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5 Programming the User Interface
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We have studied ways to design the UI architecture, settling on the MVP pattern (with a humble View and a controlling Presenter) and we have applied UiBinder to more easily construct the View component We have worked with testing in mind, and the resulting code will be simpler to test Applying the techniques given here, you can design the UI in an easier way (because the XML templates can be used by nonprogrammers) and the View code will be minimized for faster development In future chapters we build on the structure we created in 4 and this one, and code will follow the styles shown here
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Communicating with Your Server
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Remoteare one of GWT s(RPC) potent tools In this chapter we ll code togetherRPC Procedure Calls can bring client- and server-side and therefore more analyze how
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works and show several patterns of its usage, including live suggestions, client-side data prevalidation, and connecting to Enterprise Java Beans (EJB) We shall even be providing a more complicated example of MVP, with an RPC-enabled composite widget
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RPC enables GWT programmers to work almost as if the client- and server-side code resided at the same machine, making the connection practically invisible There are some differences, however For example, server-side code can use any class and package in the Java repertory, but client-side code is still limited Also, some classes might not be transferred back and forth because of serialization problems; we ll touch on that next Finally, of course connecting to a server and processing without waiting for an answer moves us out of the synchronous world ; callbacks will be used everywhere for asynchronous coding1 For implementation, RPC uses Ajax throughout, and GWT also provides the HTTP client classes (which we ll get to use in 7, Communicating with Other Servers ) if you need to connect to non-GWT server-side code On the server side, servlets are used, by means of extending the RemoteServiceServlet You aren t limited, however, to this architecture; you can use, say, Enterprise Java Beans (EJB) or Restful Services if you want, so your GWT application can connect to practically any kind of server side services architecture The most common usage of RPC is, obviously, accessing server-side servlets or EJBs, but it has a less obvious application, code splitting: a way to reduce the load time of your application, which we see in 15, Deploying Your Application
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1 This is the big difference between RMI (well known to Java programmers) and RPC; the former is synchronous (blocking), whereas the latter is always asynchronous (nonblocking)
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Let s just give a once-over to the central concepts regarding RPC and then move to specific use cases and applications Though there have been some changes in how RPC was implemented as GWT evolved, the basic mechanism (involving a couple of client-side interfaces plus a RemoteService extended server-side class) is still the same2 In particular, magic naming is still applied (meaning GWT expects classes and interfaces names to follow certain rules) so for example, for a WorldService remote service you would have3 public interface WorldService extends RemoteService, with the clientside specification of the provided services public interface WorldServiceAsync, which describes a stub that will mediate with the server and pass the results to the caller via an AsyncCallback, which will be used to pass the server-returned value to the caller
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public class WorldServiceImpl extends RemoteServiceServlet implements WorldService, which provides the actual server-side implementa-
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tion code (We shall see more of this WorldService remote servlet soon) Servlet mapping has also changed In the current style, you need to annotate the client-side WorldService with @RemoteServiceRelativePath() providing the relative path for the remote service as a parameter This annotation causes the client-side proxy to use GWTgetModuleBaseURL()+"theAnnotatedValue" as the service entry point for the servlet You also need to provide more data on the remote servlet in the war/WEB-INF/lib/webxml file, using both the <servlet> and <servlet-mapping> elements4
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<servlet> <servlet-name> worldServlet </servlet-name> <servlet-class> comfkerekimvpprojectserverWorldServiceImpl </servlet-class> </servlet>
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2 Check http://codegooglecom/webtoolkit/doc/latest/DevGuideServerCommunicationhtml, and in particular the Plumbing Diagram, if you want to refresh your RPC knowledge 3 A small bother: The GWT Plugin for Eclipse doesn t help create these three files, but the GWT4NB plugin for Netbeans and the IntelliJ GWT plugin do However, if you change one of the three files, the plugin can help you fix the other two 4 In earlier versions of GWT, you would have had to add <servlet path="" class=""/> elements to your gwtxml file Currently, you need to do so only if you run GWTTestCase code
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