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

Method Summary

Methods

Modifier and Type	Method and Description
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

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

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.