> FileUtils.copyFile for the locked file (windows)
> Key: IO-376
> URL: https://issues.apache.org/jira/browse/IO-376 > Project: Commons IO
> Issue Type: New Feature
> Components: Streams/Writers
> Affects Versions: 2.4
> Environment: Windows
> Reporter: Peter B.
> Priority: Minor
> The use case:
> - log4j writes to the file using RollingFileAppender.
> - in parallel I need to read the file contents for later manipulation (storing it's contents elsewhere)
> Problem on windows:
> - I open FileInputStream for reading from file
> - when using IOUtils.copy(InputStream input, OutputStream output) exception is thrown:
> java.io.IOException: The process cannot access the file because another process has locked a portion of the file
> It would be great to have API enabling to copy contents of the locked file (on windows) to OutputStream.
> The method available in the API currently:
> FileUtils.copyFile(File input, OutputStream output)
> does the job, except for the files that are locked (in the windows environment) as they're currently written to.
> Some of the functionality is already in use in the: Tailer
> However (non-bloked) copying full contents is not provided.
> I'd need to retrieve a snapshot of the file.
> Not sure about the right API, but generally I see 2 options:
> - custom (File)InputSteam implementation or maybe
> - custom FileUtils.copyFile(File input, OutputStream output)
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