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provider will register the service object with service locators and then wait for network requests to come in for the service What the service provider will actually export as service object is usually a proxy for the service The proxy is an object that will eventually run in a client, and it will usually make calls back across the network to service back-end objects These back-end objects running within the server actually complete the implementation of the service The proxy and the service back-end objects are tightly integrated; they must communicate using a protocol known to them both, and they must exchange information in an agreed-upon manner However, the relative size of each is up to the designer of a service and its proxy For example, the proxy may be fat (or smart ), which means it does a lot of processing on the client side.

pushes data back to the Model for CRUD (Create, Read, Update, Delete) operations. The Model for this sample application will be created with sample data. The binding syntax in Silverlight allows us to tie the View and ViewModel together so that updates to the View are pushed to the Model without any extra coding we do this using two way bindings.

One of the major new features in Silverlight 4 for MVVM is improved support for Commanding. The interface for Commanding, ICommand, was first presented in Silverlight 3, but lacked any implementation out of the box. ICommand is found in the System.Windows.Input namespace. In Silverlight 4, a command property was added to ButtonBase and Hyperlink to enable you to hook your buttons up to your ViewModel. Here is what ICommand Interfaces look like: Public interface ICommand { event EventHandler CanExecuteChanged; bool CanExecute(object parameter); void Execute(object parameter); }

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Figure A-10. Placement of the component on a PC board To make a solder joint, touch the soldering iron tip to both the PCB copper pad and the component wire at the same time and allow the connection to heat for a second. Figure A-11 shows the proper placement of the soldering iron tip and the lead.

Back-end object(s) within the service provider itself are then typically thin, not doing much at all Alternatively, the proxy may be thin, doing little more (or nothing more) than passing requests between the client and fat back-end objects, and most processing will be done by these back-end objects running in the service provider As well as this choice of size, there is also a choice of communication mechanisms between the client and service provider objects Client/server systems often have the choice of message-based or remote procedure call (RPC) communications These choices are also available between a Jini proxy and its service Since they are both in Java, there is a standard RPClike mechanism called Remote Method Invocation (RMI), and this can be used if wanted There is no need to use RMI, but many implementations of Jini proxies will do so because it is easy.

We are going to apply MVVM and the new template in Blend 4 to create our portion of the MVVM Masters Tracker application. Our project will display a list of users on one side and detailed information about each MVVM master on the other side. I cover the various aspects of the project template and create a working implementation of MVVM. I will point out the various pieces of MVVM as we progress and provide some more detailed explanation as we move forward. First let s go over the project template.

New Project (Figure 15-2).

RMI does force a particular choice of thin proxy to fat service back-end, though, and this may not be ideal for all situations This chapter looks at one possibility only, where the proxy is fat and is the whole of the service implementation (the service back-end is an empty set of objects) 11 covers the other possibilities in more detail..

Figure A-12. Adding solder to the connection Allow enough solder to flow around the connection, as shown in Figure A-13. You might think that the components would be instantly damaged by the high temperature of soldering. However, they re designed to tolerate it for fairly long periods, and you shouldn t be afraid to take the time to make a good joint. Remove the solder and iron and then allow the connection to cool for a few seconds before moving anything. The solder should be shiny and look almost wet when it first cools.

3. Select Silverlight as the Project type (Figure 15-3).

The file classifier service does not rely on any particular properties of its host it is not hardware or operating system dependent, and it does not make use of any files on the host side. In this case, it is possible to upload the entire service to the client and let it run there. The proxy is the service, and no processing elements need to be left on the server.

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