How to add observable behaviour in existing code?

Hi everyone, I'm new to design patterns. I have an existing numerical analysis package that I use to find roots using multiple strategy (bisection, secant, newton, etc). I want to show the process of root finding for every iterations taken by the algorithm (for example, iteration 0: left = 0, mid = 0.5, right = 1; iteration 2: left = 0, mid = 0.25, right = 0.5; ... etc. Its not exactly like that, I want to show it graphically, but you see what I mean). Looks like I need Observer to add event handling to notify the change of state in each initial guess as well as signaling the event when a root is/isn't found. But the solver classes doesn't seem to be implementing Observable, they just give out the answer, or not. How do I add Observer pattern without modifying the original code? I thought about using Decorator and having the real solver do the root finding but it just doesn't make sense to me. Thanx in advance.

endasil wrote:
georgemc wrote:
endasil wrote:
georgemc wrote:
That won't get you intermediate results, though.If the method being observed needs to be firing multiple events per invocation, no, it won't.
@OP, you were on the right track with the decorator pattern (indeed, that could be just as appropriate). What made you think it was wrong?I think that's the OP's tripping point:
I want to show the process of root finding for every iterations taken by the algorithm
...But the solver classes doesn't seem to be implementing Observable, they just give out the answer, or not.
Aha. Bytecode weaving (or plain old decompiling and nicking the source) then.Nope, I didn't. You're just too damned fast!For my own good! I hit "post" and immediately go "I forgot to say X" :-/
@OP: if you want to see some examples of using bytecode weaving to introduce observableness to existing code, have a look at the sources for a test coverage tool like Cobertura. That's basically what they do. If you've never done it before, it'll take you a fair bit of head-scratching and sideways thinking to get your head round it all, but stick with it. Be prepared to learn a bit about opcodes as well. Or maybe just plundering the sources for this library is the way to go, not that I'm advocating that ;)

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