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Following on, we will implement the main functionality of the application. It is divided into two sections: the service interface and the service provider. In conjunction with the registry mechanism of the service provider and the Lookup, we can implement functionality that s absolutely decoupled and independent of the specific module. For this purpose, we create a new module to bundle service interfaces for a central provision (see Figure 18-1). From this point of view, the module can be seen as a link between different application modules. As usual, we use File New Project to create a new module. For convenience, we name it Services and set the code name base to com.hboeck.mp3manager.services. Even for this module, we have remember to enable public access for the packages to be created (Properties API Versioning), because only then can we define a dependency to the Services module and be able to use its classes.

Figure 3-3. A class diagram of classes in section 3.1 Figure 3-4 offers a close-up photo of the MiniSSC-II. I started working with this SSC a few years ago and I love it. Currently, there are more powerful controllers out there, but this was the original and I own three, one for Feynman5, one for a robot arm, and one for a spare.

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>>> False == 0 True >>> True + False + 42 43 So now, if you see a logical expression returning 1 or 0 (probably in an older version of Python), you will know that what is really meant is True and False. The Boolean values True and False belong to the type bool, which can be used (just like, for example, list, str, and tuple) to convert other values: >>> bool('I think, therefore I am') True >>> bool(42) True >>> bool('') False >>> bool(0) False Because any value can be used as Boolean values, you will most likely rarely (if ever) need such an explicit conversion.

In the previous section, we created the base for our player design by dividing the Services module into two parts: a service interface and a service provider. Now we ll consider the interfaces the player should provide, as well as other components of our application. These interfaces are described in an abstract class not an interface as the player should be seen as a global service, which means that requesting modules are normally interested in a single player instance only. You will notice, in this and the following sections, that this behavior can be ensured much more easily using an abstract class than an interface.

Figure 3-4. The Scott Edwards MiniSSC-II Servo Controller You can connect to it with 2400 or 9600 baud and it has an output for up to 8 servos. For more detailed information please refer to either www.lynxmotion.com or www.seetron.com/ ssc.htm. Make sure you refer to the manual to finalize your connections.

Inside the Services module, we create a new package named player with an abstract class named Mp3Player. Of course, a player must be able to play back, pause, and stop MP3 files. Additionally, a user should be able to mute the playback, control the volume, and see the current playback position and total duration. Beside that, seek functionality would be great. All these desired functionalities of the player are specified in the abstract class in Listing 18-6. Listing 18-6. Defining the player s interfaces and providing an implementation using the getDefault() method package com.hboeck.mp3manager.services.player; import com.hboeck.mp3manager.filetype.Mp3DataObject; import org.openide.util.Lookup; public abstract class Mp3Player { public static Mp3Player getDefault() { Mp3Player p = Lookup.getDefault().lookup(Mp3Player.class); if (p == null) { p = new DefaultMp3Player(); } return p; } public abstract void play(Mp3DataObject mp3); public abstract void play(ListIterator<Mp3DataObject> mp3s); public abstract void pause(); public abstract void stop(); public abstract void previous(); public abstract void next(); public abstract void setMute(boolean mute); public abstract void setVolume(int volume); public abstract int getDuration(); public abstract int getMediaTime(); public abstract void setMediaTime(int seconds); } The most important method for service requesters the modules that want to use the player is getDefault(), which searches for registered Mp3Player implementations using the Lookup. If an implementation is found, the Lookup returns an instance of it. If no implementation is found, we nonetheless ensure that a requester never obtains a null reference, but always an instance of the Mp3Player class. Therefore, we provide a default implementation

Truth values can be combined (which you ll see in a while), but let s first see what you can use them for. Try running the following script: name = raw_input('What is your name ') if name.endswith('Gumby'): print 'Hello, Mr. Gumby' This is the if statement, which lets you do conditional execution. That means that if the condition (the expression after if but before the colon) evaluates to true (as defined previously), the following block (in this case, a single print statement) is executed. If the condition is false, then the block is not executed (but you guessed that, didn t you ).

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