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public ref class FileDumper { FileStream fs; StreamReader sr; DisposedFlag disposedFlag; public: FileDumper(String^ name) : fs(name, FileMode::Open), sr(%fs), disposedFlag("FileDumper") {} void Dump() { disposedFlag.EnsureObjectIsNotDisposed(); Console::WriteLine(sr.ReadToEnd()); } void CheckDisposed() { if (disposedFlag) Console::WriteLine("FileDumper is disposed"); else Console::WriteLine("FileDumper is not disposed"); } }; In this code, the managed class DisposedFlag wraps a simple Boolean variable. In its constructor, this variable is set to false, and the DisposedFlag destructor sets it to true. Since DisposedFlag is used to define an implicitly dereferenced variable in FileDumper, the DisposedFlag constructor is implicitly called by the FileDumper constructor, and the DisposedFlag destructor is implicitly called by the FileDumper destructor. To throw an ObjectDisposedException if a call is made after the FileDumper is disposed, Dump simply calls EnsureObjectIsNotDisposed on the implicitly dereferenced DisposedFlag field. EnsureObjectIsNotDisposed simply throws an exception if the wrapped Boolean variable is set to true in the DisposedFlag destructor.

With the very basics of Spring MVC components introduced, we will now implement the first use case. Because this is the first use case we are building, we will also set up and configure the web application.

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// Allocate button pads and assign the (emulated) hardware pins as input // from specific buttons. ButtonPad[] buttons = new ButtonPad[] { // Associate the buttons to the pins as setup // in the emulator/hardware new ButtonPad(this, Button.Left , Cpu.Pin.GPIO_Pin0), new ButtonPad(this, Button.Right , Cpu.Pin.GPIO_Pin1), new ButtonPad(this, Button.Up , Cpu.Pin.GPIO_Pin2), new ButtonPad(this, Button.Select, Cpu.Pin.GPIO_Pin3), new ButtonPad(this, Button.Down , Cpu.Pin.GPIO_Pin4), }; this.buttons = buttons; } // The emulated device provides a button pad containing five buttons // for user input. This class represents the button pad. internal class ButtonPad { private Button button; private InterruptPort port; private GPIOButtonInputProvider sink; // Construct the object. Set this class to handle the emulated // hardware's button interrupts. public ButtonPad(GPIOButtonInputProvider sink, Button button, Cpu.Pin pin) { this.sink = sink; this.button = button; // When this GPIO pin is true, call the Interrupt method. port = new InterruptPort(pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth); port.OnInterrupt += new GPIOInterruptEventHandler(this.Interrupt); } void Interrupt(Cpu.Pin port, bool state, TimeSpan time) { RawButtonActions action = state RawButtonActions.ButtonUp : RawButtonActions.ButtonDown; RawButtonInputReport report = new RawButtonInputReport(sink.source, time, button, action);

In the MSDN documentation for IDisposable, you can read the following: If an object s Dispose method is called more than once, the object must ignore all calls after the first one. The object must not throw an exception if its Dispose method is called multiple times. Instance methods other than Dispose can throw an ObjectDisposedException when resources are already disposed.

For Use case #1, we need to build a home page that displays special deals for the user. These special deals aren t static presumably they originate from a database so a regular XHTML page isn t enough. Therefore, we will create a Controller that delegates to the service layer to load up the special deals so that the View can render them into XHTML. The most basic Controller implementation is an org.springframework.web.servlet.mvc. AbstractController, perfect for read-only pages and simple requests. It provides a simple callback for handling a request, along with facilities such as controlling caching via HTTP headers and enforcing certain HTTP methods. For extremely simple Controllers, you may implement the Controller interface directly, although we don t recommend it because AbstractController provides many useful features applicable to all types of web requests.

// Queue the button press to the input provider site. sink.Dispatcher.BeginInvoke(sink.callback, report); } } } } This GPIOButtonInputProvider class uses a button pad to associate the pins to buttons. By default, this class uses the pin configuration of the emulator. You need to associate the particular pins of your device as described in the device manual to buttons. The button pin associations for the emulator look like this: ButtonPad[] buttons = new ButtonPad[] { // Associate the buttons to the pins as setup // in the emulator/hardware new ButtonPad(this, Button.Left , Cpu.Pin.GPIO_Pin0), new ButtonPad(this, Button.Right , Cpu.Pin.GPIO_Pin1), new ButtonPad(this, Button.Up , Cpu.Pin.GPIO_Pin2), new ButtonPad(this, Button.Select, Cpu.Pin.GPIO_Pin3), new ButtonPad(this, Button.Down , Cpu.Pin.GPIO_Pin4), }; Your device might have more or fewer buttons on its surface than listed here; the buttons represented by the Button enumeration in Listing 11-35 are applicable. Listing 11-35. Possible Buttons namespace Microsoft.SPOT.Input { public enum Button { None = 0, Menu = 1, Select = 2, Up = 3, Down = 4, Left = 5, Right = 6, Play = 7, Pause = 8, FastForward = 9, Rewind = 10, Stop = 11, Back = 12, Last = 13, Home = 13, } }

The AbstractController is well suited for web resources that return dynamic information but don t Tip

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