Listen for a trigger and override the return value with code

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Bo.W asked Apr 13, '21 Jason Lightfoot edited Apr 15, '21

Listen for a trigger and override the return value with code

Is there a method to use Code-monitoring-mechanism to listen for a trigger with a return value (such as sendtoport), and use a value to override the return value of the trigger. The current development environment is not suitable for PF. I know that PF can be realized by using the return value of FINISH activity of subflow.

For example, I want to override the return value of the Queue1's sendtoport trigger with the variable q1s2pCode's execution result in the Plane1.

Listen for a trigger and override the return value with code.fsm

Software Version:

FlexSim 21.0.2

flexsim 21.0.2 event listening override return value

pic2.png (172.5 KiB)

listen-for-a-trigger-and-override-the-return-value.fsm (34.3 KiB)

Answer 1 · 2021-04-14T20:36:44Z

Phil BoBo answered Apr 14, '21 Bo.W edited Apr 15, '21

You can use the listenerinfo() command to override the return value. (This isn't documented anywhere, but it works.)

See the attached example model. listen-for-a-trigger-and-override-the-return-value_autosave_1.fsm

Setting up the listening with eventlisten():

Object queue1 = Model.find("Queue1");
treenode q1send2port = getvarnode( queue1, "sendtoport");
Object Plane1 = Model.find("Plane1");
treenode q1s2pCode = getvarnode( Plane1, "q1s2pCode");
eventlisten(queue1, "SendToPort", q1s2pCode, EVENT_LISTEN|EVENT_PERSIST|EVENT_PASS_THROUGH_PARAMS);

In your listener relayNode, using listenerinfo() to override the return value:

Object item = param(1);
double returnVal = item.Type?;
#define LISTENER_INFO_OVERRIDE_RETURN_VALUE 4
listenerinfo(LISTENER_INFO_OVERRIDE_RETURN_VALUE, up(i), returnVal);

Also, as documented in the eventlisten() command, you can use function_s(obj, "enumerateEvents", node) to list the events that an object has in order to know what string to pass for a certain event and to know what parameters you have access to:

1618432818861.png (60.4 KiB)

listen-for-a-trigger-and-override-the-return-value.fsm (32.7 KiB)

· 1

Bo.W commented · Apr 15, 2021 at 01:41 AM

Thank you very much. This is really helpful to me.Your reply is very accurate and clear.

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