Example code from SwingWorker documentation could have race condition?
- From: lionelv@xxxxxxxxx
- Date: 30 Jan 2007 22:34:28 -0800
I refer to the documentation of the get() method in SwingWorker found
at https://swingworker.dev.java.net/javadoc/org/jdesktop/swingworker/
SwingWorker.html#get()
It includes the following example code as a suggestion when you want
to block and wait for the SwingWorker to finish. I've put some numbers
in for easier explanation.
class SwingWorkerCompletionWaiter extends PropertyChangeListener {
private JDialog dialog;
public SwingWorkerCompletionWaiter(JDialog dialog) {
this.dialog = dialog;
}
4 public void propertyChange(PropertyChangeEvent event) {
5 if ("state".equals(event.getPropertyName())
6 && SwingWorker.StateValue.DONE ==
event.getNewValue()) {
7 dialog.setVisible(false);
8 dialog.dispose();
}
}
}
1 JDialog dialog = new JDialog(owner, true);
2 swingWorker.addPropertyChangeListener(
new SwingWorkerCompletionWaiter(dialog));
3 swingWorker.execute();
//the dialog will be visible until the SwingWorker is done
9 dialog.setVisible(true);
Is the execution path according to the numbers I've inserted above
possible? I would have thought that swingWorker.execute() could
potentially run the worker thread so quickly that it executes 8 before
9.
Would it not then block at 9?
Clarification would be great. I suspect there is something I'm missing
about what happens in SwingWorker.
Lionel.
.
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