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In addition to routing variables, you can also specify both environ and start_response as arguments in your actions. The environ argument will get populated with the same WSGI environment dictionary you can access via the Pylons request global as request.environ, and the start_ response() callable is a WSGI callable you ll learn about in 16. Both environ and start_response get added as attributes to the template context global c in the same way as the routing variables do if you use them in an action. To see all these features in action, consider the following example. When the test() action is called, the browser will display True, True, True, True: def __before__(self, id): c.id_set_in_before = id def test(self, environ, start_response, controller, id): w = c.id_set_in_before == id x = c.environ == environ == request.environ y = c.start_response == start_response z = c.controller == controller request.content_type = 'text/plain' return "%s %s, %s, %s"%(w, x, y, z) After an action is called, Pylons looks for an __after__() method attached to the controller, and if it exists, it is called too. You can use __after__() for performing any cleanup of objects you created in the __before__() method. Both the __before__() and __after__() methods can also accept any of the routing variable names as arguments in exactly the same way as the controller action can. Of course, there are occasions where it is useful to be able to access the routing variables outside your controller code. All the routing variables are available in the request.urlvars dictionary and are also available in request.environ["wsgiorg.routing_args"].

Listing 12-1 shows the class declaration for a class implementing a separate thread called TextThread. You can tell that the class implements a separate thread because it inherits the QThread class. When doing this, it is also necessary to implement the run method. The constructor of the thread accepts a string of text and then outputs that text once every second to the debug console when run. Listing 12-1. The TextThread class declaration class TextThread : public QThread { public: TextThread( const QString &text ); void run(); private: QString m_text; }; The TextThread class is implemented in Listing 12-2. First there is a global variable, stopThreads, which is used to stop the execution of all threads. It is possible to stop a thread by using the terminate method, but that can be compared with letting a thread crash. Nothing is cleaned up, and success is not guaranteed. In the constructor, the given text is noticed and stored in a private member of the text thread. Make sure to invoke the QThread constructor so that the thread is properly initialized. In the run method, the execution enters a loop that is left when stopThreads is set to true. In the loop the text is sent to the debug console using qDebug before the thread sleeps for at least one second using the sleep method. Notice that sleep makes the thread wait for at least the specified time. This means that the sleep can last for a longer time than specified and that the time spent sleeping can vary between calls to sleep.

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System.err.println ("Warning: Could not load password file."); } return userMap; } } /** This class supports a password file that stores hashed (but not salted) passwords. */ class HashedPasswordFile { /* the delimiter used to separate fields in the password file */ public static final char DELIMITER = ':'; public static final String DELIMITER_STR = "" + DELIMITER; /* We assume that DELIMITER does not appear in username and other fields. */ public static Hashtable load(String pwdFile) { Hashtable userMap = new Hashtable(); try { FileReader fr = new FileReader(pwdFile); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { int delim = line.indexOf(DELIMITER_STR); String username = line.substring(0,delim); String hpwd = line.substring(delim+1); userMap.put(username, hpwd); } } catch (Exception e) { System.err.println ("Warning: Could not load password file."); } return userMap; } public static void store(String pwdFile, Hashtable userMap) throws Exception { try { FileWriter fw = new FileWriter(pwdFile); Enumeration e = userMap.keys(); while (e.hasMoreElements()) { String uname = (String)e.nextElement(); fw.write(uname + DELIMITER_STR + userMap.get(uname).toString() + ""); } fw.close(); } catch (Exception e) { e.printStackTrace(); } } }

Now that you have seen some examples of routes being matched against URLs and understand how Pylons uses the routing variables to dispatch to your controller actions, it is time to learn the details of how you can construct individual routes.

can specify the sleeping period using milliseconds (thousands of a second); with usleep, you can specify the sleeping period in microseconds (millions of a second). The possible minimum duration of a sleep is determined by the hardware and current software platform. Requesting to sleep for one microsecond will most likely result in a far longer sleeping period because of such limitations.

As you ve already seen, a route is specified by arguments to map.connect() that include a route path and a number of options. The route path itself can consist of a number of different types of parts between / characters:

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