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the exact direction the plane is facing. But to keep this example simple, we ll just track whether planes are approaching or departing.) As the planes come in, the controllers give them permission to take off or land, and instruct them to change their heading, height, or speed. The aim is to avoid them hitting each other at any point. This, apparently, is also quite important. At present they have a system where each controller is responsible for a particular piece of airspace. They have a rack which contains little slips of plastic with the aircraft s ID on it, ordered by the height at which they are flying. If they are coming in to the airport, they use a piece of blue plastic. If they are going away, they use white plastic. To keep track of the heading, distance, and speed, they just write on the slip with a china graph pencil.* If the plane moves out of their airspace, they hand the plane over to another controller, who slips it into his own rack. So that s our specification.

In reality, a safety-critical system such as ATC would have a more robust spec. However, when lives are not at stake, software specifications are often pretty nebulous, so this example is, sadly, a fair representation of what to expect on your average software project.

SectionName is the name of the section you are defining in Xorg, and the SectionEntry items are the attributes you want the current section to use. You can include more than one SectionEntry if required. In a section, some attributes may contain one or more values, and these values are separated with whitespaces. The values can be numeric or strings. Numeric values can be integers or floating point and do not require double-quotes. Strings are text values and must be enclosed in double-quotes. To find out which attributes require double quotes, look in the xorg.conf man pages. You can turn a line into a comment in the configuration file by putting a hash symbol in front of it. Xorg will ignore those lines and you can use them for notes. Listing 6-1 shows an example xorg.conf file: Listing 6-1. A Sample xorg.conf File Section "ServerLayout" Identifier "Default Layout" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection Section "Device" Identifier "Videocard0" Driver "nv" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection As you can see, there are four sections defined in this configuration file. Three of these sections are dedicated to the input and output devices found in the system, including the keyboard as specified in the InputDevice section. The system video card is defined in the Device section. Screen display configurations such as the amount of color and which screen resolution size to use are declared in the Screen section. Let s look at the sections a little more closely.

Armed with this brilliant description we need to come up with a design for a program which can model the system. We re going to do that using object-oriented techniques. When we do an object-oriented analysis we re looking for the different classes of object that we are going to describe. Very often, they will correspond to real things in the system. For a class to represent these real objects properly, we need to work out what information it is going to hold, and what functions it will define to manipulate that information. In general, any one piece of information will belong to exactly one object, of exactly one class.

Not all of your classes will represent real-world objects. Some will relate to more abstract concepts like collections, or commands. However, designs that wander too far into the realms of the wholly abstract are often clever but not necessarily good .

In our ATC example, it s clear that we have a whole lot of different planes buzzing round the airport. It would therefore seem logical that we would model each one as an object, for which we would define a class called Plane. Because C# is a language with object-oriented features, we have a simple and expressive way of doing that.

Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105"

Earlier in this chapter we saw C# 4.0 s support for embedding interop type information, which can remove the need for primary interop assemblies. That feature has no visible impact on syntax it just makes life easier during installation. However, C# 4.0 has added a couple of features that offer better syntax for certain interop tasks.

Suppose you were to write the following C#:

someObject.MyProperty["foo"] = 42;

"XkbLayout" "us"

Figure 4-9. StateInitialization activity Return to the State Composition View and add a StateInitialization activity to the LastState activity. Within this StateInitialization activity, add a Parallel activity. Add a Code activity called ParallelLeft to the left Sequence activity within the Parallel activity. Generate the Handlers for

Before C# 4.0, there was only one way to interpret this: this code gets MyProperty, and then uses the returned object s indexer to set a value of 42 using an indexer argument of "foo". Remember that properties are just method calls in disguise, so the code is equivalent to:

someObject.get_MyProperty().set_Item("foo", 42);