Handling of Progress Information

It is possible to create a monitor for the progress of the solver. This monitor can also be used to cancel long running simulations if desired.

The progress information is made available using two different classes: SwingProgressPanel is used to display the progress in the GUI, and SwingDemoProgressContext is used to handle the communication between COMSOL Multiphysics and the areas the application that needs information about progress.

SwingDemoProgressContext extends SwingProgressContext, which is described in the reference section at the end of this chapter.

Both classes are added by copying two files instead of writing them from scratch.

1	Use the mouse to drag and drop these files to the src folder shown in the Package Explorer in Eclipse: SwingDemoProgressContext.java and SwingProgressPanel.java.

2	Open the BeamModelDemo.java file and navigate to the start method.

3	Add these lines before the call to frame.visible

SwingProgressPanel progressPanel = new SwingProgressPanel();

mainPanel.add(progressPanel, BorderLayout.PAGE_END);

progressPanel.updateProgressLog("Starting\n");

ProgressWorker.setContext(new SwingDemoProgressContext(progressPanel));

4	These lines are added to the progress panel to the bottom of the main window and the context is set up between COMSOL and the user application.

5	In order to show any progress in the GUI, the solver must not run in the main thread. This means that a separate thread for the solver is created. Create the following solve method by removing the corresponding lines from the start method:

private void solve() {

  ProgressWorker.run(new Runnable() {

    public void run() {

      model.sol("sol1").runAll();

      model.result("pg1").set("window", "window1");

      model.result("pg1").run();

    }

  });

}

6	Remember to add a call to the solve method at the end of the start method.

7	Run the application by right-clicking BeamModelDemo.java in the Package Explorer and select Run as>Java Application.

8	The application window opens and shows progress information while starting and solving.