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You saw in the last chapter that Django s built-in generic views provide an easy way to handle common types of views. By passing the right parameters into a generic view, you can often save quite a bit of time and code when all you want is, for example, to display a list of model objects or a detail of a single object. The situation is no different with the Link model. You want to have a detail view of each individual link and a date-based archive for browsing through all of the links in the database. So open up the urls.py file inside the weblog application, and change this line from coltrane.models import Entry to read from coltrane.models import Entry, Link Then, just as with the Entry model, you ll need to define a dictionary with arguments for the generic views: link_info_dict = { 'queryset': Link.objects.all(), 'date_field': 'pub_date', } Next you can add a new set of URL patterns to the existing list: (r'^links/$', 'archive_index', link_info_dict, 'coltrane_link_archive_index'), (r'^links/( P<year>\d{4})/$', 'archive_year', link_info_dict, 'coltrane_link_archive_year'), (r'^links/( P<year>\d{4})/( P<month>\w{3})/$', 'archive_month', link_info_dict, 'coltrane_link_archive_month'), (r'^links/( P<year>\d{4})/( P<month>\w{3})/( P<day>\d{2})/$', 'archive_day', link_info_dict, 'coltrane_link_archive_day'), (r'^links/( P<year>\d{4})/( P<month>\w{3})/( P<day>\d{2})/ ( P<slug>[-\w]+)/$', 'object_detail', link_info_dict, 'coltrane_link_detail'), When you used them for the Entry model, the template names for the views were (in order): coltrane/entry_archive.html coltrane/entry_archive_year.html coltrane/entry_archive_month.html

public static class StrangePanel extends LabelProvider { @Override public Dimension getPreferredSize () { try { Thread.sleep(1000); JLabel sampleLabel = createLabel(); return sampleLabel.getPreferredSize(); } catch (InterruptedException ex) { Logger l = Logger.getLogger( DeadlockTest.class.getName() ); l.log(Level.SEVERE, null, ex); return super.getPreferredSize(); } } }

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Once you start regularly using an oscilloscope or a logic analyzer, it's like your eyes have been opened to a vast amount of information and understanding that was previously locked away out of sight Unfortunately, though, professional-quality oscilloscopes and logic analyzers don't come cheap and are out of the price range of most hobbyists But that doesn't mean you can't make do with a bit of ingenuity, and an Arduino makes a surprisingly good starting point for building your own basic test equipment It has a decent number of digital inputs that can be used to sample the status of digital pins in a circuit under test, and even has analog inputs that can be used to build a crude oscilloscope so you can visualize analog waveforms using your PC monitor as the display.

public void testCreateLabel() throws Exception { final LabelProvider instance = new StrangePanel(); class R implements Runnable { public void run() { JFrame f = new JFrame(); f.add(instance); f.setVisible(true); f.pack(); } } R showFrame = new R(); SwingUtilities.invokeLater(showFrame); Thread.sleep(500); JLabel result = instance.createLabel(); assertNotNull("Creates the result", result); } } The test works with two threads. One creates a component and shows it, which results in a callback to getPreferredSize under the AWT tree lock. At that point, we start another thread and wait a while for it to acquire the createLabel lock. Under the current implementation, this blocks in the JLabel constructor, and as soon as our thread continues (after 1000ms), we create the deadlock. There can be many fixes, but the simplest is probably to synchronize on the same lock as the JLabel constructor: private HashSet<JLabel> allCreated = new HashSet<JLabel>(); public JLabel createLabel () { synchronized (getTreeLock()) { LOG.log(Level.INFO, "Will create JLabel"); JLabel l = new JLabel (); LOG.log(Level.INFO, "Label created {0}", l); allCreated.add (l); return l; } } The fix is simple; much simpler than the test. However, without the test, we wouldn t make the shape of our amoeba more steady. The time spent writing the test is more than likely time well spent. Often you can write the test by using an already existing API, such as in the case of the getPreferredSize method. Only in special situations do you need to introduce a special

In this project, we use an Arduino to capture multiple input values and pass them via the USB connection to a host computer running a program that deciphers the values and displays them onscreen Because the Arduino itself is not providing any particular intelligence and simply passes on any values it reads, this project is very flexible and the behavior of the system can be changed simply by altering the software that runs on your computer This opens up a wide range of possibilities for using the same basic hardware to process and visualize analog data, parallel digital data, and serial digital data The visualization program demonstrated in this project is written in Processing, a sister project to Arduino that is designed to allow rapid development of visual programs in the same way that Arduino allows rapid development of physical programs Processing runs on Windows, Linux, and Mac OS X.

coltrane/entry_archive_day.html coltrane/entry_detail.html Now that you re also using generic views for the Link model, you ll need a slightly different set of templates: coltrane/link_archive.html coltrane/link_archive_year.html coltrane/link_archive_month.html coltrane/link_archive_day.html coltrane/link_detail.html The variable names available in these templates will be the same as before, so it should be easy to work with them. For example, in the detail view, the Link object will be available in a variable named object. If you d like to, go ahead and set up the templates for now, but in the next chapter you ll be taking a more detailed look at Django s template system and how it can greatly reduce the amount of repetitive work involved in writing templates.

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