Rejuvenate logging statement levels

[khatchad]

Introduction

We are in the process of evaluating our research prototype Eclipse plug-in that "rejuvenates" log statement levels based on how "interesting" the enclosing methods are to the developers. The assumption is that methods that are worked on more and more recently by developers should have higher log levels (e.g., INFO as compared to FINEST). Our end goal is to reduce information overload, as well as alleviate developers from manually making log level changes.

The transformation decision is made by analyzing the "degree of interest" (DOI) values of enclosing methods for logging invocations. DOI value is a kind of real number for a program element which shows how developers are interested in it. It is computed from the interaction events between developer and element, such as developer edits the element. In this project, we compute the DOI using the project's git history.

We are looking for feedback on our tool from developers. If you can, we would appreciate if you can comment on each of the transformations in the case that this PR is not accepted. Of course, we would also love to contribute to your project.

Settings

We have several analysis settings . We can vary these settings and rerun our if you desire. The settings we are using in this pull request are:

• Treat CONFIG/WARNING/SEVERE level as a category and not a traditional level, i.e., our tool ignores CONFIG/WARNING/SEVERE log level (setting 1).
• Never lower the logging level of logging statements within catch blocks (setting 2).
• The greatest number of commits evaluated: 5000 (setting 3).

The head at time of analysis was: 9ce52a2

Notes

We manually initialized two variables to null in a test class because the compiler in Eclipse was complaining about them. We can revert this change if you desire.

OCA

I signed and emailed the OCA to Oracle. I am also providing a written acceptance of the OCA line:

I am signing on behalf of myself as an individual and no other person or entity, including my employer, has or will have rights with respect my contributions.

[coveralls]

Pull Request Test Coverage Report for Build 4220

• 82 of 143 (57.34%) changed or added relevant lines in 37 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 73.603%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/executables/ELFAnalyzer.java	1	2	50.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/configuration/RuntimeEnvironment.java	1	2	50.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/FileHistoryCache.java	4	5	80.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/SubversionHistoryParser.java	0	1	0.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/index/PendingFileCompleter.java	4	5	80.0%
opengrok-web/src/main/java/org/opengrok/web/WebappListener.java	0	1	0.0%
plugins/src/opengrok/auth/plugin/LdapFilterPlugin.java	0	1	0.0%
plugins/src/opengrok/auth/plugin/UserPlugin.java	0	1	0.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/AccuRevRepository.java	0	2	0.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java	5	7	71.43%

Totals
Change from base Build 4217:	0.02%
Covered Lines:	33674
Relevant Lines:	45751

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💛 - Coveralls

[khatchad]

Superseded by #2978.