> sorry to re-open this thread, but I am facing the same problem of 
> Nicolás.
> I like both yours (Doğacan) and Nicolas' ideas, more yours as I think 
> abstract
> classes are not good extension points.

That wasn't what I had proposed. My suggestion was to use an interface, 
as always, but made this API real clean, expressing the minimum the rest 
of the code needs from a scoring plugin, removing assumptions about its 
implementation. Then I've proposed to have an abstract class, 
implementing this interface, with a skeleton for any class which works 
"distributing score to outlinks". So we would have the best of both 
worlds: People creating new "PageRank" algorithms wouldn't need to 
reimplement anuything, they would just subclass the abstract class. And 
people like you and me would directly implement the interface (or use a 
different abstract class if there's common logic to share). My boss put 
all of this on hold, but I'd like to implement this idea in a near 
future and try to have it included in Nutch.


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