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Controllers are declared, configured, and managed by the Spring Framework just like all other beans in the system Therefore, it is common and recommended to use Dependency Injection, and the full feature set of the Spring Framework, when building and configuring Controllers The handleRequestInternal() method is analogous to the service() method of a servlet, in that it accepts a HttpServletRequest and HttpServletResponse in order to perform some work One of the main differences, as you can see here, is that instead of returning void, this method returns an instance of ModelAndView The main implication of this difference is that Controllers are not intended to render the response Instead, this task is delegated to other components of Spring MVC This is a benefit to Controller design, as it can now focus on delegation to the service layer and safely ignore response rendering issues.

auto_handle overloads the assignment operator, which allows you to change the wrapped handle. When the wrapped handle is not nullptr, and a different handle is to be assigned, the assignment operator first deletes the old tracking handle.

public enum Pin { GPIO_NONE = -1, GPIO_Pin0 = 0, GPIO_Pin15 = 15 } } } Listing 5-25 demonstrates how to use the Cpu class. First, the time for the glitch filter is set to 100 milliseconds. Next, the information about processor speed and the glitch filter are printed.

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The special deals are pulled from the FlightService and placed directly into the model with the name specials The view layer will use this name to locate the list of special deals The ModelAndView instance is constructed with the view name home, used to identify which view to render for this Controller These logical view names are used to keep the Controller decoupled from the view technology..

To save the wrapped handle from being deleted by the destructor or the assignment operator, you can call release on the auto_handle It sets the wrapped handle to nullptr and returns the old handle It is the caller s responsibility to care about the cleanup of the returned handle If you want to find out whether an auto_handle refers to an object, you can use the logical-not operator (operator !) It is overloaded so that it returns false if the wrapped tracking handle is nullptr; otherwise, it returns true To avoid double cleanup, the implementation of auto_handle tries to ensure that at most one auto_handle instance refers to a single object When an auto_handle is assigned to another auto_handle, the wrapped tracking handle moves from the right-hand side of the assignment to the left-hand side.

configuration file. You will learn more about configuring an emulator in 13, which covers hardware emulator components.

Just like there is an ApplicationContext for the FlightService, the web components have their own ApplicationContext. The HomeController will be defined and configured in a spring-servlet.xml file, whose name has special meaning as we ll see in a moment. To make things simple, we will map the URI for the Controller at the same time we define the Controller. By default, Spring MVC will search for all beans configured with a name parameter that begins with a / (forward slash) and will use those names as URI mappings. We are mapping the HomeController to the URI /home (as shown in Listing 4-9), which will be prefixed by the WebApplicationContext path and the servlet mapping to form the full path to the Controller. We will cover how a Controller is fully mapped in more detail when we introduce the web.xml configuration (see the section URI Mapping to Controllers later in this chapter).

Listing 5-25. Using the Cpu Class using System; using Microsoft.SPOT; using Microsoft.SPOT.Hardware; namespace CpuSample { public class Program { public static void Main() { Cpu.GlitchFilterTime = new TimeSpan(0, 0, 0, 0, 100); //100 ms float systemClock = Cpu.SystemClock / 1000000.0f; Debug.Print("System Clock: " + systemClock.ToString("F6") + " MHz"); float slowClock = Cpu.SlowClock / 1000000.0f; Debug.Print("Slow Clock: " + slowClock.ToString("F6") + " MHz"); float glitchFilterTimeMs = Cpu.GlitchFilterTime.Ticks / (float)TimeSpan.TicksPerMillisecond; Debug.Print("Glitch Filter Time: " + glitchFilterTimeMs.ToString("F1") + " ms"); } } }

Note The URI-to-Controller mapping strategy is fully pluggable, making it easy to change if the default

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