Let me understand, it seems to be easy, but it's not anymore:
How can I change the signature of messageReceived(IoSession session, Object
message) for messageReceived( ByteBuffer source, IoSession session ) and
make the handler response to that?
while( source.hasRemaining() ) {
ByteBuffer buffering = session.getAttribute("BUFFER_NAME"); //here
it's ok I create a bytebuffer on the request with the size I need and pass
to it by attribute;
if( buffering != null ) { //if I'm passing that by attribute it will
always be null
// must be a new data
int size = source.getInt();
buffering = ByteBuffer.allocate( size );
buffering.put(source);
if( buffering.hasRemaining() ) {
session.setAttribute("BUFFER_NAME", buffering );
return;
} else {
// message is complete
session.removeAttribute("BUFFER_NAME");
String data = new String( buffering.array(), 0, buffering.limit(),
"ISO-8859-1");
}
} else {
buffering.put(source); //heres eclipse is telling that at
this point it can only be null
if( !buffering.hasRemaining() ){
// message is complete
session.removeAttribute("BUFFER_NAME");
String data = new String( buffering.array(), 0,
buffering.limit(), "ISO-8859-1");
} else {
return;
}
}
Thanks again.
-----Mensagem original-----
De: Jon V. [mailto:sybersn...@gmail.com]
Enviada em: segunda-feira, 2 de setembro de 2013 23:43
Para: users@mina.apache.org
Assunto: Re: Send/Receive IoBuffer
On Mon, Sep 2, 2013 at 10:21 PM, Luciano Coelho
<luci...@lvcsistemas.com>wrote:
> Yeah Jon, you're right about flush, the wrong thing is really the
IoBuffer.
> I put the: session.getConfig().setReadBufferSize(16*1024), on
> connector as you told me.
>
> I changed now for what you answered me, like this:
>
> if(size > 0){
> while (buffer.hasRemaining()){
> byte[] payload = new byte[size];
> buffer.get(payload);
> data = new String( payload, "ISO-8859-1");
> }
> }
>
Ok - Mina does not allow for compound rx_buffers. This means you are going
to have to manually buffer the message yourself.
received( ByteBuffer source, IoSession session ) { while(
source.hasRemaining() ) { ByteBuffer buffering = session.getAttribute(
SOME_PROPERTY_BUFFER_NAME );
if( buffering != null )
{
// must be a new data
int size = // read size somehow
buffering = ByteBuffer.allocate( size );
buffering.put(source);
if( buffering.hasRemaining() )
{
session.setAttribute( SOME_PROPERTY_BUFFER_NAME, buffering ); return;
}
else
{
// message is complete
session.clearAttribute( SOME_PROPERTY_BUFFER_NAME ); String data = new
String( buffering.array, buffering.offset, buffering.limit, "ISO-8859-1");
}
}
else
{
buffering.put(source);
if( !buffering.hasRemaining() )
{
// message is complete
session.clearAttribute( SOME_PROPERTY_BUFFER_NAME ); String data = new
String( buffering.array, buffering.offset, buffering.limit, "ISO-8859-1");
} else { return; } } } }
In MINA you have to read everything out of that ByteBuffer or it will be
lost forever. This means you could get stuck only having 2 bytes in the
buffer and not enough to read the size value. So you may have to setup a
secondary buffer to store partial size values if that scenario does occur.
>
> I'm receiving from de server 2685 bytes and I set the buffer to
> 64*1024, and I'm still having the error: D/WEB(26934):
> java.nio.BufferUnderflowException.
>
> I saw that setting tcpnodelay = false becomes better, I got make 3
> requests without error, but after the error happens again, and I have
> to restart the session again.
> Do I have to finish something in the IoBuffer after receive the data?
> Note that I'm not opening another session, I open one time and stay
> changing data all the time. The rest is functioning very well, one by
> one minute I send something and the server answer quickly, the only
> problem now is this big request that one time goes another time not.
>
> Thank's again.
>
> LUCIANO
>
> -----Mensagem original-----
> De: Jon V. [mailto:sybersn...@gmail.com] Enviada em: segunda-feira, 2
> de setembro de 2013 19:26
> Para: users@mina.apache.org
> Assunto: Re: Send/Receive IoBuffer
>
> On Mon, Sep 2, 2013 at 5:37 PM, Luciano Coelho
> <luci...@lvcsistemas.com>wrote:
>
> > Hello everybody.
> >
> >
> >
> > I'm learning how to use Mina and my questions are:
> >
> >
> >
> > I solved my problem of having a answer from my server without
> > closing the session like this:
> >
> >
> >
> > System.out.flush();
> >
>
>
> This really gives me an indication of your Java knowledge. System.out
> is your access to stdout in Java. It is what you use to print things
> to the console. It has nothing to do with your application.
>
> Maybe posting on StackOverflow would be a good idea for general java help?
>
>
> >
> >
> >
> > Is that ok?
> >
> >
> >
> > I'm receiving the answer in Android via GPRS like this:
> >
> >
> >
> > First I set this on sessionCreated
> >
> > session.getConfig().setReadBufferSize(16*1024);
> >
> >
> >
> You should set this in Mina config. It is not good to change on the
> fly like this.
>
> Read the Quick Start Guide:
> http://mina.apache.org/mina-project/quick-start-guide.html
>
>
> >
> > @Override public void messageReceived(IoSession session, Object
> > message) throws Exception {
> >
> > IoBuffer buffer
> > = (IoBuffer) message;
> >
> > int service
> > = (Integer) session.getAttribute("SERVICE");
> >
> > Listener listener
> > = (Listener) session.getAttribute("LISTENER");
> >
> > String data
> > = "";
> >
> > int size
> > = buffer.getInt();
> >
> > while (buffer.hasRemaining()){
> >
> > data += (char) buffer.get();
> >
>
> Using the += is the worst possible way to build a String.
>
> Since you are reading a String. Are you sure that the String is
> encoded using 8 bits?
>
> byte[] payload = new byte[size];
> buffer.get(payload);
>
> String data = new String( payload, "UTF-8");
>
>
>
> >
> > }
> >
> > if(size == data.trim().length()){
> >
>
> Why are you trying to trim the string? Are you expecting whitespaces?
>
>
> >
> > if(listener != null)
> > listener.requisitionFinished(data, service);
> >
> > } else {
> >
> > if(listener != null)
> > listener.requisitionFinished("", service);
> >
> > }
> >
> > Log.d("WEB", "SERVICE: " + service + " SIZE: " + size +
"
> > DATA: " + data);
> >
> > }
> >
> >
> >
> > Sometimes I receive the data in parts, when the message arriving is
> > too long and it causes an error, even if the buffersize is bigger
> > than the data I'm receiving.
> >
> >
> >
> > Thank's a lot.
> >
> >
> >
> > Luciano Coelho
> >
> >
>
>
