On 8/6/07, Trustin Lee <[EMAIL PROTECTED]> wrote:
>
> On 8/6/07, leafsax <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> > I was trying to use MINA to transfer files between machines. It was
> pretty
> > good when I was trying to send some small files, but when the requests
> were
> > larger, (a file > 100M), I could not send the file correctly. Since I
> could
> > not send the file in just one ByteBuffer, I read some of the file and
> send,
> > then read the rest of the file and send. But, the file received is not
> equal
> > to the file sent by the server. The file length is correct, but the
> contents
> > were interleaved.
> >
> > The following is the code to send file in server side:
> > private void sendFile(IoSession session, String fileName) throws
> > FileNotFoundException {
> > byte[] buffer = new byte[1024];
> > DataInputStream dis = new DataInputStream(new
> FileInputStream(fileName));
> > int bytesRead = 0;
> > try {
> > System.out.println("send file");
> > while ((bytesRead = dis.read(buffer, 0, 1024)) >
> 0) {
> > session.write(ByteBuffer.wrap(buffer, 0,
> bytesRead));
> > }
> > } catch (IOException e) {
> > // TODO Auto-generated catch block
> > e.printStackTrace();
> > }
> > }
> > Some questions:
> > Is there any misuse of session and request in the code above?
> > Is there any good suggestions to do file or large request transfer in
> MINA?
>
> You need to allocate the buffer for each read. Otherwise, the data
> written will be garbled because the background I/O processor threads
> will be accessing the same buffer instance while you read something in
> there.
>
> The best practice is to insert a StreamWriteFilter into the filter
> chain and write an InputStream of a file like the following:
>
> session.getFilterChain().addLast("streamWriter", new StreamWriteFilter());
> ...
>
> FileInputStream in = new FileInputStream(....);
> session.write(in);
So the mina core will take care of "in"? For instance, cut the "in" into
piece to send one by one? Otherwise, the data written will still be garbled
for large data?
HTH,
Trustin
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