LAE

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Originally posted by: PThai

Hi All

Does anyone know how to enable or disable an output node (eg CSV Output) depending on whether there is input or not to the output node. Ie I don't want to produce an output file if there is zero records to output.

Thanks

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Originally posted by: Tim Meagher

Hi,

If you just want to ensure that the CSV Output node doesn't run when there are no records input, then you should try using the MetaCheck node - found in the "Metadata and Structure" category in the node palette.

For instance, you could provide the input to both the MetaCheck node and the CSV Output node and also create a link between the out-clock on the MetaCheck node and the in-clock on the CSV Output node.
Then, within the MetaCheck node, simply set the TerminusAction to "NeitherOutputNorClock" and the SuccessAction to "BothOutputAndClock" and the MinimumRecordCount to 1.

Hope this helps,
Tim.

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Originally posted by: xathras

Hi Tim,

Does Meta check still exist in 4.5.x versions and in the same way?

Regards
Wayne

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Originally posted by: Tim Meagher

Hey,

The MetaCheck node exists in LAE 4.1.x and LAE 4.5.x, however, the node has changed slightly between 4.1.x and 4.5.x.
From the LAE (4.5.0) release notes:

			
				The MetaCheck node has been changed to improve performance and add extra functionality. The node no longer has an output by default. If no output is present, and there are no checks involving number of records, then the node will complete much quicker than it currently does.



The parameter "TerminusAction" replaces the parameter "TerminusType", with the same options and defaults. Existing nodes using the "TerminusType" will still function correctly, as this parameter has simply been hidden, and if this parameter is set, and TerminusAction is not set, then TerminusType is used.



The parameter "SuccessAction" has been added. This has the same options as TerminusType/TerminusAction, but describes what to do in the case that all of the tests pass.

Note that with the removal of the default output, existing MetaCheck nodes that used this output will need to be rewired. However, in most cases (depending on the current setting of TerminusType) it would be recommended to simply connect the inclock of these nodes to the outclock of MetaCheck, and connect their input to the same source as the input to the MetaCheck node.
			

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Originally posted by: PThai

Hi Tim

I used the Meta Check and it works ie CSV output does not run. However, because the CSV output node is part of a composite which is clocked to another composite, the unexecuted CSV output prevents the clocked composite from running. Is there a way to disable the CSV output instead just leaving it in an unexecuted state or is there another way around this?

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Originally posted by: mermacora

Hi Pamela

Try setting the TerminusAction in the MetaCheck node to "ClockWithPropagate".
This should allow nodes clocked to your composite to run even when there are zero records.

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Originally posted by: Leaner

Originally posted by: Tim Meagher
					

Hi,


If you just want to ensure that the CSV Output node doesn't run when there are no records input, then you should try using the MetaCheck node - found in the "Metadata and Structure" category in the node palette.


For instance, you could provide the input to both the MetaCheck node and the CSV Output node and also create a link between the out-clock on the MetaCheck node and the in-clock on the CSV Output node.

Then, within the MetaCheck node, simply set the TerminusAction to "NeitherOutputNorClock" and the SuccessAction to "BothOutputAndClock" and the MinimumRecordCount to 1.


Hope this helps,

Tim.
			

Super helpful, thanks!