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Instead of letting the TextThread threads write the text to qDebug directly, let the threads operate through a TextDevice object. It s called a text device because it simulates a shared device for printing text. To print text using the device, use the write method, which writes the given text to the debug console. It also enumerates all texts so that you can tell how many times the write method has been called. The TextDevice class declaration can be seen in Listing 12-6. The class contains what you expect from the preceding description of it: a constructor, a write method, a counter for enumerating the calls, and a QMutex for protecting the counter. Listing 12-6. The TextDevice class declaration class TextDevice { public: TextDevice(); void write( const QString& ); private: int count; QMutex mutex; }; The implementation of the TextDevice class demonstrates a new trick. Listing 12-7 shows how the QMutexLocker class is used to lock the mutex. The mutex locker locks the mutex as soon as it is constructed and then unlocks the mutex when it is being destructed. You could have opted for a solution in which you called lock and unlock explicitly, but by using the QMutexLocker you ensure that the mutex is unlocked even if you exit from a return statement in the middle of the method or when reaching the end of the method. The consequence is that the write method cannot be entered twice from different threads the calls will be serialized. Listing 12-7. The TextDevice class implementation TextDevice::TextDevice() { count = 0; }

A good way to deter computer thieves is to put freestanding servers or client computers in a server rack. Fully enclosed server racks have walls and doors on them. The front and back doors are locked to limit access into the racks themselves. We have heard of only one situation where a thief actually stole a computer rack, and that rack was on casters (wheels). Here are some suggestions for purchasing secure racks: The APC NetShelter racks are common and usually come with keyed access to the metal or glass doors. APC also develops NetBotz, a family of network-accessible appliances that detect and produce various types of alarms based on environmental factors that can threaten the availability of network-critical physical infrastructure such as heat, humidity, and other physical threats to your computing assets. One nice feature of the NetBotz is that it can detect movement and record it using a video camera. Belkin also builds and distributes full-sized racks and rack-optimized hardware. The XRackPro2 by GizMac is a rack-mounted enclosure cabinet specifically designed for noise reduction and security. The XrackPro2 is available in a variety of sizes including 4U, 12U, and 25U. Acousti Products builds full-sized and soundproofed cabinets that can be purchased for a variety of purposes.

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descriptors attributes. You ll see them a lot with BizTalk XML files, and so it is essential that you understand their usefulness. In general, an attribute is used to describe an overall fact of the element and its nested elements that are buried within the tag. For instance, let s say you have a car element: <car> <price>14500</price> </car> If you wanted to add manufacturer data, you could easily add a corresponding manufacturer tag: <car> <manufacturer>Buick</manufacturer> <price>14500</price> </car> However, because the manufacturer is really associated with the car as a whole, many prefer to declare it as an attribute by adding it to the opening, parent element: <car manufacturer="Buick" > <price>14500</price> </car> Attributes must also be enclosed within quotes as shown, if you want to maintain a wellformed document structure. As you can see, it s a little more organized. As you progress farther with BizTalk and XML, you ll find yourself using attributes quite liberally.

void TextDevice::write( const QString& text ) { QMutexLocker locker( &mutex ); qDebug() << QString( "Call %1: %2" ).arg( count++ ).arg( text ); } The TextThread class run method has not changed much compared with the original Listing 12-2. Now the write method is called instead of qDebug. The change is highlighted in Listing 12-8. The m_device member variable is a pointer to the TextDevice object to use. It is initialized from a given pointer in the constructor. Listing 12-8. The TextThread::run method now calls write instead of outputting directly to qDebug void TextThread::run() { while( !stopThreads ) { m_device->write( m_text ); sleep( 1 ); } } The main function has also been slightly revised, compared with what you saw in Listing 12-3. The new version creates a TextDevice object that is passed on the TextThread thread objects. The new version can be seen in Listing 12-9, in which the changes have been highlighted. Listing 12-9. A TextDevice object is instantiated and passed to the TextThread thread objects int main( int argc, char **argv ) { QApplication app( argc, argv ); TextDevice device; TextThread foo( "Foo", &device ), bar( "Bar", &device ); foo.start(); bar.start(); QMessageBox::information( 0, "Threading", "Close me to stop!" ); stopThreads = true; foo.wait(); bar.wait(); return 0; }

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