Re: [Jason-users] Create a timer based on seconds in Cartago

[Jomi H. <jom...@gm...>]

Hi Burak,

I guess that instructions that change the state of the artifact (obs props/signals) have to be executed in a special way in cartago to avoid breaking its atomicity/transactional features. 

if a thread of yours is changing the artifact, the change should be executed inside a block beginExternalSession/endExternalSession. In your code, the thread is created inside this block, but the signal is not running inside such a block. Maybe you can move the begin/end… to inside the “run()” method. 

HTH

Jomi

> On 5 Jun 2022, at 19:18, Burak Karaduman <bbu...@gm...> wrote:
> 
> Dear all,
> 
> I am trying to create a timer that counts based on seconds. However, I am getting this error;
> 
> java.lang.IllegalMonitorStateException
> at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.signalAll(AbstractQueuedSynchronizer.java:1487)
> at cartago.Artifact.commitObsStateChangesAndSignal(Artifact.java:573)
> at cartago.Artifact.signal(Artifact.java:637)
> at example_JaCaMo.MyTimer.access$000(MyTimer.java:11)
> at example_JaCaMo.MyTimer$1.run(MyTimer.java:29)
> at java.base/java.util.TimerThread.mainLoop(Timer.java:556)
> at java.base/java.util.TimerThread.run(Timer.java:506)
> 
> My code is simply like this:
> 
> public class MyTimer extends Artifact {
> 
> void init() {
> defineObsProperty("mytimer", 0);
> timer_creation();
> }
> 
> void timer_creation() {
>   this.beginExternalSession();
> 
> Timer timer = new Timer();
> 
> TimerTask task = new TimerTask(){
>     private int i = 0;
>     public void run(){
>         if (i <= 30) {
>         signal("timerEnd");
>         System.out.println(i);
>         
>         }
>     }
> };
> 
> 
> timer.scheduleAtFixedRate(task, 0, 1000); //1000ms = 1sec
> this.endExternalSession(true);
> }
> }
> 
> How can I tackle this problem?
> 
> Thank you.
> 
> Best regards.
> 
> 
> 
> -- 
> Burak KARADUMAN,
> Ph.D. Student at the University of Antwerp & Flanders Make, 
> Modeling Intelligent Complex Software & Systems (MICSS-Lab), 
> G236, Department of Computer Science, Faculty of Science, Campus Middelheim,
> Middelheimlaan 1, 2020 Antwerp, Belgium
> 
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