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14.2.1 Presentation
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For the presentation layer we have several options. Some of the top frameworks are Struts, JSF, Spring, and WebWork. All of these frameworks have their evangelists and are known to perform well in their own right. Out of all of these we choose to use Struts. Struts is stable and predictable, continues to be progressive, and is very much alive for both new and existing applications. From this point on we will assume that you have a moderate understanding of the Struts framework. If you don t, then Struts in Action by Ted N. Husted, Cedric Dumoulin, George Franciscus, and David Winterfeldt (Manning, 2002) is an excellent resource.
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14.2.2 Service
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The service layer will be pretty straightforward. Since this is a book about iBATIS, we will utilize the iBATIS DAO within the service classes. The iBATIS DAO will be used to retrieve and store the data access object instances as instance variables on the service classes. This will allow us to hide the DAO implementation from the
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service classes. The iBATIS DAO will also be used for transaction demarcation so that we can aggregate fine-grained calls against the persistence layer.
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14.2.3 Persistence
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We re sure it won t surprise you that we plan to use iBATIS SQLMaps in the persistence layer. iBATIS SQLMaps will fulfill the responsibility of managing SQL, persistence caches and executing calls against the database. We ll avoid going into too much detail about this since this is a book on the very subject.
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14.3 Tweaking Struts: the BeanAction
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Recently, web application frameworks have experienced a bit of a transformation. Features like state management, bean-based presentation classes, enhanced GUI components, and sophisticated event models have been introduced to make development easier. Even in the midst of these next-generation frameworks, Struts continues to enjoy a strong presence. In assessing the best approach for the JGameStore application, we wanted to use Struts while keeping a forward relevance to the new-generation frameworks. With this in mind, we decided to use an approach that we have dubbed the BeanAction. The BeanAction allows developers of standard Struts applications to easily grasp how iBATIS fits into a standard Struts application. At the same time, developers who use next-generation frameworks like JSF, Wicket, and Tapestry will understand the semantics of the BeanAction approach. In the end, we are not trying to make Struts different; we are simply making our application relevant to a wider audience. The BeanAction successfully flattens the responsibilities of the Action and ActionForm into one class. It also abstracts you away from direct access to the web-specific components like BeanAction BaseBean session and request. This type of architecture is reminiscent of WebWork and ActionContext AbstractBean JSF. This flattening is accomplished through a few key components: the AccountBean CatalogBean BeanAction that extends the Struts Action class, the BaseBean, and the ActionContext. These components are CartBean OrderBean important to understanding how the BeanAction works, and are illustrated Figure 14.1 UML diagram of the BeanAction architecture in figure 14.1.
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Tweaking Struts: the BeanAction
14.3.1 BeanBase
It s important to understand the purpose of the BaseBean before we look into the ActionContext and the BeanAction. The BaseBean extends ValidatorActionForm to allow for standard Struts validation to occur. Instead of extending an ActionForm directly, you extend the BaseBean. The BaseBean contains your normal properties, as an ActionForm normally would. Thus, it is populated as Struts would populate the ActionForm because it is an ActionForm. The only difference is that your extended BaseBean would also contain behavior methods that follow the simplified signature of public String methodName().
14.3.2 BeanAction
The next piece of this puzzle that we should introduce is the BeanAction. The BeanAction has a couple of responsibilities. First, the BeanAction populates the ActionContext. Next, it routes behavior calls to your extended BaseBean and translates the returned behavior method s String into an ActionForward for Struts. This is how the BaseBean is able to stay clear of Struts-specific components in the behavior signatures. The BeanAction class looks in two different places to determine which behavior method to call on the extended BaseBean. First, it checks to see if the action mapping has a specified parameter that explicitly states the method to call. If the parameter specifies *, then a method is not called and the success action forward is used. If the action mapping parameter attribute is not specified or is empty, then the ActionBean looks at the path and uses the filename minus the extension for the method call. So, if you used a standard .do mapping and had a path that ended with /myMethod.do, the myMethod behavior method would be called on your extended BaseBean.
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