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8.6.6 web.xml
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The final piece is the web.xml. Like with the other Model 2 framework, it defines a Front Controller servlet that handles requests. In addition, Tapestry allows you to define which class acts as the Visit class (listing 8.23). Listing 8.23 web.xml for the Tapestry web application
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<web-app> <servlet> <servlet-name>calendar</servlet-name> <servlet-class> org.apache.tapestry.ApplicationServlet </servlet-class> <init-param> <param-name> org.apache.tapestry.visit-class </param-name> <param-value> com.manning.hq.ch08.tapestry.EventManager </param-value> Defines the Visit class </init-param> <load-on-startup>0</load-on-startup> </servlet> <servlet-mapping> <servlet-name>calendar</servlet-name> <url-pattern>/calendar</url-pattern> </servlet-mapping> <filter> <filter-name>redirect</filter-name> <filter-class> org.apache.tapestry.RedirectFilter </filter-class> </filter> <filter-mapping> <filter-name>redirect</filter-name> <url-pattern>/</url-pattern> </filter-mapping> Specifies the <welcome-file-list> welcome page <welcome-file>Home.html</welcome-file> </welcome-file-list> </web-app>
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Web frameworks: WebWork, Struts, and Tapestry
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Most of what you see in listing 8.23 is a stock web.xml for a Tapestry project. The only variations are noted in the listing. Using a servlet <init-param>, you tell Tapestry what kind of class you want to use as your visit object. A <welcome-file> element defines which template is your welcome file.
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8.7 Hibernate in the view layer
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A frequent topic of debate when building web applications is what mechanism should be used to send data to the view layer. We re not referring to editable data. When editing, you ll typically convert the domain object into some easily rendered representation before presenting the form to the user. For instance, Struts uses an ActionForm class. We re more concerned about displaying read-only data to the user. A common approach to displaying data in the view layer is to create a separate set of objects called data transfer objects (DTOs). DTOs are created by a transfer object assembler and sent to the view layer for display. DTOs are used because the view typically requires values from more than one domain object. A DTO is used to combine a number of requests for a given view. If you take advantage of Hibernate s proxying and lazy collections, you can effectively bypass creating the DTOs and the logic used to create them, and simply use your domain objects in the view. The only requirement is that a Hibernate Session must be available in the view tier, which is possible when you use a servlet filter or Spring to manage your Session instances. Despite the fact that this approach is relatively easy to implement, some developers dislike doing this. The main objection most developers have to displaying domain objects in the view tier is that it violates layer encapsulation. This objection stems from the idea that the various layers should know as little about each other as possible to avoid tightly coupling the various layers, which in turn encourages reuse.
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While we agree in principle, the reality is that you need some mechanism to display object data to the user. You can either create another tree of DTOs and the logic to populate them, or you can use your preexisting domain objects. Either way, the view has to know how to display something. It might seem counterintuitive to claim that using domain objects to display data is preferable to using a lightweight representation of your data, but let s consider an example. Assume you have an Event object, with a Location and a collection of Speakers. In your Hibernate mapping definition, you proxy the Location class and set the collection to be lazy. Since Location is proxied, it isn t retrieved from the database until you access it. You want to display the Event instance to the user, but you only need to display the Event and the collection of Speakers. The JSP snippet used to display the relevant fields is shown here:
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<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> Event Name: <c:out value="${event.name}"/><br/> Event Date: <c:out value="${event.date}"/><br/> Event Speakers: <br/> <c:forEach var="speaker" items="${event.speakers}"> Speaker Name: <c:out value="${speaker.firstName}"/> <c:out value="${speaker.lastName}"/><br/> </c:forEach>
This view is efficient because the collection of speakers is populated only when you start iterating over it. The Location attribute is never retrieved because you don t access it in the view. This method only works if you proxy persistent classes, use lazy collections, and keep the Hibernate Session instance in the view tier. Of course, this approach may not work with your application requirements, but it s important to realize that it s available.
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