Most efficient way to execute dynamically defined function

[andy7...@gmail.com]

Hi,

I was playing around with IronJS, trying to allow a Javascript filter function be defined dynamically (as a string in .Net) and be applied to some piece of JSON data (again, coming in as a string in .Net). However, I'm not seeing the performance I would need for what I had in mind - and that may just be the limit of the DLR etc, and that's fine. But before I drop the idea of using a IronJs, I just wanted to be sure I wasn't doing anything silly

I've included my spike code below. On my machine, it executes the function about 400 times a second. Is there a more efficient way to do this?

Thanks in advance

let testIronJs(count) = 

    let testMessage = @"{ 'someData':'blah' }"

    let testPredicate = @"function(data) {

        return data.someData === 'blah';

    }"

    let ctx = IronJS.createContext()

    let sw = new Stopwatch()

    sw.Start()

    // just defining function in global scope for quick test

    let fn = sprintf "testFn=%s;" testPredicate

    ctx |> execute fn |> ignore

    for i in 1..count do

        let script = sprintf "testFn(%s);" testMessage

        let result = ctx |> executeAs<bool> script

        if result <> true then raise(new Exception("Unexpected result"))

        ()

    sw.Stop()

    sw.Elapsed

let main() = 

    let count = 1000

    let timeTaken = testIronJs(count)

    printf "%d in %s\n%f/sec\n" count (timeTaken.ToString()) ((float count/timeTaken.TotalMilliseconds) * 1000.0)

    ()

main()

[Fredrik Holmström]

I would fetch the actual function object testFn and invoke it directly instead of creating a javascript string that calls it every time, as this will cause the parser to get invoked every time which is probably the root of the problem.

Regards,
Fredrik Holmström

http://ironjs.wordpress.com