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https://issues.apache.org/jira/browse/LUCENE-5577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss resolved LUCENE-5577.
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Resolution: Fixed
> Temporary folder and file management (and cleanup facilities)
> -------------------------------------------------------------
>
> Key: LUCENE-5577
> URL: https://issues.apache.org/jira/browse/LUCENE-5577
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
> Fix For: 4.8, 5.0
>
>
> This is a spinoff of the work [[email protected]], Uwe and me have
> initiated in SOLR-5914.
> The core concept is this:
> * every test should create its temporary folders and files in a sub-folder of
> one, easily identifiable, parent.
> * the parent folder is named after the test class, with [org.apache.] removed
> for brevity. the folder name includes the master seed and a generated
> sequence integer, if needed, to easily demarcate different runs (and identify
> which run produced which files).
> * temporary folder/ file creation routines should be available in LTC, so
> that no additional imports/ fiddling is needed.
> {code}
> LTC#createTempDir()
> LTC#createTempDir(String prefix)
> LTC#createTempFile()
> LTC#createTempFile(String prefix, String suffix)
> {code}
> Note the absence of "create a temporary file/dir under a given directory"
> method. These shouldn't be needed since any temporary folder created by the
> above is guaranteed to be empty. If one still needs temporary file creation
> use createTempDir() and then relevant File class methods.
> * any temporary folders and files should be removable at the end of the suite
> (class), if all tests completes successfully. Failure to remove any files
> should be marked as an error (will manifest itself on windows with open file
> handles).
> * there should be a way to temporarily mark a class to circumvent the above
> check (SuppressTempFileChecks annotation for known offenders). Annotating a
> class with SuppressTempFileChecks will still attempt to remove temporary
> files, but will not cause an error if this fails. Any files that couldn't be
> deleted will be printed to stdout with an appropriate message.
> * there should be a way for developers to leave temporary files on disk for
> further inspection (even in case of successful runs). The following system
> properties will work:
> {code}
> "tests.leavetmpdir" /* default */,
> "tests.leaveTemporary" /* ANT tasks's (junit4) flag. */,
> "tests.leavetemporary" /* lowercase version of the above */,
> "solr.test.leavetmpdir" /* Solr's legacy property for backcompat */))
> {code}
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