On Fri, Jun 29, 2012 at 12:49 PM, hd nguyen <[email protected]> wrote:
> Hi all,
>
> I'm new here and want to make a simple test web app with NodeJS and Express
> framework.
>
> I created 2 request are http://localhost:3000/heavycompute (very long time
> processing) and http://localhost:3000/ (just display text, return
> immediately) and handling methods for them as below code:
>
> module.exports = function(app) {
> //for http://localhost:3000/
> app.get('/', function(req, res){
> res.render('index', { title: 'Express', html: 'html param' });
> } );
>
>
> //for http://localhost:3000/heavycompute
> app.get('/heavycompute', function(req, res) {
> var sum = 0;
> for(var i = 0; i < 99998888777; i++) {
> sum += i;
> }
> res.render('index', { title: 'Express', html: sum });
> } );
> };
>
> The problem here is when I open simultaneously 2 tabs, each method on a tab,
> enter http://localhost:3000/heavycompute FIRST, then
> hit http://localhost:3000/,
>
> I expect http://localhost:3000/ return right away, but seem it must wait for
> completion of http://localhost:3000/heavycompute request handler.
>
> Could you help me pointing out what I have done wrong here with my code? I'm
> new and not sure I handle event-driven mechanism in coding properly, I want
> each handler should process each request separately as normal threaded web
> app server (tomcat, IIS,...).
>
> Appreciate any explanation/help.
>
> Thanks in advance.
Don't do long computations inside your main application. Spin up a
child process with require('child_process').fork() and do it there.
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