http://www.osnews.com/story/17740/C_Callback_and_Event_Mechanisms Exploring the Future of Computing en-us Copyright 2001-2009, David Adams adam+nospam@osnews.com Mon, 06 Jul 2009 17:36:40 GMT http://www.osnews.com/images/osnews.gif http://www.osnews.com http://osnews.com/thread?232897 http://osnews.com/thread?232897 Yeah, it's a shame, all that polling logic I've written in Java because I don't understand how to use java.util.Observable, or the various event listener interfaces most frameworks provide. Sun, 22 Apr 2007 12:45:00 GMT donotreply@osnews.com (joshv) Comments http://osnews.com/thread?232904 http://osnews.com/thread?232904 I do so hope that was ironic... Sun, 22 Apr 2007 13:28:00 GMT donotreply@osnews.com (Matzon) Comments http://osnews.com/thread?232917 http://osnews.com/thread?232917 I thought this is why we used the delegate event model, or the event subscriber model, so that we didn't have to monitor all this stuff? Sun, 22 Apr 2007 15:09:00 GMT donotreply@osnews.com (nberardi) Comments http://osnews.com/thread?232922 http://osnews.com/thread?232922 No, I was serious. Sun, 22 Apr 2007 15:56:00 GMT donotreply@osnews.com (joshv) Comments http://osnews.com/thread?232928 http://osnews.com/thread?232928 The Observer pattern is one of the most used patterns (except maybe for Singleton). It's easy to implement and use - and to understand!
You might want to read the following book, which should be in every OO programmers library:
Design Patterns: Elements of Reusable Object-Oriented Software Sun, 22 Apr 2007 16:37:00 GMT donotreply@osnews.com (Matzon) Comments http://osnews.com/thread?232936 http://osnews.com/thread?232936 Next time I will use the slashdot-style [sarcasm][/sarcasm] tags. Sun, 22 Apr 2007 17:37:00 GMT donotreply@osnews.com (joshv) Comments http://osnews.com/thread?232957 http://osnews.com/thread?232957 "I thought this is why we used the delegate event model, or the event subscriber model, so that we didn't have to monitor all this stuff?"

You are absolutely 100% correct. I have no idea why the author went through all the pains of setting up all the callbacks/polling/whatever you want to call it, by hand in this example when delegates (Name EventHandler delegates) would have more than sufficed, as well as made the code much more readable, and smaller.

It's almost like he went out of his way to do it the Java way ;-). Sun, 22 Apr 2007 18:43:00 GMT donotreply@osnews.com (jayson.knight) Comments http://osnews.com/thread?233001 http://osnews.com/thread?233001 Yeah I am just going to assume that this author closely relates to this article. http://worsethanfailure.com/Articles/The_Complicator_0x27_s_Bicycle... Sun, 22 Apr 2007 22:37:00 GMT donotreply@osnews.com (nberardi) Comments http://osnews.com/thread?233032 http://osnews.com/thread?233032 Events and delegates are cool. Not sure why this author has to do it the hard way. Mon, 23 Apr 2007 02:05:00 GMT donotreply@osnews.com (siimo) Comments