[kepler-dev] modeling question about producing f(A, x), f(A, y)...

[Norbert Podhorszki]

Hi Bertram,

A3 should pair a1 with as many tokens on the second stream as many comes 
there. There is no a2 in this problem.

For you Bertram, the specification is the following: we need something 
which could be used practically as an input parameter, but the value is 
determined during the workflow run (and only once). In scripting 
languages, we use variables for this purpose.

Having no good way of using variables in workflows, we have to wire up 
everything to deliver the value from the producer to all consumers (as 
many times they intend to use it).

Of course, you cannot make a Java actor work this way. It would be blocked
on the first input port. But if you look at the PN solution I attached 
earlier, a composite workflow can make as many repetition of the single 
token as many token arrives on the second:

         a1
A1 ---------------> -----  a1,a1,a1
                     | R | ----------|
                 |-> -----           |-> ------  ...f(a1,z),f(a1,y),f(a1,x)
                 |                       | A3 | --------------------------> 
A2 -----------------------------------> ------
       ...,z,y,x


Norbert


On Fri, 3 Aug 2007, Bertram Ludaescher wrote:

> Hi Norbert:
>
> Your graph below seems to be underspecified. How would A3 know how
> many times to pair a1 with x,y,z,... etc?
>
> (see also the questions re. this by Daniel and Carlos).
>
> Can you pls clarify?
>
> cheers
>
> Bertram
>
>