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Let s start the refactoring by fixing the class TranslateToGerman The problem is that TranslateToGerman is used directly from the class BasicForm This reference is hard coded and locks the client into translating English to German using the specific class TranslateToGerman The pattern that TranslateToGerman will implement is the Bridge pattern, and therefore TranslateToGerman needs to implement an interface The following source code defines the interface ITranslationServices that has the same method signature as the TranslateToGerman class: public interface ITranslationServices { string Translate( string word ); } The TranslateToGerman class is rewritten to implement the ITranslationServices interface as follows: public class TranslateToGerman : ITranslationServices { public string Translate( string word ) { if( String.

Unlike the sensors in the previous chapters, you need to pay attention to which wire is connected to the black and which to the white. If you look carefully, one of the two 18-gauge (0.8mm2) speaker wires will have some kind of identification. For example, some speaker wire has a stripe painted on one side. Make the identified wire the one you connect to the black cable wire and it will become the terminal of your voltage sensor. Naturally, the other wire will become the + terminal. The best place to put the 10k resistor is at the junction between the NXT cable and the speaker wire. You can attach it using a terminal block, but soldering is more compact and permanent. Cut the speaker wire so that the wire to be connected to the black cable wire is about 1/4 inch (10mm) longer to compensate for the length of the resistor. It makes the assembly look much neater. Figure 7-4 shows all the parts except the heat shrink.

Figure 8-1. Sharing system preferences To disable a service, open Sharing in System Preferences, highlight the service you want to disable on the Sharing pane, and click the Stop button. You can actually watch services appear and disappear in Activity Monitor as you start and stop them and review the resources (in terms of memory and processor utilization) that the services are using. This allows you to learn more about services as you go.

Compare( word, "Good Morning" ) == 0 ) { return "Guten Morgen"; } else { return "Could not translate"; } } } What is particularly effective about this single refactoring is that BasicForm doesn t need to be modified The application does need to be recompiled The semantics of the class have been preserved even if the original semantics aren t correct This isn t always possible, but should be an objective It isn t necessary to change the instantiation code in BasicForm, but it would be a good idea TranslateToGerman uses an interface, and therefore a factory of some sort is called for The quickest solution would be to create a simple factory within the context of the application However, the quickest way isn t always the best The best way is to use the ClientDispatcher-Server pattern from 4 or the plug-in architecture from 3.

Services are accessible from any computer once they are started (we ll discuss fixing them later in this chapter) To simplify controlling services, Apple lists commonly used services by name rather than by port number For example, you will see File Sharing on the Services pane versus port 548 By adding File Sharing and some of the other more common Apple-centric ports by default, Apple has made basic service management tasks simple to perform This allows you to quickly enable or disable outgoing and incoming traffic for the ports you will most commonly need to access For another computer to connect to yours, you need to know your IP address or the computer name that corresponds to your IP address To find the IP address of your machine, look at the bottom portion of the Sharing pane (Figure 8-1) where the computer name is also displayed.

Put a short piece of heat shrink tubing on the longer speaker wire and solder it to the black wire in the NXT cable. Slide the heat shrink down to cover the connection and shrink it with a hair dryer. Then solder the 10k resistor (brown-black-orange-gold) to the white wire in the cable. Shrink some tubing over the end of the resistor and the connection. It should now look like Figure 7-5.

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