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The Presentation Tier
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SCA does not offer an alternative presentation-tier technology When it comes to user interfaces, SCA s mantra is integration Service tiers built with SCA can be integrated with a variety of client technologies, including Swing and rich-clients built using Adobe Flex, AJAX, and web frameworks, such as Struts and Java Server Faces (JSFs) Instead of a cursory overview of how SCA integrates with a wide variety of presentation-tier technologies, this chapter focuses on how Java EE web applications are used as front-ends to SCA services Speci cally, we cover how servlets and Java Server Pages (JSPs) access SCA services With this knowledge, it is possible to integrate SCA services with more sophisticated presentation-tier technologies, including the myriad of web frameworks that exist today
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As a component-based technology, it may not be surprising that SCA has the notion of a web component Web components are Java EE web applications con gured as components What does this mean In a nutshell, it is the way servlets and JSPs can be wired to SCA services This brings SCA protocol abstraction bene ts to the
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The Presentation Tier
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presentation tier; similar to Java-based components, servlets and JSPs can invoke services without having to resort to low-level, transport-speci c APIs
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Web components are like any other SCA component in that they may have references wired to remotable services
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Web components are like any other SCA component in that they may have references wired to remotable services Returning to the BigBank loan application from previous chapters, BigBank may decide to offer a consumer-facing web application that offers loans directly to customers In this case, a Java EE web application will provide the user interface and interact with the LoanService for processing Listing 121 illustrates this scenario
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Listing 121
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A Web Component Wired to the LoanService
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<composite > <component name="lending"> <implementationweb/> <reference name="loanService" target="LoanComponent"/> </component> <component name=" LoanComponent "> <implementationjava /> </component> </composite>
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Using a web component, implementing a servlet that collects loan application information and submits a request to the LoanService is fairly straightforward In fact, the servlet resembles a typical Javabased component, as shown in Listing 122
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Listing 122 A Servlet That Accesses the LoanService
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public class BigBankLoanServlet extends HttpServlet{ @Reference protected LoanService loanService; protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // } }
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In Listing 122, take note of the @Reference annotation As with Java-based components, this instructs the SCA runtime to inject a proxy to a service When injected, the servlet can invoke the proxy, which may forward the request to a component hosted on a remote runtime The speci c transport used for example, web services, JMS, or RMI is conveniently abstracted from the servlet code Having seen the essentials of how a web component is implemented, let s now look in more detail at how one is con gured Con guring a Web Component In the preceding example, we implemented a servlet with a single reference to the LoanService This reference is wired by con guring a web component in a composite Web components are designated using the implementationweb element Listing 123 presents the BigBank web component
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Listing 123 De ning a Web Component
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<composite > <component name="BigBank"> <implementationweb/> </component> </composite>
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As with other component types, when the web component is deployed to a domain, the SCA runtime is responsible for injecting reference proxies in this case, on the servlet Often, more than one servlet in a web component may need to access the same service In this case, each servlet de nes a reference (using the @Reference annotation) with the same name In the composite, the reference only needs to be con gured once: The SCA runtime will inject a reference proxy into each servlet with an @Reference declaration For example, if the BigBank web component contained two servlets with references to LoanService, the component de nition would be the same as in Listing 123
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