I might be completely wrong, but I think the problem is that web2py locks the session file while executing controller's actions, so two simultaneous requests within the same session are processed one by one sequentially.
On May 24, 8:37 am, eddie <eddie.sh...@gmail.com> wrote: > I have found this recent thread: > > http://groups.google.com/group/web2py/browse_thread/thread/80941011f6... > > But I'm still not entirely sure what the net result is for multiple > controller calls, via ajax or otherwise. > > What exactly does the -n option allow in terms of threading and > handling requests in parallel? > > On May 24, 8:47 pm, eddie <eddie.sh...@gmail.com> wrote: > > > > > Hi guys, > > > I'm looking for some help on allowing controller functions to respond > > to ajax calls from a view in parallel. I've got my head around the > > basic web2py architecture, but this is my first time trying out ajax > > in web2py. > > > Here's the problem. I have a simple view that makes a number of ajax > > calls, to provide delay loading of data. The results are from querying > > and parsing URLs on demand, so they can be slow. The controller > > function I am calling (default/results_data) appears to be blocking, > > only executing one request at a time. This obviously defeats the > > purpose of delay loading the data on the page. > > > I have made sure I am running the web2py app locally with the -n > > option (for threads), but this isn't the issue. I have found the > > session.forget() call, but this isn't it either. > > > I am guessing there is something fundamental that I am doing wrong > > here, I am hoping someone can clarify what is required to allow the > > controller functions that respond to the ajax query to execute in > > parallel, without blocking. > > > A snippet from the html generated by the view: > > > function sendRequest(url,callback,postData) { > > try { > > var req = createXMLHTTPObject(); > > if (!req) return; > > var method = (postData) ? "POST" : "GET"; > > req.open(method,url,true); > > req.setRequestHeader('User-Agent','XMLHTTP/1.0'); > > if (postData) > > > > req.setRequestHeader('Content-Type','application/x-www-form- > > urlencoded'); > > req.onreadystatechange = function () { > > if (req.readyState != 4) return; > > if (req.status != 200 && req.status != 304) { > > alert('HTTP error ' + req.status); > > return; > > } > > callback(req); > > } > > > if (req.readState == 4) return; > > req.send(postData); > > } > > catch (e) { > > throw e;//alert(e); > > }} > > > ... > > <script> > > function source1_results(req) > > {document.getElementById('query1_results').innerHTML = > > req.responseText;} > > sendRequest('/myapp/default/results_data? > > query=foo&source_name=source1', source1_results) > > function souce2_results(req) > > {document.getElementById('source2_results').innerHTML = > > req.responseText;} > > sendRequest('/myapp/default/results_data? > > query=foo&source_name=source2', source2_results) > > </script> > > ... > > <table> > > <tr><td>source1</td><td id="source1_results">Loading...</td><td><a > > href="http://...";>View page</a></td></tr> > > <tr><td>source2</td><td id="source2_results">Loading...</td><td><a > > href="http://...";>View page</a></td></tr> > > </table>
