[jira] [Created] (IO-598) FileUtils.moveFile should support atomic file replacement; introduce FileUtils.renameTo to force target file replacement?

["Mark (JIRA)" <ji...@apache.org>]

Mark created IO-598:
-----------------------

             Summary: FileUtils.moveFile should support atomic file replacement; introduce FileUtils.renameTo to force target file replacement?
                 Key: IO-598
                 URL: https://issues.apache.org/jira/browse/IO-598
             Project: Commons IO
          Issue Type: Improvement
            Reporter: Mark


Looking at current openjdk (11) source code, the regular File.rename() method calls the standard native rename function on UNIX-like systems. At least on Linux, this allows me to (atomically?) replace a file with another one, ie. without deleting the target file.

 

FileUtils.moveFile however, throws an exception in case the target file alrady exists.

 

Here is the code bloat I currently use to rename-overwrite a file (and which I want to get rid of):


{code:java}
             // try to rename atomically first
            try {
                if (!tempFile.renameTo(mdFile)) {
                    throw new IOException();
                }
            } catch (Exception ex) {
                // then explicitly delete the target file first
                if (mdFile.exists()) {
                    mdFile.delete();
                }
                if (!tempFile.renameTo(mdFile)) {
                    throw new IOException("failed to rename " + tempFile + " to " + mdFile);
                }
            }
{code}

Can we please have a function that force-fully replaces existing target files, first atomically, then falling back to delete and move? Maybe call it FileUtils.renameTo and don't delete target directories, only target files.



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