Jason wrote:
> It looks like you're using the trick of asking Sage to evaluate some
> text using cell id -1. This is a hack right now, as cell ids are
> supposed to be nonnegative numbers. Currently, though, the output
> directories are created and the right .py file is created and sent to
> SAGE. Problems can crop up if you happen to have two requests going to
> Sage simultaneously (one request overwrites the other since they're both
> for cell -1). Also, Sage complains that cell -1 wasn't defined before
> sending the text to it. I think there may be other places in the code
> where the id is assumed to be nonnegative.
This is where I need to get my mind around the notebook code better.
What I am doing now is the following:
1) When the applet launches, it injects an applet_callback function
into the browser:
win = JSObject.getWindow(this);
win.eval("function applet_callback(status, response_text) {" +
"document.mathrider.response( status, response_text );"+
"}"
);
2) When the user enters code into the Send text area, the applet calls
the async_request function and gives the applet_callback function as
the callback (I have been experimenting with different values for
newcell and id to see what effect they have):
String code = sendTextArea.getText();
String encodedCode = URLEncoder.encode(code,"UTF8");
win.eval("async_request(worksheet_command('eval'),
applet_callback,
'newcell=1&id=11&input="+ encodedCode +"');");
3) The response method in the applet is called by the applet_callback
function to handle the response:
public void response( String status, String response_text )
{
receiveTextArea.append("\nStatus: " + status + " Response: " +
response_text + "\n");
}//end method.
Eventually, I see different parts of the applet communicating with the
server concurrently. To enable multiple concurrent submissions to the
server, I was thinking about maybe having response objects in the
applet handle the replies.
In light of this approach, I am going to have to study your
enhancement proposals further to better understand how they would
work.
Ted
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