How do I flush a 'RandomAccessFile' (java)?

Question

I\'m using RandomAccessFile in java:

file = new RandomAccessFile(filename, \"rw\");
...
file.writeBytes(...);

How can I ensure that this data i

Answer 1

I reached here with the very same curiosity.

And I really can't figure what need to flush on OS and not necessarily need to flush to Disk part means.

In my opinion,

The best thing matches to the concept of a managed flushing is getFD().sync(), as @AVD said,

try(RandomAccessFile raw = new RandomAccessFile(file, "rw")) {
    raw.write...
    raw.write...
    raw.getFD().sync();
    raw.wirte...
}

which looks like, by its documentation, it works very much like what FileChannel#force(boolean) does with true.

Now "rws" and "rwd" are look like they work as if specifying StandardOpenOption#SYNC and StandardOpenOption#DSYNC respectively while a FileChannel is open.

try(RandomAccessFile raw = new RandomAccessFile(file, "rws")) {
    raw.write...
    raw.write...
    raw.wirte...
    // don't worry be happy, woo~ hoo~ hoo~
}