How to test if a file is “complete” (completely written) with Java

Question

Let\'s say you had an external process writing files to some directory, and you had a separate process periodically trying to read files from this directory. The problem to

Answer 1

One more method to test that a file is completely written:

private void waitUntilIsReadable(File file) throws InterruptedException {
    boolean isReadable = false;
    int loopsNumber = 1;
    while (!isReadable && loopsNumber <= MAX_NUM_OF_WAITING_60) {
        try (InputStream in = new BufferedInputStream(new FileInputStream(file))) {
            log.trace("InputStream readable. Available: {}. File: '{}'",
                    in.available(), file.getAbsolutePath());
            isReadable = true;
        } catch (Exception e) {
            log.trace("InputStream is not readable yet. File: '{}'", file.getAbsolutePath());
            loopsNumber++;
            TimeUnit.MILLISECONDS.sleep(1000);
        }
    }
}