Re: [groovy-user] creating a new method inside invokeMethod

You shouldn't have to synchronize, Groovy uses concurrent
implementations of collections under the surface.

If you do get ConcurrentModificationExceptions it should be regarded
as a bug, but since we use this technique for GORM in Grails if this
were a problem we would know about it by now

Cheers

On Thu, Jul 17, 2008 at 2:38 PM, Rubee <charlestassoni@...> wrote:
>
> I've seen examples where invokeMethod creates a new method so that, on the
> next call, the performance hit is reduced. Here's an example from Venkat
> Subramaniam's excellent "Programming Groovy." (See p. 223.)
>
> class Manager
> {
> .......
> def methodMissing(String name, args)
>  {
>    println "intercepting call to $name..."
>    def delegateTo = null
>
>    if(name.startsWith('simple')) { delegateTo = worker }
>    if(name.startsWith('advanced')) { delegateTo = expert }
>
>    if (delegateTo?.metaClass.respondsTo(delegateTo, name, args))
>    {
>      Manager.metaClass."${name}" = { Object[] varArgs ->
>            return delegateTo.invokeMethod(name, *varArgs)
>      }
>
>      return delegateTo.invokeMethod(name, args)
>    }
>
>    throw new MissingMethodException(name, Manager.class, args)
>  }
> ........
> } //end class
>
> I need to do this is an webapp, which means my analog to the Manager class
> shown here lives in a multi-threaded enviroment.
>
> My question, then, is how do I handle method-creation in a mulit-threaded
> environment?  I suppose that question boils down to: what do I need to
> synchronize on, if anything?
>
> I hope developers are doing this kind of thing all the time, and maybe
> someone can show me a real-world example.
>
>
>
> --
> View this message in context: http://www.nabble.com/creating-a-new-method-inside-invokeMethod-tp18508436p18508436.html
> Sent from the groovy - user mailing list archive at Nabble.com.
>
>
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--

-- 
Graeme Rocher
Grails Project Lead
G2One, Inc. Chief Technology Officer
http://www.g2one.com

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