Re: need a better file copy method

I told him about getFD().sync() (for FileInput/OutputStream and
RandomFile.... It seems to be the only way to make sure things are
synchronously written to disk (local storage).

On 5/3/06, Stefaan A Eeckels <[email protected]> wrote:
> On Tue, 02 May 2006 14:38:50 -0700
> "Jim C." <[email protected]> wrote:
>
> > Stefaan A Eeckels wrote:
> > > On Mon, 01 May 2006 13:41:12 -0700
> > > "Jim C." <[email protected]> wrote:
> > >
> > >> Anyone know how a simple file copy can be accomplished in an
> > >> explicitly synchronous manner without adding Thread.sleep(n) after
> > >> calling flush on the output stream?
> > >
> > > Have you tried the streams method from the same site:
> > >
> > > http://javaalmanac.com/egs/java.io/CopyFile.html
> > >
> > Yes. Same problem.
>
> If you're doing the copy in a separate thread, you'll need to
> synchronize that thread (which is a producer) and the thread that needs
> the file (which is a consumer).
>
> wait()/notifyAll() can be used to ensure that a consumer will wait
> for the producer to terminate and vice-versa:
>
> public synchronized void useFile() {
>     while (copyDone =3D=3D false) try {
>         //Wait for copyFile to finish the copy.
>         wait();
>     } catch (InterruptedException e) { }
>
>
>     // Reset the flag
>     copyDone =3D false;
>     // Use the copy
>     performTestOnFile();
>     // Tell copyFile we're done
>     notifyAll();
> }
>
> public synchronized void copyFile(String src, String dst) {
>     while (copyDone =3D=3D true) try {
>         // Wait for the test to use the file copy
>         wait();
>     } catch (InterruptedException e) { }
>     try {
>         // Create channel on the source
>         FileChannel srcChan =3D new FileInputStream(src).getChannel();
>         // Create channel on the destination
>         FileChannel dstChan =3D new FileOutputStream(dst).getChannel();
>         // Copy file contents from source to destination
>         dstChannel.transferFrom(srcChan, 0, srcChan.size());
>
>         // Close the channels
>         srcChan.close();
>         dstChan.close();
>     } catch (IOException e) { }
>     copyDone =3D true;
>     // Tell the test method the file is ready
>     notifyAll();
> }
>
> Please note that I didn't test this :-)
>
> Alternatively, you can do the copy and execute the test in the same
> thread which would make sure the copy is finished before you get to
> executing the test.
>
> Take care,
>
> --
> Stefaan
> --
> As complexity rises, precise statements lose meaning,
> and meaningful statements lose precision. -- Lotfi Zadeh
>
>
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