Is it possible to check existence of data in data flow?

avackova

• March 08, 2010 00:00

• Answered

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Is it possible to check the non-existence of data? For example, I might want to raise an error if no data is received in a flow.

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  avackova

  • March 08, 2010 08:49

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  You can check number of processed records in all components with transformation, you write by yourself - in finished() method. If your counter is still on initial
  value you can just raise an error (raise_error function in ctl), eg. put a Reformat between other components:
  

  //#TL
  int counter = 0;
  // Transforms input record into output record.
  function transform() {
  	counter++;
  	$0.* := $0.*;
  }
  
  // Called after the component finishes.
  function finished() {
  	if (counter == 0) raise_error("Input flow is empty");
  }

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