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private: int count; QReadWriteLock lock; }; In the implementation shown in Listing 12-12, you can see the changes made to the TextDevice class. The new method increase creates a QWriteLocker referencing the QReadWriteLock before altering the counter. The updated write method creates a QReadLocker in the same manner before using the counter when creating the text that is sent to the debug console. The code is fairly easy to read and understand, even though the newly implemented protection feature is a fairly complex concept. Listing 12-12. The TextDevice class implementation using the QReadLocker and QWriteLocker to protect the count member variable TextDevice::TextDevice() { count = 0; } void TextDevice::increase() { QWriteLocker locker( &lock ); count++; } void TextDevice::write( const QString& text ) { QReadLocker locker( &lock ); qDebug() << QString( "Call %1: %2" ).arg( count ).arg( text ); } The IncreaseThread class bears many similarities to the TextThread class (the class declaration is shown in Listing 12-13). Because it is a thread, it inherits QThread. The constructor accepts a pointer to the TextDevice object to call increase on, and the class contains a private pointer to such a device (named m_device) for keeping that pointer. Listing 12-13. The IncreaseThread class declaration class IncreaseThread : public QThread { public: IncreaseThread( TextDevice *device ); void run(); private: TextDevice *m_device; };

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In the context of a Pylons application, you would usually write unit tests for any helpers or other libraries you have written You might also use a unit test to ensure your model classes and methods work correctly Your Pylons project has a test_modelspy file in the tests directory for precisely this purpose While unit tests are designed to ensure individual units of code work properly, functional tests ensure that the higher-level code you have written functions in the way that users of your Pylons application would expect For example, a functional test might ensure that the correct form was displayed when a user visited a particular URL or that when a user clicked a link, a particular entry was added to the database Functional tests are usually used in the context of a Pylons application to test controller actions.

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Markowitch, Olivier, and Steve Kremer 2001 A multi-party optimistic non-repudiation protocol In Information Security and Cryptology ICISC 2000, Third International Conference, Seoul, Korea, December 8 9, 2000, Proceedings (LNCS 2015), ed Dongho Won, 109 122 Berlin: Springer-Verlag Markowitch, Olivier, and Yves Roggeman 1999 Probabilistic non-repudiation without trusted third party In Second Workshop on Security in Communication Networks Matyas, Stephen M 1979 Digital signatures an overview Computer Networks: The International Journal of Distributed Informatique 3 (2): 87 94 McDaniel, Patrick, and Sugih Jamin 2000 Windowed certificate revocation INFOCOM (3), 1406 1414 McGraw, Gary 2004 So you d like to become a software security expert, wwwamazoncom/exec/obidos/tg/guides/guide-display/-/15Z37MNOO3P3P/ 002-4169922-4092837 McGraw, Gary, and John Viega 2000 Make your software behave: Learning the basics of buffer overflows IBM developerWorks, March 1 Merkle, Ralph C 1990 A certified digital signature.

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The implementation of the IncreaseThread class reflects what you learned from the class declaration (you can see the code in Listing 12-14). The m_device is initialized in the constructor, and the QThread constructor is invoked to initialize the base class. In the run method, the increase method of m_device is called every 1.2 seconds, and the loop is stopped when stopThreads is set to true. Listing 12-14. The IncreaseThread class implementation IncreaseThread::IncreaseThread( TextDevice *device ) : QThread() { m_device = device; } void IncreaseThread::run() { while( !stopThreads ) { msleep( 1200 ); m_device->increase(); } } The TextDevice class is not affected from these changes and is identical to the class shown in Listing 12-8. The main function is also very similar to the previous example. The only change is that an IncreaseThread object has been added. Listing 12-15 shows the main function with the added lines highlighted. Listing 12-15. The main function, setting up a TextDevice, two TextThreads, and an IncreaseThread int main( int argc, char **argv ) { QApplication app( argc, argv ); TextDevice device; IncreaseThread inc( &device ); TextThread foo( "Foo", &device ), bar( "Bar", &device ); foo.start(); bar.start(); inc.start(); QMessageBox::information( 0, "Threading", "Close me to stop!" ); stopThreads = true; foo.wait(); bar.wait();

Some people would argue that the best time to write unit and functional tests is before you have written the code that they would test, and this might be an approach you could take when developing your Pylons application The advantages of this approach are the following: You can be confident the code you have written fulfils your requirements It is likely the code you have written is not overengineered, because you have concentrated on getting the test suite to pass rather than future-proofing your code against possible later changes You know when the code is finished once the test suite passes Another approach that helps you write code that meets your requirements without being overengineered is to write the documentation for your Pylons project first and include code samples.

Python comes with a library called doctest that can analyze the documentation and run the code samples to check that they work in the way you have documented You ll learn more about doctest in 13 The final type of testing you should strongly consider integrating into your development process is user testing User testing doesn t involve writing any automated tests at all but instead typically involves getting together a willing and representative group of the intended users of your product and giving them tasks in order to watch how they interact with the system You then make notes of any tasks they struggle with or any occasions where the software breaks because of their.

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