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public: TextDevice(); void run(); void stop(); public slots: void write( const QString& text ); private: int m_count; QMutex m_mutex; }; Listing 12-28 shows the entire implementation of the TextThread class. All three method bodies look simple and they are. The constructor initializes the private members and passes the call onto the QThread constructor. The stop method simply sets m_stop to true. The run method consists of a while loop monitoring the said m_stop flag. As long as it runs, it emits a writeText signal carrying m_text as the argument once per second. Listing 12-28. The implementation of the TextThread class TextThread::TextThread( const QString& text ) : QThread() { m_text = text; m_stop = false; } void TextThread::stop() { m_stop = true; } void TextThread::run() { while( !m_stop ) { emit writeText( m_text ); sleep( 1 ); } } The TextDevice run method is very simple because the class does not perform any work without receiving a call from a signal. Looking at Listing 12-29 you can see that the method simply calls exec to enter the thread s event loop, which waits for signals to arrive. The event loop keeps running until quit is being called (this is the only thing that happens in the stop method).

Click the Schemas cell to show the ellipsis button to the right of the cell. Click that button to show the XSD Schemas dialog box (see Figure 9-24), which lists schemas registered with VWD. The BlockSchema.xsd file is not located in the list, so we have to add it. Click the Add button to open a file dialog box. Locate the directory with the schema file (it should be in the root directory of the SDK you installed). After you select it, you should see it in the list. Make sure to put a check mark in the box next to it when it appears (see Figure 9-25). Close all the dialog boxes, and return to the editor. Type < in the editor to see the block element appear in the drop-down list (see Figure 9-26). This drop-down is a feature of VWD called Intellisense. It takes your input and gives you valid selections based on the schema attached to the XML file.

This mechanism also helps support mailing lists, so that an e-mail whose To says advocacy@python.org can actually be delivered, without rewritten headers, to the dozens or hundreds of people who subscribe to that list. So, as you read the following descriptions of SMTP, keep reminding yourself that the headers-plusbody that make up the e-mail message itself are separate from the envelope sender and envelope recipient that will be mentioned in the protocol descriptions. Yes, it is true that your e-mail client, whether you are using /usr/sbin/sendmail or Thunderbird or Google Mail, probably asked you for the recipient s e-mail address only once; but it then proceeded to use it in two different places, once in the To header at the top of the message, and then again outside of the message when it spoke SMTP in order to send the e-mail on its way.

In the same listing you can also see the write slot implementation. Because the slot can be invoked from several threads at once, it protects the m_count counter using a mutex. The slot can be called directly as a function just as well as being invoked by an emitted signal, so you can t forget this just because the signals are being queued and served one by one. Listing 12-29. The write slot and the run method of the TextDevice class void TextDevice::run() { exec(); } void TextDevice::stop() { quit(); } void TextDevice::write( QString text ) { QMutexLocker locker( &m_mutex ); qDebug() << QString( "Call %1: %2" ).arg( m_count++ ).arg( text ); } Putting the TextThread and TextDevice classes to use is simple. Look at Listing 12-30 for an example of a main function setting up two text threads and one device. Because the data is exchanged via signals and slots, the different thread objects don t need to know about each other; they are simply interconnected using two calls to connect. When the connections have been set up, they are started, and a dialog is shown. As soon as the dialog is closed, all three threads are stopped. The function then waits for them to actually halt before the application ends. Listing 12-30. A main function using the TextThread and TextDevice classes int main( int argc, char **argv ) { QApplication app( argc, argv ); TextDevice device; TextThread foo( "Foo" ), bar( "Bar" ); QObject::connect( &foo, SIGNAL(writeText(const QString&)), &device, SLOT(write(const QString&)) ); QObject::connect( &bar, SIGNAL(writeText(const QString&)), &device, SLOT(write(const QString&)) );

Enough explanation! It is time to show you source code Rather than trying to invent its own API for doing networking, Python made an interesting decision: it simply provides a slightly object-based interface to all of the normal, gritty, low-level operating system calls that are normally used to accomplish networking tasks on POSIX-compliant operating systems This might look like laziness, but it was actually brilliance, and for two different reasons! First, it is very rare for programming language designers, whose expertise lies in a different area, to create a true improvement over an existing networking API that whatever its faults was created by actual network programmers Second, an attractive object-oriented interface works well until you need some odd combination of actions or options that was perfectly well-supported by grungy low-level operating system calls, but that seems frustratingly impossible through a prettier interface.

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