How to write clear code with logging?

Question

logging is cluttering my "beautiful" clean simple short code. instead of a simple

def mymethod = dosomething // scala

my code is also having also all these nasty logging statements which and immediately i have to add new lines and curly braces to mymethod. now i don't like AOP it would just make clear code --> unclear. anyway to get over this? I have when simple code turns to less simple, but i also need logging. help.

how to make this code clear simple short and also with logging?

That is some nasty way to formulate a simple question. – Nikita Volkov May 22 '14 at 12:53 — Nikita Volkov, May 22 '14 at 12:53
What does this have to do with haskell? – dfeuer May 22 '14 at 14:47 — dfeuer, May 22 '14 at 14:47

score 7 · Answer 1 · answered May 22 '14 at 12:10

A typical approach in functional programming would be to add a higher-order logging combinator.

log :: IO a -> String -> IO a 
log f s = do
    v <- f
    print ("My message: " ++ s)
    return v

Such a wrapper augments evaluation of a function with a log message. The general pattern is \x y -> .. something with y .. return x

score 5 · Accepted Answer · edited May 23 '17 at 10:26

5

Kestrel combinator is commonly used for this:

def mymethod = dosomething.tap(x => log.info(s"I've done ... and got $x"))

If you need to do this for any method, there is scala virtualized, which allows to overload some of the language concepts, including method calls, I guess. Plus, somebody might propose to look at the macro, but I'm not competent enough to make this assumptions.

edited May 23 '17 at 10:26

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answered May 22 '14 at 11:46

om-nom-nom

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How to write clear code with logging?

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