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| bobbee |
 Posted: Wed Apr 03, 2019 6:59 am Post subject: Request/Repy using Pub/Sub |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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The client has implemented this using typical queuing. At the gateway they changed to a QAlias to a topic and have set a SUBSCTIPTION to deliver this to the RESPONSE queue. When switching to the QAlias-Topic distribution the message being passed is loosing the CorrelationID passed in the message and a new one is being generated. Is there a way to do this?
They have tried wiping out the auto-generated CorrellId in the Subscription and have set the report option of Pass-Correlid when writing the reply to the queue/topic.
Topology:
Request App<==>IIB<==>Gateway<==>Reply App |
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| hughson |
| Posted: Wed Apr 03, 2019 1:33 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1967
Location: Bay of Plenty, New Zealand
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| bobbee |
| Posted: Thu Apr 04, 2019 4:20 am Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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| bobbee |
| Posted: Thu Apr 04, 2019 4:39 am Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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I believe they are using the DEF Sub command. So I am believing this is what they need.
| Code: |
DESTCORL( string )
The CorrelId used for messages published to this subscription.
A blank value (default) results in a system generated correlation identifier being used.
If set to ' 000000000000000000000000000000000000000000000000 ' (48 zeros) the CorrelId set by the publishing application will be maintained in the copy of the message delivered to the subscription, unless messages are propagated across a publish/subscribe hierarchy.
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| fjb_saper |
| Posted: Thu Apr 04, 2019 12:29 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY
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| bobbee wrote: |
I believe they are using the DEF Sub command. So I am believing this is what they need.
| Code: |
DESTCORL( string )
The CorrelId used for messages published to this subscription.
A blank value (default) results in a system generated correlation identifier being used.
If set to ' 000000000000000000000000000000000000000000000000 ' (48 zeros) the CorrelId set by the publishing application will be maintained in the copy of the message delivered to the subscription, unless messages are propagated across a publish/subscribe hierarchy.
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However note the caveat of the pub/sub hierarchy where passing MQCI_NONE doesn't have the expected effect!!! 
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MQ & Broker admin |
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| bobbee |
| Posted: Thu Apr 04, 2019 12:33 pm Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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I did the following and sent a message through and the Correlation ID arrived as sent. I am having my customer test it now.
| Code: |
DEFINE QL(BOBBEEOUT)
DEFINE TOPIC('mtopic.TOPIC') TOPICSTR('mtopic') REPLACE
DEFINE QALIAS('MY_ALIAS') TARGET('mtopic.TOPIC') TARGTYPE(TOPIC) REPLACE
DEFINE SUBsub(CORRELID) topicstr('mtopic') destcorl('000000000000000000000000000000000000000000000000') DEST(BOBBEEOUT)
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| hughson |
| Posted: Thu Apr 04, 2019 11:45 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1967
Location: Bay of Plenty, New Zealand
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If you'd read the link I supplied in the first answer, you would have seen that you don't have to provide all 48 zeros.
DESTCORL(0) will suffice.
Cheers,
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
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| bobbee |
| Posted: Fri Apr 05, 2019 2:17 am Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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I would never argue with the Queen of MQ.
I was on a screen share and I had her take the current SUB and alter it and put zeros in there. That had no effect. When I saw this I said 'Been there done that" but I did it anyway. Maybe there is a difference in what I did then and this. But I will amend my command. But Hey, what's 47 zeros between friends!!! Unless it iwas on my pay check!! Thanks for your help. It was very useful.................as always!! |
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| bruce2359 |
| Posted: Fri Apr 05, 2019 4:03 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9486
Location: US: west coast, almost. Otherwise, enroute.
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47?
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| bobbee |
| Posted: Fri Apr 05, 2019 4:21 am Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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destcorl('000000000000000000000000000000000000000000000000')
minus
destcorl('0')
equals
destcorl('00000000000000000000000000000000000000000000000') |
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| bruce2359 |
| Posted: Fri Apr 05, 2019 4:32 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9486
Location: US: west coast, almost. Otherwise, enroute.
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Hmmmm... I would've thought 24 bytes of hex/bin zeroes would be 48 zeroes.
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| bobbee |
| Posted: Fri Apr 05, 2019 4:47 am Post subject: |
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Knight
Joined: 20 Sep 2001
Posts: 546
Location: Tampa
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me 2.
BTW, The customer just responded that they implemented this on their system and it worked. On to the next issue!! |
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| hughson |
| Posted: Fri Apr 05, 2019 1:27 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1967
Location: Bay of Plenty, New Zealand
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He was using 48 zeros, I said you only need 1. Thus 47 zeros are spare/redundant etc => "what's 47 zeros between friends".
| bruce2359 wrote: |
| Hmmmm... I would've thought 24 bytes of hex/bin zeroes would be 48 zeroes. |
It is, but you can simply use a single zero in MQSC keyword as a shorthand for the same.
| bobbee wrote: |
| The customer just responded that they implemented this on their system and it worked. On to the next issue!! |
Great news!
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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