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Propagate Question

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Chuck831

Posted: Fri Mar 25, 2005 11:46 am Post subject: Propagate Question

Apprentice

Joined: 23 Dec 2002
Posts: 28

Hi,

Could someone point me in the right direction. My message flow is as follows:

Filter --->Compute(1) ---> FlowOrder ---> Compute(2) ---> Output
| ---> Compute(3) ---> Output

Even though I have a RETURN FALSE in the Compute(1) node it still propagates when the ESQL terminates. If I have 2 job numbers in the environment I would expect to see 2 messages on each of the output queues. However, this ESQL is producing 3 messages on each of the output queues. (The FlowOrder is used to create 2 different message types on 2 different queues).

Here is the code for Compute(1):

Code:

CREATE COMPUTE MODULE CEM2_PropagateMessages
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN

   Declare RecCnt Integer;

   Set RecCnt = 0;

   While RecCnt <= Cardinality(Environment.Variables.Result[]) Do

         Set RecCnt = RecCnt + 1;
         Set OutputRoot = InputRoot;
      Set OutputRoot.XML.ChangeJob.DataArea.JobNumber = Environment.Variables.Result[RecCnt].JOB_NO;

      PROPAGATE;

   End While;

   RETURN FALSE;

END;

END MODULE;

Thanks.

Chuck831

Posted: Fri Mar 25, 2005 1:13 pm Post subject:

Apprentice

Joined: 23 Dec 2002
Posts: 28

I just worked this one out.

It was in the way that I was incrementing RecCnt. If you move

Code:

SET RecCnt = RecCnt + 1;

to after the PROPAGATE statement everything works correctly.

jefflowrey

Posted: Fri Mar 25, 2005 1:27 pm Post subject:

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981

It did look like an off-by-one error.
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I am *not* the model of the modern major general.

Ramphart

Posted: Mon Mar 28, 2005 11:15 pm Post subject:

Disciple

Joined: 21 Jul 2004
Posts: 150
Location: South Africa, JHB

In general when you work with cardinality your RecCnt should really start from 1 and not 0 outside your loop. You dont want to enter the loop if cardinality = 0. Thats about it.
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