Hello Jens, Thank you for your interest in JMeter. Interesting study. 1 question on it: - Clicking on the provided link, how can we see this analysis of "stable API" ?
Some answsers, only my 2 cents: - We take care in the project not to break existing behaviour unless clearly documented in changes, but I don't see a direct link with API. - We also tend to conserve backward compatibiliy regarding properties (and related behaviour) and the "public" APIs , among them I see: - SampleResult - JMeterVariables - JMeterContext - Sampler - BeanInfoSupport - Regarding "internal APIs" more related to plugin development, we nearly have an Abstract base class for all of them in order to ease changes without breaking subclasses, but this can happen, I remember it happened in version 2.10 I think - We have a number of Unit Test and Overall Tests (that run JMeter on Sample Test plans) that we maintain accross versions - Regarding version numbers, our policy is to increase the second number for major versions and the last one for hotfixes. The first one is in fact very rarely updated and maybe sebb can answer on why a switch from 1.9.1 to 2.0.1 occured in the past Regards Philippe M. @philmdot On Mon, Oct 20, 2014 at 3:34 AM, Jens Dietrich <[email protected]> wrote: > Hi all, > > My name is Jens Dietrich, I am an academic from Massey Uni in NZ. > > We recently did a study on (binary and src) compatibility in Java > programs using the Qualitas Corpus dataset of about 100 real-world > Java programs. JMeter is part of this data set (see > > http://qualitascorpus.com/docs/catalogue/20130901/corpus_catalogue-jmeter.html > for some extracted stats), and is unique as it was one of only two > programs (the other one being FreeCol) that are "API stable", i.e., we > did not detect API-breaking changes (like changing the signatures or > API methods) between versions. > > I wonder whether somebody could offer some insights why this is the > case. Are there any particular project-specific policies to ensure API > stability, and if so, how are they enforced? Also, how are the > decisions about version numbers being made ? > > Any help is highly appreciated ! > > Cheers, Jens > -- Cordialement. Philippe Mouawad.
