Wednesday, July 11, 2012

3 types of high-level external events - swing

An entire swing app is event driven - either 1) user events, 2) "mkt data" events, or (rarely) scheduled timer events. Without these events, entire swing app is idle.

Therefore, event handling logic permeates swing apps.

Actually "Mkt data" event is a misnomer since it can be any external data from MOM, from database response, from loading a file, from RMI response, from a web service response...

These 3 types of external events are not AWTEvents, but "happenings". They can generate internal events, typically AWTEvents. For example, if a user event hits a JButton, the event handler in the button could fire an AWT event on a TableModel. The TableModel event handler can then modify table data and fire another event to update the screen.

Swing has a notion of low-level events vs semantic events. My 3 types are semantic.

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