simplifies JPA access code Superclass for Spring DAOs for JPA data access Used for transactional access of JPA Factory that creates local entity manager when JPA is used outside Java EE Intended to use with a persistence provider outside Java EE
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JpaDialect
EJB 3 and Spring
We ll outline the steps for using the EJB 3 JPA from your web applications. We ll assume you have some basic familiarity with Spring and that you are comfortable with entity packaging and EAOs. We ll primarily focus on using JpaDaoSupport and JpaTemplate, because they are intended to simplify the use of the EJB 3 JPA by shielding you from the details of the EntityManager API. We ll assume you have experience with the general usage of the EntityManager API (which means you ll appreciate even more how Spring is trying to simplify the EJB 3 JPA programming model). Suppose that the ActionBazaar developers thought it would be cool to use Spring in their systems. They started creating a prototype to use Spring with JPA, and decided to implement a part of ActionBazaar in Spring as shown in figure 16.1. We ll work with the ActionBazaar bidding module shown in figure 16.1, in which a simple Spring EAO (BidSpringEAO) is used for accessing the ActionBazaar persistence unit using Spring s JpaTemplate. We ll create Figure 16.1 This ActionBazaar bidding a Spring bean (BidService) and configure it to use the module uses Spring with EAO. We ll build an EAO that uses Spring s JpaTemplate JPA. The Spring bean employs an entity to manipulate entities and use the EAO in a Spring seraccess object to access vice bean. Finally, we ll explore the Spring configuration the entities using that magically glues the EntityManager, EAO, and the JpaTemplate. Spring bean together.
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