PamController
Class AWTScheduler

java.lang.Object
  PamController.AWTScheduler

public class AWTScheduler
extends java.lang.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

Nested Class Summary

private class	AWTScheduler.ScheduledWorkerTask USed by InvokeLater to start a SwingWorker task.
private class	AWTScheduler.WorkerPropertyChangeListener

Field Summary

private PamController	pamController
private static AWTScheduler	singleInstance
private java.util.List<java.lang.Runnable>	taskList

Constructor Summary

private

AWTScheduler()

Method Summary

static AWTScheduler	getInstance() Get singleton instance.
int	scheduleTask(java.lang.Runnable swingWorker) Schedules a task for execution.
void	startNextTask() Start the next task in the list.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

singleInstance

private static AWTScheduler singleInstance

pamController

private PamController pamController

taskList

private java.util.List<java.lang.Runnable> taskList

Constructor Detail

AWTScheduler

private AWTScheduler()

Method Detail

getInstance

public static AWTScheduler getInstance()

Get singleton instance.

Returns:

singleton instance of AWTScheduler.

scheduleTask

public int scheduleTask(java.lang.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.