Adding large amounts of data to multiple traces

Question

Hi,
I have a CNiGraph object. I want to add a 100 traces (plots) with each 500.000pts, and later update with 50.000pts/sec for each trace. How can I do this? I tried and got a result of 45 seconds for 300pts/trace for 100 traces. I must be missing something. What is the fastest way to add the points to the traces? For the init I would use PlotXvsY (as ALL traces can have different X values and the length of each trace may not be the same). Then ChartXvsY. I don't even get as far as the ChartXvsY, since the first stage takes forever. Probably one reason is that I am getting a screen update for every trace added (can this be disabled?). I also don't want the graph to rescale on every trace update, just move it to the end (scroll). I tried turning of the AutoScale function for the plots and setting their visibility to false, but that still took like 23secs (for 100 traces, 300p/t).
Please help.
Thanks,
Miklos

Answer 1

Instead of using URLConnection open a Socket to the server port (80 probably) send a POST http request followed by the data, you may then (optional) recieve data from the server to check that the servlet is ok, this is the same protocol as URLConnection, but you have control over when the data is actually sent...
Socket sock=new Socket(getHost(),80);
DataOutputStream dos=new DataOutputStream(sock.getOutputStream());
dos.writeBytes("POST servletname\r\n");
dos.writeBytes("Content-type: text/plain\r\n");  //optional, but good if you know
dos.writeBytes("Content-length: "+lengthOfData+"\r\n")  //again, optional, but good if you can know it without caching the data first
dos.writeBytes("\r\n");   // gotta have a blank line before the data
  // send data now
DataInputStream=new DataInputStream(sock.getInputStream());  //optional if you want to recieve
  // recieve any feedback from servlet if you want
dis.close();
dos.close();
sock.close();im guessing that URLConnection caches the data so it can fill in "Content-length"