[6572] in SIPB IPv6
Override the done method if the worker object needs to update a GUI component with the results of the thread or to clean up.
daemon@ATHENA.MIT.EDU (assemblywoman)
Sat Jun 16 07:17:20 2007
Date: Sat, 16 Jun 2007 08:17:00 -0300
From: assemblywoman <oakzb@chrisgale.wanadoo.co.uk>
To: sipbv6@mit.edu
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The following listener class responds to progress events by updating a
progress bar.
We have many software tools to do this but very few are simple, and most
were written by people that do not really understand our requirements.
The ImageRetriever class downloads a selected image from the thumbnail
list and displays it below the list.
Both invokeLater and invokeAndWait will execute their Runnable task
after all other tasks on the event dispatch queue have been processed.
Because the class constructor uses a list model, you know that the
worker thread will probably update the model directly. So a deadlock or
a loop situation may occur, and the program won't respond. You may need
a JVM expert from Sun and a database expert from Oracle. Finally, a
worker object has a progress property.
It's basically hidden by the JVM.
Override this method and make sure it contains or delegates the
thread's primary task.
How are you going to get the real problem resolved? Also, interacting
with Swing components or their default data models from initial or
worker threads is not a safe operation. As you will see later, it does.
If an application fails even briefly, it could cost millions of dollars
or, in a medical emergency, lives.
JTop sorts threads by the amount of CPU usage, allowing you to easily
detect a thread that is using inordinate amounts of CPU time.
As ImageRetriever downloads images using the ImageIO API, it calls the
setProgress method to update its progress property.
Using a SwingWorker instance, the application can put individual images
in the list as they arrive instead of waiting for the entire list.
Many applications start their UI as follows, but this is not the right
way to start the UI: public class MainFrame extends javax.
When implementing a SwingWorker subclass, you must specify the return
value type of the doInBackground and get methods. However, a worker
thread can produce and publish intermediate chunks of data too. A
customer was having static versioning issues that severely impacted its
desktop trading application.
