Javascript files can be compiled to Java bytecode. Have a look here: https://developer.mozilla.org/en/Rhino_JavaScript_Compiler
HTH, Raphael On Aug 30, 12:35 pm, DVD <[email protected]> wrote: > Thanks. I have many threads come and go instead of a fixed pool so the > overhead is big. > I hope rhino to have a mode that would allow a preloaded/compiled JS > (template) to be executed repeatedly > with different scope (essentially a template engine ) to produce an > output string. > the template would run in only single thread before producing the output. > Equivalent of Freemarker engine. Would it be possible? Or because of > this issue, > Rhino has not been widely used as template engine for Java, compared to > others like > velocity/freemarker. > > Thanks > > David Parks wrote: > > How many worker threads do you have? Context.enter() isn't an expensive > > operation assuming you have the context set up already for each thread. I've > > executed upwards of 10,000 Context.enter/exit() operations a second > > (including executing a small amount of JS and resuming+suspending the JS > > execution) on a single processor (numbers are off the top of my head it was > > a while ago that I profiled it, but in any case it was a large number). If > > it's really a big problem for you (perhaps your threads are being destroyed > > rather than recycled??), you might consider setting up a smaller Work Queue > > (an executor service) of threads that process javascript and submitting > > requests to process javascript to that smaller set of threads. > > > If this is a conceptual concern I suggest profiling the scenario to find out > > what really happens in your situation. > > > Dave > > > -----Original Message----- > > From: > > dev-tech-js-engine-rhino-bounces+davidparks21=yahoo....@lists.mozilla.org > > [mailto:dev-tech-js-engine-rhino-bounces+davidparks21=yahoo....@lists.mozill > > a.org] On Behalf Of DVD > > Sent: Sunday, August 30, 2009 12:51 AM > > To: [email protected] > > Subject: Use Rhino in HTTPServlet, poor performance > > > Hello: > > > I intend to use Rhino in my HTTPServlet methods to execute a javascript > > everytime user request a url. But according to doc, for every method call, > > I have to first use Context.enter()/Scrope/ before eval the same static > > script > > again and again. This is to meet the requirement that Context must be > > created > > for each thread and due to servlet model, this incurs huge overhead for > > performance, > > particularly when many users hits the url at the same time. Is there a way > > to have a precompiled form of the Javascript file created only once and > > used > > for multple thread? The script file itself can be assumed static and no > > need for > > implementing dynamic reload, which would make it easier. > > > Thanks very much > > _______________________________________________ > > dev-tech-js-engine-rhino mailing list > > [email protected] > >https://lists.mozilla.org/listinfo/dev-tech-js-engine-rhino > > > _______________________________________________ > > dev-tech-js-engine-rhino mailing list > > [email protected] > >https://lists.mozilla.org/listinfo/dev-tech-js-engine-rhino > > _______________________________________________ dev-tech-js-engine-rhino mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-js-engine-rhino
