How does SonarQube measure the complexity of Java 8 lambda expressions?

[Joerg]

Hello,

Is there any documentation available on how SonarQube measures the complexity of Java 8 lambda expressions (or if it does at all)?

In the SonarQube documentation, I have found only this page here, but there is nothing mentioned on lambda expressions.

http://docs.sonarqube.org/display/SONAR/Metrics+-+Complexity

Thanks in advance.

Kind Regards,

Joerg

[Freddy Mallet]

Hi Joerg,

This is a kind of fundamental question and to be honest we haven't yet took any decision on this point, see https://jira.sonarsource.com/browse/MMF-151. 

Because obviously when Mc Cabe specified the way to compute the Cyclomatic Complexity there were mainly some very high level entry points (in COBOL programs for instance) and no concept of closures. From a purely theoretical point of view, each lambda should be considered as a method and so should increment at least by one the CC but on the other hand in term of human readability, I think that would be a mistake to increment the CC.

If you are aware of any academical publication on this subject, please share it :)

Thanks

Freddy

 

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Freddy MALLET | SonarSource

Product Director & Co-Founder
http://sonarsource.com