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Sequence noset vs QAction

Solved582 views20th April 2023Sequence noset
2
Greisen Gustiantoro [DevOps Member]420 19th April 2023 0 Comments

Hi Dojo,

When doing simple math for a parameter, is it a good practice just to use the below syntax?

<Interprete>
<RawType>numeric text</RawType>
<Type>double</Type>
<LengthType>next param</LengthType>
<Sequence noset="true">factor:[id:150];div:1000</Sequence> 
</Interprete>

Or QAction is a better way to go?

Regards,

Greisen Gustiantoro [DevOps Member] Selected answer as best 20th April 2023

1 Answer

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Laurens Moutton [SLC] [DevOps Enabler]8.70K Posted 19th April 2023 1 Comment

Hi,

If the raw parameter value is directly coming in through polling (snmp, serial) and the value can be adapted with a Sequence then it is best practice to use that.

The benefits compared to using a QAction in this case are:

  • Only 1 parameter is needed, vs 2 (one that would be containing the raw polled value and one that would be containing the calculated value).
  • Faster processing, everything stays in SLProtocol. Else a QAction needs to be started in SLScripting, it needs to perform an inter-processes call between SLScripting and SLProtocol to get the value and another call to set the value. At first startup the QAction dll also needs to be compiled.
  • Less developer work: not needing to create the 2nd parameter, not needing to write the QAction.

The benefits of using a QAction is that more complex calculations can be done and it is easier to debug if needed, but if the calculation is simple and can be done with a Sequence then I would go for the Sequence possibility.

Greisen Gustiantoro [DevOps Member] Selected answer as best 20th April 2023
Greisen Gustiantoro [DevOps Member] commented 19th April 2023

Hi Laurens,

Thank you for the insights.

Regards,

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