Forking and Joining in Activity Graphs

[Christoph Müller]

I've got a question regarding the possibility to fork and join activities in LQN activity graphs.

The xsd schema linked here as well as the the thesis by Xiuping Wu (p. 41) mentions a "pre-AND" Element for this task.

Example:

    <precedence>
      <pre-AND>
        <activity name="main_call"/>
        <activity name="db_call"/>
      </pre-AND>
    </precedence>

While looking through the code of LINE I could only find code parsing the pre/post-OR element, but no occurence of pre/post-AND or pre/post-LOOP.

Is support for these elements planned or is there another way to achieve forking/joining?

Best regards,

Christoph

[Juan]

Hi Christoph,

Thanks for your interest in LINE.
Currently, LINE supports OR precedences, but no AND nor LOOP. We are working on adding support for the AND precedence to consider fork-join constructs. This is still work in progress so we don't have a planned release date yet.

Best wishes,
Juan

[Christoph Müller]

Hi Juan,

thanks for considering to add Fork/Join mechanisms to LINE. In the meantime I tried to work on an alternative (basically an approximation) using async calls.

While LINE does not throw an error, I just get 0% Utilization on processors that have been called using async calls. I couldn't find any examples using <async-call>, is there a minimal working example available somewhere? Is there something I am missing (like an necessary reply for instance)?

Best regards,
Christoph

[Juan]

Hi Christoph,

I will look into the problem you mention and get back to you as soon as possible.

Best wishes,
Juan