evoke_slot.mlm

/*
 * You may run this MLM with: $ arden2bytecode -e evoke_slot.mlm
 * 
 * To close the engine press "ctrl+c". 
 */ 

maintenance:
    title: Evoke Slot Example;;
    mlmname: evoke_slot;;
    arden: version 2.5;;
    version: 2.0;;
    institution: Peter L. Reichertz Institut;;
    author: Hannes Flicka;;
    specialist: Hannes Flicka; Mike Klimek;;
    date: 2016-12-07;;
    validation: testing;;

library:
    purpose: Demonstration of the evoke slot;;
    explanation:
        The MLM is triggered immediately, by a constant time trigger. It then 
        calls an event, which triggers the MLM again every few second. Every 
        time it is run, it will write the TRIGGERTIME.
    ;;
    keywords: example, arden syntax editor, arden2bytecode;;
    links: http://arden2bytecode.sf.net/ ;;

knowledge:
    type: data_driven;;

    data:
        LET evt BE EVENT {evt};
    ;;

    evoke:
        1800-01-01; // initial trigger, which lies in the past, runs only once
        EVERY 2 seconds FOR 1 minute STARTING TIME OF evt;
    ;;

    logic: CONCLUDE TRUE ;;

    action:
        IF evt THEN
            WRITE "MLM executed on " || TRIGGERTIME;
        ELSE
            // MLM was not triggered by an event, but by the constant time trigger 
            CALL evt;
        ENDIF;
    ;;
end: