Package PamController

Class AWTScheduler

java.lang.Object
PamController.AWTScheduler
public class AWTScheduler extends Object
Class to schedule SwingWorker tasks so that they execute one at a time. SwingWorkers do of course do their work in a different thread to the AWT thread. The point of this scheduler is to ensure that they execute one by one, can themselves update the GUI (for instance with progress bars or text output) but that the GUI itself is locked for user input to avoid problems causes by impatient users.
Author:
Doug Gillespie

  • Method Details

    • getInstance

      public static AWTScheduler getInstance()
      Get singleton instance.
      Returns:
      singleton instance of AWTScheduler.

    • scheduleTask

      public int scheduleTask(Runnable swingWorker)
      Schedules a task for execution. Starts from the AWT thread, but SwingWorker execution is in a different thread.

      This function will always return immediately, using invokeLAter to start the task on AWT when the function calling this has completed.

      Parameters:
      swingWorker - Prepared swing worker to execute
      Returns:
      number of tasks in the queue in front of this task.

    • startNextTask

      public void startNextTask()
      Start the next task in the list.

      If it's a SwingWorker, then run it as a scheduled worker task which will handle the disabling and re-enabling of the PAMGUARD GUI.

      If it's a plain old runnable, then just send it off to the AWT thread with invoke later and go straight on to setting up the task after it.