Package rma.util.debug

Class MonitorEdtQueue

java.lang.Object

java.awt.EventQueue

rma.util.debug.MonitorEdtQueue

public final class MonitorEdtQueue
extends EventQueue

Monitors the AWT event dispatch thread for events that take longer than a certain time to be dispatched. The principle is to record the time at which we start processing an event, and have another thread check frequently to see if we're still processing. If the other thread notices that we've been processing a single event for too long, it prints a stack trace showing what the event dispatch thread is doing, and continues to time it until it finally finishes. This is useful in determining what code is causing your Java application's GUI to be unresponsive.

The original blog can be found here
Automatically detecting AWT event dispatch thread hangs

Field Summary

Fields

Modifier and Type	Field	Description
static final String	PROP

Method Summary

Modifier and Type	Method	Description
protected void	dispatchEvent(AWTEvent event)	Overrides EventQueue.dispatchEvent to call our pre and post hooks either side of the system's event dispatch code.
static void	initMonitoring()	Sets up hang detection for the event dispatch thread.
static void	main(String[] args)
static Boolean	possiblyInstall()	Calls MonitorEdtQueue.initMonitoring() if MonitorEdtQueue.PROP is true.

Methods inherited from class java.awt.EventQueue

createSecondaryLoop, getCurrentEvent, getMostRecentEventTime, getNextEvent, invokeAndWait, invokeLater, isDispatchThread, peekEvent, peekEvent, pop, postEvent, push

Methods inherited from class java.lang.Object

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

Field Details

PROP

public static final String PROP

See Also:

• Constant Field Values

Method Details

initMonitoring

public static void initMonitoring()

Sets up hang detection for the event dispatch thread.

dispatchEvent

protected void dispatchEvent(AWTEvent event)

Overrides EventQueue.dispatchEvent to call our pre and post hooks either side of the system's event dispatch code.

Overrides:

dispatchEvent in class EventQueue

possiblyInstall

public static Boolean possiblyInstall()

Calls MonitorEdtQueue.initMonitoring() if MonitorEdtQueue.PROP is true.

Returns:

true if the install method was called.

main

public static void main(String[] args)