Replacing EventQueue with my own implementation...

Question

Hi all,
I can't seem to figure out if when I use the EventQueue.push() method to put my own event queue, if it actually replaces the old one OR just adds it to the end of the eventqueue array? The API says it replaces it, but within the code it seems that when you push one, it navigates to through the nextQueue until it gets to the end then adds the one you are pushing as the end. The reason I ask this is that if an application puts one in place, then I add one myself, I dont want to replace the one there, just add mine so that both get used. The reason is, we use a simple WaitCursorEventQueue AND I need to push one to add a global hot key, and I dont want to remove the application one, otherwise it could mess something up. So by "pushing" mine, am I replacing the one that was there and it is never used again until I remove mine?
If so, perhaps a better way is to grab the one that is there, and "chain" to it when I insert mine, such that if the processing I am waiting for doesn't occur, rather than call super.eventDispatch(), I call the old ones postEvent() or invokeLater() method?
Thanks.

Answer 1

uncle_alice,
Thanks for the info. You may be right.. the way you say that it does make sense. If you look at the code for dispatchEvent it does NOT loop through or go through the linked list of queues to dispatch events. Unless there is some behind the scenes code I am missing, it seems likely that it only goes to the event queue in place. More so, what pretty much locks this assumption is that when you open up a dialog and it temporarily inserts its own dispatch event queue, it does so to stop events from going to the main window underneath, hence it effectively replaces it. If it did what I was asking, then you couldn't achieve the modal capability that it does, because the main event queue would still get events as well, unless of course you did not make a call to super.dispatchEvent()...??
Oh well, so the solution for me is to either combine them, which I can't do, or to modify them (since I have access to both source files) so that they "chain" together. One if for my test stuf... I put in a hot-key watch to allow me to stop a test in action. The other is the one expected as part of the application, to change the cursor if an event takes more than 1/2 second to process. The good thing, at least, is during testing it is not a big deal if the cursor doesn't change. But I can see where my test framework may be used in an application that depends on the custom eventqueue that is in place, and displacing it could have disasterous effects.