you're right, I think I run exactly into the pitfall explained at http://mina.apache.org/tutorial-on-protocolcodecfilter.html: *TCP guarantees delivery of all packets in the correct order.* But there is no guarantee that one write operation on the sender-side will result in one read event on the receiving side.**
I think thats my problem Yes the code I am working on will go into the OpenMeetings Project. I am working on this to improve the Desktop Sharing and Recording. sebastian 2009/9/14 Ashish <[email protected]> > On Mon, Sep 14, 2009 at 9:22 PM, Sebastian Wagner <[email protected]> > wrote: > > hi, > > > > > > I have a Client-SocketConnector and Server-SocketAcceptor. So all about > TCP. > > I send TCP-Packets with a size of around 1200Bytes but I always receive > > Packages with a length of 2048, 4096, 8192, ... > > I mark all Packets that I do send with a sequence number before sending > => I > > see that packages are missing. > > > > So some packets are missing and others are much bigger. I guess TCP does > > wrap my packages together to have a optimal frame size when send over the > > network. > > Missing packets with TCP? this is something hard to believe. Can you > cross check again. > > > > > > > How do you deal with this? > > Actually it does not make sense to me that I send Packets of one size and > > receive something different. > > But anyway if this is the way TCP works (or optimizes the throughput) > thats > > fine ... but the problem is => how do I get my Packets in the same > > structure that I've send again? > > You have to assemble them using ProtocolDecoders. > > The way it works is, you have to know when your packet starts and end. > Either in form of a prefixed header etc. > Once you detect that, you need to consume the input till you detect > the end. This shall continue. > > Have a look at this > > http://mina.apache.org/report/trunk/xref/org/apache/mina/filter/codec/prefixedstring/PrefixedStringDecoder.html > > > > > What is your strategy for that? Make every packet *exactly* 1024 Bytes > and > > cut everything again on the Receivers end? > > Or am I on the complete wrong lane? > > Depends on what you need. You are on track, and hope you shall > complete your implementation soon. > Please do explore the examples, along with MINA Codec package > ( > http://mina.apache.org/report/trunk/xref/org/apache/mina/filter/codec/package-frame.html > ). > > By any chance are you exploring this to be used in openmeetings? > > -- > thanks > ashish > > Blog: http://www.ashishpaliwal.com/blog > My Photo Galleries: http://www.pbase.com/ashishpaliwal > -- Sebastian Wagner http://www.webbase-design.de http://openmeetings.googlecode.com http://www.laszlo-forum.de [email protected]
