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Re: Logging database statement duration in a DRY way

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On 8/19/2016 8:32 AM, Cecil Westerhof wrote:
> I like to log the time it takes for certain database actions. At the
> moment I do this like this:
>     startTime = System.nanoTime();
>     ps = conn.prepareStatement(insertLine);
>     ps.setString(1, className);
>     ps.setLong(  2, pid);
>     ps.setLong(  3, free);
>     ps.setLong(  4, rt.maxMemory() / divideValue);
>     ps.setLong(  5, total);
>     ps.executeUpdate();
>     ps.close();
>     stopTime = System.nanoTime();
>     logMessage(String.format("preparedStatement saveMemoryLineNoGC took %f milliseconds",
>                              (stopTime - startTime) * 1E-6));
>
> This works, but I need to copy the first and last two statements and
> edit the last one, so I was wondering if this could be done more DRY
> (Do not Repeat Yourself). In C(++) you would use a macro, but as far
> as I know this is not possible with Java.

     I suppose you could put the "guts" in an instance implementing a
suitable interface and hand the instance to a time-it-and-log-it
method.  You might end up with something like

	static void timeAndLog(String label, Runnable thing) {
	    long startTime = System.nanoTime();
	    thing.run();
	    long stopTime = System.nanoTime();
	    logMessage(String.format("%s took %f milliseconds",
	        (stopTime - startTime) * 1E-6);
	}

	// ...

	timeAndLog("preparedStatement saveMemoryLineNoGC", () -> {
	    ps = conn.prepareStatement(insertLine);
	    // ...
	    ps.close();
	});

Only you can judge whether this is worth while.

-- 
esosman@comcast-dot-net.invalid
The Tooth Fairy has gone high-tech, now pays in Bitecoin.

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Thread

Logging database statement duration in a DRY way Cecil Westerhof <Cecil@decebal.nl> - 2016-08-19 14:32 +0200
  Re: Logging database statement duration in a DRY way Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-19 09:05 -0400
    Re: Logging database statement duration in a DRY way Cecil Westerhof <Cecil@decebal.nl> - 2016-08-19 20:54 +0200
  Re: Logging database statement duration in a DRY way Cecil Westerhof <Cecil@decebal.nl> - 2016-08-19 15:12 +0200
    Re: Logging database statement duration in a DRY way Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-19 10:01 -0400
    Re: Logging database statement duration in a DRY way Arne Vajhøj <arne@vajhoej.dk> - 2016-08-19 22:17 -0400
      Re: Logging database statement duration in a DRY way Arne Vajhøj <arne@vajhoej.dk> - 2016-08-19 22:37 -0400
  Re: Logging database statement duration in a DRY way Martin Gregorie <martin@address-in-sig.invalid> - 2016-08-19 16:05 +0000
    Re: Logging database statement duration in a DRY way Eric Douglas <e.d.programmer@gmail.com> - 2016-08-19 10:06 -0700
  Re: Logging database statement duration in a DRY way Steven Simpson <ss@my.domain.invalid> - 2016-08-19 22:34 +0100

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