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| MQMD any unchanging fields? |
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| yasaboy |
 Posted: Fri Jan 16, 2015 2:57 am Post subject: MQMD any unchanging fields? |
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Voyager
Joined: 23 Jun 2014
Posts: 90
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Hi,
Is there any unchanging fields in the MQMD like CorrelId or is it possible to make a field unchanged ?
My application receives a delivery report for a specific message. The correlationID set during the put time is received while message is deleted from the queue and the delivery report is generated.
I want some static string like say "TEST", to be added to the message at put time and that to be received in the delivery report. Is this possible and How ? |
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| bruce2359 |
| Posted: Fri Jan 16, 2015 3:01 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9399
Location: US: west coast, almost. Otherwise, enroute.
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Not sure what you mean by 'unchanging.' All mqmd fields are available to the developer.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| yasaboy |
| Posted: Fri Jan 16, 2015 3:07 am Post subject: |
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Voyager
Joined: 23 Jun 2014
Posts: 90
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Suppose I add m_Md.CorrelId = 1234 and m_Md.ReplyToQ= "Q2" in the messages when I add it to a Q1.
Now When I receive the delivery report of Q1 in Q2, it shows m_Md.CorrelId = 1234 , but the m_Md.ReplyToQ comes as NULL. How can I make it static, not changeable.
I have added a Callback to Q2 which is the delivery queue of Q1. |
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| bruce2359 |
| Posted: Fri Jan 16, 2015 3:34 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9399
Location: US: west coast, almost. Otherwise, enroute.
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You want to make some fields in the mqmd read-only? Not supported, as far as I know.
If you want to add to the msg payload, take a look at message properties.
_________________
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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| zpat |
| Posted: Fri Jan 16, 2015 3:42 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5849
Location: UK
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If you want to use MQMD for "user" data, try setting the Appl Identity field.
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Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error. |
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| RogerLacroix |
| Posted: Fri Jan 16, 2015 11:07 am Post subject: |
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Jedi Knight
Joined: 15 May 2001
Posts: 3253
Location: London, ON Canada
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| yasaboy wrote: |
| Now When I receive the delivery report of Q1 in Q2, it shows m_Md.CorrelId = 1234 , but the m_Md.ReplyToQ comes as NULL. |
Working as designed.
| zpat wrote: |
| If you want to use MQMD for "user" data, try setting the Appl Identity field. |
Do as zpat suggests and use ApplIdentityData or use Message Properties as Bruce suggested.
If you use ApplIdentityData then you will need to use the MQOO_SET_IDENTITY_CONTEXT option on the MQOPEN. This means you will need to set the following MD field yourself:
PutApplType
PutApplName
PutDate
PutTime
ApplOriginData
UserIdentifier
AccountingToken
ApplIdentityData
Now if you do your thing with only 4 bytes then I would suggest using ApplOriginData which means you need MQOO_SET_ALL_CONTEXT option for the MQOPEN and you only need to set the following MD fields yourself:
PutApplType
PutApplName
PutDate
PutTime
ApplOriginData
Are you using the entire 24 bytes of the CorrelID? You could use the last 4 or 8 bytes of the CorrelID for your "token".
Regards,
Roger Lacroix
Capitalware Inc.
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