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| Help needed in Mapping node IIB9.0.0.2 |
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| Armageddon123 |
 Posted: Mon Aug 31, 2015 11:07 am Post subject: Help needed in Mapping node IIB9.0.0.2 |
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Acolyte
Joined: 11 Feb 2014
Posts: 61
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Hi All,
I am facing an issue with graphical mapping node.
mapping node has options to add logic to transform the request element using if,else,concact etc functions before calling an ESQL function in mapping node.
But The requirement is- not to output the element when the output value is say 'a' or 'c'. Since I was not able to do the same in mapping logic, we added that logic in a next compute node. But the architect has rejected this code saying that just for few such logics, we should not be using an extra compute node.
Can you please advise what method we have in mapping node, where based on the output , we can perform additional transformation, if any,
I cant really see where it can be done
Thanks. |
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| mqjeff |
| Posted: Mon Aug 31, 2015 11:40 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Don't wire an output from the relevant else blocks.
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chmod -R ugo-wx / |
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| Armageddon123 |
| Posted: Mon Aug 31, 2015 1:56 pm Post subject: |
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Acolyte
Joined: 11 Feb 2014
Posts: 61
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hi mqjeff,
thanks,
but in mapping node, if, else logics are only applicable for the request element. here I would like to appy same if else logic to the response element just before assigning to the output element.
Example:
if($abc=condition)
call esql function
else
call another esql function
Now, this function is having an output which I need to check and act accordinly
if $output='a'
dont wire to output element
else
wire to output element
But we dont have anything like $output avaible in mapping node. since we are not able to apply any logic on the output variable.(variables are only present for the input side), we are not able to proceed with this method |
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| Vitor |
| Posted: Mon Aug 31, 2015 2:57 pm Post subject: Re: Help needed in Mapping node IIB9.0.0.2 |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Armageddon123 wrote: |
But the architect has rejected this code saying that just for few such logics, we should not be using an extra compute node.
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I'd ask the architect what design he feels would allow this to be rolled into the compute node. As he clearly has something in mind, or at least thinks he has, or is just blowing smoke.....
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| martinb |
| Posted: Tue Sep 01, 2015 1:44 am Post subject: |
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Master
Joined: 09 Nov 2006
Posts: 210
Location: UK
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There are a couple of ways the Graphical Mapper can achieve your ESQL function with it's "don't call me if my output will not be what you want" behavior
Option 1
Detect what input value would cause this unwanted output and don't call it in that case
Option 2
- Have your output target element defined as nillable
- Wrapper your existing ESQL function in another ESQL which will flip a unwanted return value into a NULL
Option 3
Actually call this ESQL function as part of your If condition .. and then call it again if the output is acceptable to be passed to the output
If <esql>funcWithPosBadReturn($input) != 'bad'
$ouput = <esql>funcWithPosBadReturn($input)
.. inefficient having to call twice, but a smaller hammer than a follow on compute node to delete the unwanted output after the Mapping node
Note: When you include a Custom ESQL transform, an import is added to refer to the ESQL file, defining a prefix based on the file name. If you need to use custom ESQL only in condition or filter expressions, you can use the "ESQL Imports" properties of the map to add ESQL imports to an ESQL file so that the applicable modules are available through content assist when you are composing an expression. |
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| Armageddon123 |
| Posted: Tue Sep 01, 2015 9:17 am Post subject: |
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Acolyte
Joined: 11 Feb 2014
Posts: 61
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Hi Martinb
Thankyou for the options. hopefully, I will be able to proceed with options 2 or 3.
i will also try to raise an RFE to include this option also in mapping node- "capability to apply logic on the output element before exiting mapping node".
Thanks |
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