Re: [boost] Re: [Threads] Simple active object wrapper, take 2

From: Mark Blewett (boost_at_[hidden])
Date: 2004-02-28 08:08:23

At 01:02 28/02/2004, you wrote:

>scott <scottw <at> qbik.com> writes:
> > ps:
> > the sample code from mark blewett looks very promising?
> >
>
>Yes.  Although from my point of view, it has the same drawback with switching
>on messages that you have.  I wonder if the queue of messages in the servant
>class could be a queue of fully-bound function calls,

I'm halfway there, in that the queue holds callbacks, eg in 
Servant::dispatch the "do something with m" simply executes the callback.

To give a usage example

class MyServant : public Servant
{
public:
         MyServant(Scheduler* scheduler) : Servant(scheduler) {}
         void do_fn(int x, int y) { std::cout << x << " " << y << std::endl; }
};

int main()
{
         Scheduler scheduler;
         scheduler.start(1,1);

         MyServant my_servant(&scheduler);
         my_servant.post_call(new 
CallbackVAA<MyServant,int,int>(&my_servant, &MyServant::do_fn, 1, 2));

         scheduler.stop();
         return 0;
}

will result in the output "1 2" via one of the schedulers worker threads

>generated by proxy
>objects which describe interfaces?  (Yes, I am quite enamoured of that
>idea :))

Interesting idea... assuming I'm understanding correctly.. in that the 
callback is created by an object in the servant class, the above becomes;

class MyServant : public Servant
{
public:
         MyServant(Scheduler* scheduler) : Servant(scheduler), fn(this, 
&MyServant::do_fn) {}
         MethodProxy<MyServant, int, int> fn;
private:
         void do_fn(int x, int y) { std::cout << x << " " << y << std::endl; }
};

int main()
{
         Scheduler scheduler;
         scheduler.start(1,1);

         MyServant my_servant(&scheduler);
         my_servant.fn(1, 2);    // certainly a lot easier to understand 
than previous example!

         scheduler.stop();
         return 0;
}

Regards
Mark  


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