Re: Logfile creation error during rotation

From:
dduck <anders.johansen@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
7 May 2007 05:56:56 -0700
Message-ID:
<1178542616.697369.285490@y5g2000hsa.googlegroups.com>
Here are the relevant bits of the FileHandler .java file. As far as I
can tell, the problem might be due to the renameTo command being
asynchronous in some cases - I am currently investigating if this
could be the case in our setup.

    <...>

    private void open(File fname, boolean append) throws IOException {
    int len = 0;
    if (append) {
        len = (int)fname.length();
    }
    FileOutputStream fout = new FileOutputStream(fname.toString(),
append);
    BufferedOutputStream bout = new BufferedOutputStream(fout);
    meter = new MeteredStream(bout, len);
    setOutputStream(meter);
    }

    <...>

    // Rotate the set of output files
    private synchronized void rotate() {
    Level oldLevel = getLevel();
    setLevel(Level.OFF);

    super.close();
    for (int i = count-2; i >= 0; i--) {
        File f1 = files[i];
        File f2 = files[i+1];
        if (f1.exists()) {
        if (f2.exists()) {
            f2.delete();
        }
        f1.renameTo(f2);
        }
    }
    try {
        open(files[0], false);
        } catch (IOException ix) {
        // We don't want to throw an exception here, but we
        // report the exception to any registered ErrorManager.
        reportError(null, ix, ErrorManager.OPEN_FAILURE);

    }
    setLevel(oldLevel);
    }

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