How to provide delay while using flexscript code?

Question

question

Ankur A3 asked Feb 25 2023 at 6:56 AM Jeanette F commented Mar 02 2023 at 5:20 PM

How to provide delay while using flexscript code?

Hi Team,

I would like to know on how to provide delay while executing flexscript code.

For example:

1. Check Machine Availability?

2. Delay 5 mins

Repeat 1 & 2

Can you help me with the flexscript code for delay?

Thank you!

Software Version:

FlexSim 21.1.5

flexscript code delay

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Answer 1 · 2023-02-25T21:11:44Z

Joerg Vogel answered Feb 25 2023 at 9:11 PM Jason Lightfoot commented Feb 27 2023 at 2:00 PM

Discrete event simulation source code expects an immediate result or a new event. Because you want to delay a source code, then you do this by an event that execute the treenode 5 minutes later again. You can use a delayed message, a user event, a process time.
OR you do this in process flow which naturally supports delays of tokens!

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Jason Lightfoot ♦♦ commented · Feb 26 2023 at 12:44 AM

Just a quick note that from version 22.1 you can do this using coroutines where the syntax would be:

await Delay.minutes(5);

...but since the OP is in 21.1 it doesn't apply.

Generally I'd avoid polling and instead detect the availability at the time it becomes available, and (if needed) then wait for the next poll time. This approach fits well with discrete event simulation where you try an model just the events that you need.

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Ankur A3 Jason Lightfoot ♦♦ commented · Feb 27 2023 at 7:50 AM

Hi Jason,

I do agree with the point on tracking the object until it becomes available but how can it be done while using source code in one of the object triggers.

Can you help me with it?

How can we write the condition to track multiple objects until it becomes available?

For eg:

How can we track the status of machine 1 or 2 using source code?

Thank you!

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Ankur A3 Ankur A3 commented · Feb 27 2023 at 7:59 AM

@Jason Lightfoot

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Show more comments

Joerg Vogel commented · Feb 25 2023 at 9:37 PM

You may parse the node by c to execute it delayed again.

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Ankur A3 commented · Feb 27 2023 at 7:58 AM

Hi @Joerg Vogel,

I agree with your point, but I am not able to use this using process flow.

I am using a code under fluid library object where I need to refill the object once its level gets down up to certain limit. Also, I need to first track the availability of other things before start refilling procedure. That's the reason I am thing to delay the code for the time when other equipments become available.

What will you prefer to use for delay in this case?

Thank you!

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1677484583820.png (61.3 KiB)

Joerg Vogel Ankur A3 commented · Feb 27 2023 at 8:27 AM

@Ankur A3, now that you describe a core purpose of your question of delaying a code execution, you can ask a question in a new thread! Delaying an activity until a condition matrix get fulfilled.

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Felix Möhlmann Ankur A3 commented · Feb 27 2023 at 8:27 AM

You can still use Process Flow, by creating a token by code. The relevant methods can be seen for example when selecting to use a SubFlow in a fixed resource's transporter field.

To do everything in code you could

- write the time an equipment will be available again to a label on it, then use one of the methods described by Jason and Jörg to re-run the code at that time (of course only possible if the time when the objects becomes available can be known beforehand, so it might be difficult in a model with constand flow)

- build the logic "in reverse". Have the relevant equipment send a message to the tank whenever it becomes available. The passing mark code would set a label on the tank if the equipment is not available at that time, which then causes it to evaluate the refill code when it next receive a message.

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Joerg Vogel Ankur A3 commented · Feb 27 2023 at 8:33 AM

@Ankur A3, you can call from any source code editor from within source code a process flow by command. But you are not allowed to delay a process flow token advance progress.

You can think of reevaluating this source code trigger by run cycle event controlled in process flow. This flow object trigger checks only all necessary conditions.

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