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| ESQL Infinite Loop - 5000 MQ messages |
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| tank_n_spank |
 Posted: Fri Sep 26, 2014 5:26 am Post subject: ESQL Infinite Loop - 5000 MQ messages |
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Apprentice
Joined: 02 Sep 2014
Posts: 37
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Hello,
So I have DFDL, an ESQL compute node which transforms the data into XML and then sends it to a Queue, however, I hit an infinite loop, can someone tell me what I've done wrong, and how can I optimize it?
| Code: |
SET OutputRoot.DFDL.*:MyDFDLMessage.*:body= InputBody.*:MyDFDLMessage.*:body;
DECLARE refInput REFERENCE TO InputBody.*:MyDFDLMessage.*:body;
DECLARE refElem REFERENCE TO InputBody.*:MyDFDLMessage.*:body;
WHILE LASTMOVE(refElem) DO
SET OutputRoot.XMLNSC.MyDFDLMessage.*:body = refInput;
PROPAGATE TO TERMINAL 'out' ENVIRONMENT OutputLocalEnvironment;
-- MOVE refElem NEXTSIBLING REPEAT NAME;
END WHILE;
RETURN FALSE;
END; |
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| mqjeff |
| Posted: Fri Sep 26, 2014 5:29 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Is that MOVE statement actually commented out in the real code that you actually deploy?
If so, there's your problem. |
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| Vitor |
| Posted: Fri Sep 26, 2014 5:34 am Post subject: Re: ESQL Infinite Loop - 5000 MQ messages |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| tank_n_spank wrote: |
Hello,
So I have DFDL, an ESQL compute node which transforms the data into XML and then sends it to a Queue, however, I hit an infinite loop, can someone tell me what I've done wrong, and how can I optimize it?
| Code: |
SET OutputRoot.DFDL.*:MyDFDLMessage.*:body= InputBody.*:MyDFDLMessage.*:body;
DECLARE refInput REFERENCE TO InputBody.*:MyDFDLMessage.*:body;
DECLARE refElem REFERENCE TO InputBody.*:MyDFDLMessage.*:body;
WHILE LASTMOVE(refElem) DO
SET OutputRoot.XMLNSC.MyDFDLMessage.*:body = refInput;
PROPAGATE TO TERMINAL 'out' ENVIRONMENT OutputLocalEnvironment;
-- MOVE refElem NEXTSIBLING REPEAT NAME;
END WHILE;
RETURN FALSE;
END; |
|
Well, at first glance:
- the MOVE statement is commented out, so LASTMOVE will always test true and you'll loop inifinately
- you're setting the output message from refInput, so even if you were moving refElem you'd get as many output messages containing refInput as there were siblings for refElem to find
- neither refElem nor refInput seem to point to lists so I don't see how you could MOVE down *:body assuming you have multiple *:body elements in the message
Aside from that, it's quite good 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| smdavies99 |
| Posted: Fri Sep 26, 2014 5:59 am Post subject: Re: ESQL Infinite Loop - 5000 MQ messages |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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| tank_n_spank wrote: |
Hello,
| Code: |
SET OutputRoot.DFDL.*:MyDFDLMessage.*:body= InputBody.*:MyDFDLMessage.*:body;
|
and
| Code: |
SET OutputRoot.XMLNSC.MyDFDLMessage.*:body = refInput;
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does your output message tree look right with
OutputRoot.DFDL
and
OutputRoot.XMLNSC
parsers?
do you really need both?
_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995
Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| tank_n_spank |
| Posted: Mon Sep 29, 2014 12:43 am Post subject: Re: ESQL Infinite Loop - 5000 MQ messages |
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Apprentice
Joined: 02 Sep 2014
Posts: 37
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| Vitor wrote: |
| tank_n_spank wrote: |
Hello,
So I have DFDL, an ESQL compute node which transforms the data into XML and then sends it to a Queue, however, I hit an infinite loop, can someone tell me what I've done wrong, and how can I optimize it?
|
Well, at first glance:
- the MOVE statement is commented out, so LASTMOVE will always test true and you'll loop inifinately
- you're setting the output message from refInput, so even if you were moving refElem you'd get as many output messages containing refInput as there were siblings for refElem to find
- neither refElem nor refInput seem to point to lists so I don't see how you could MOVE down *:body assuming you have multiple *:body elements in the message
Aside from that, it's quite good |
| Quote: |
Is that MOVE statement actually commented out in the real code that you actually deploy?
If so, there's your problem. |
Thank you for the help. Commenting MOVE refElem was indeed the problem for the infinite loop. So that fixed it.
| Quote: |
.does your output message tree look right with
OutputRoot.DFDL
and
OutputRoot.XMLNSC
parsers?
do you really need both |
Commenting out OutputRoot.DFDL was indeed not needed. It just passed my message and whatever raw value it first contained.
So after the changes, I got 1 message in the right format. Well, thank you guys for the help!  |
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