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datspats
PostPosted: Mon Nov 12, 2007 5:26 am    Post subject: confusion in correlId Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
I am setting as CorrelId as some value.
DECLARE number DECIMAL;
SET number = 102;

Set OutputRoot.MQMD.CorrelId = operation_to_get_24Byte(number);

The output of the MQGEt is

****Message descriptor****

StrucId : 'MD ' Version : 2
Report : 0 MsgType : 8
Expiry : -1 Feedback : 0
Encoding : 273 CodedCharSetId : 819
Format : 'MQXMIT '
Priority : 0 Persistence : 1
MsgId : X'414D5120424D5553454D3320202020204714A35B208B4902'
CorrelId : X'414D5120424D5553454D3320202020204714A35B208AA02F'
BackoutCount : 0
ReplyToQ : ' '
ReplyToQMgr : 'ABC '
** Identity Context
UserIdentifier : 'XYZ '
AccountingToken :
X'0532383534320000000000000000000000000000000000000000000000000006'
ApplIdentityData : ' '
** Origin Context
PutApplType : '7'
PutApplName : 'ABC '
PutDate : '20071108' PutTime : '15544486'
ApplOriginData : ' '

GroupId : X'000000000000000000000000000000000000000000000000'
MsgSeqNumber : '1'
Offset : '0'
MsgFlags : '0'
OriginalLength : '-1'

**** Message ****

length - 16161 bytes

/* some initial entries */

00000050: 2020 2020 2020 2020 2020 2020 2020 2020 ' '
00000060: 2020 2020 2020 2020 4D44 2020 0000 0001 ' MD ....'
00000070: 0000 0000 0000 0008 FFFF FFFF 0000 0000 '................'
00000080: 0000 0111 0000 0333 4D51 4852 4632 2020 '.......3MQHRF2 '
00000090: 0000 0000 0000 0001 414D 5120 424D 5553 '........AMQ XXXX'
000000A0: 454D 3320 2020 2020 4714 A35B 208A A02F 'XX3 G..[ ../'
000000B0: 0000 0000 0000 0000 0000 0000 0000 0000 '................'
000000C0: 0000 0000 0000 0066 0000 0000 2020 2020 '.......f.... '
000000D0: 2020 2020 2020 2020 2020 2020 2020 2020 ' '
000000E0: 2020 2020 2020 2020 2020 2020 2020 2020 ' '

/* some last entries...........*/

I have confusion how the Correld Id is different as i can see in the message dump on line
000000B0 and 000000C0 as my correldId properly set HEX(102) = 66, but the Message header shows
CorrelId : X'414D5120424D5553454D3320202020204714A35B208AA02F' which is also presents on line 00000090 and
000000A0.

Please help if my concepts are not clear!

Regards
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Vitor
PostPosted: Mon Nov 12, 2007 5:33 am    Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
There are any number of posts in the forum about why setting message or correl id is a bad idea.

Is an MQOutput node set to generate a new Correl Id? Or the MQMD being copied from another source?
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jefflowrey
PostPosted: Mon Nov 12, 2007 5:33 am    Post subject: Reply with quote

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981
Please don't use correlationId to hold business level data.

What options did you specify on Message Context?

Did you set OutputRoot.Properties.ReplyIdentifier=NULL?
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datspats
PostPosted: Mon Nov 12, 2007 6:08 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
Quote:
What options did you specify on Message Context?

Did you set OutputRoot.Properties.ReplyIdentifier=NULL?


hi jeff,

I have not done the above operations, But I would like to know what has caused the above on correld? what has gone wrong with my interpretation
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jefflowrey
PostPosted: Mon Nov 12, 2007 6:31 am    Post subject: Reply with quote

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981
Message Context:
http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/index.jsp?topic=/com.ibm.etools.mft.doc/ac04570_.htm

Properties.ReplyIdentifier
if you have updated a field in both the properties folder and the header with different values, the value that you set in the header is overwritten by the value that you set in the properties folder.
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datspats
PostPosted: Mon Nov 12, 2007 8:20 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
Hi jeff,

Thanks, but
what does
Quote:
000000B0: 0000 0000 0000 0000 0000 0000 0000 0000 '................'
000000C0: 0000 0000 0000 0066
this value means shown in the MQ message dump

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jefflowrey
PostPosted: Mon Nov 12, 2007 8:21 am    Post subject: Reply with quote

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981
I don't know what it means.

What did you specify in the message body?
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datspats
PostPosted: Mon Nov 12, 2007 8:34 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
Hi jeff
this is certainly not the part of the Message body, it is part of header
Please check for line 000000B0 and 000000C0 in my first message


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jefflowrey
PostPosted: Mon Nov 12, 2007 8:48 am    Post subject: Reply with quote

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981
That looks like it's in the area of the output from amqsbcg that shows the contents of the message body.
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datspats
PostPosted: Mon Nov 12, 2007 9:01 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
No it is very sure that it is not message body as there are several line follows after this which it has the MQMD header field also MQRFH2 header field as well. I have taken out that portion only.

I am setting correlId as 00......0066 (24 byte array). That is the confusion as message tree shows some value in correlId where message dump from amqsbcg has what the value I expect as correld Id

Again
Message tree from amqsbcg
Quote:
MsgId : X'414D5120424D5553454D3320202020204714A35B208B4902'
CorrelId : X'414D5120424D5553454D3320202020204714A35B208AA02F'


and message dump (plz check from line 00000090 onwards)

00000060: 2020 2020 2020 2020 4D44 2020 0000 0001 ' MD ....'
00000070: 0000 0000 0000 0008 FFFF FFFF 0000 0000 '................'
00000080: 0000 0111 0000 0333 4D51 4852 4632 2020 '.......3MQHRF2 '
00000090: 0000 0000 0000 0001 414D 5120 424D 5553 '........AMQ BMUS'
000000A0: 454D 3320 2020 2020 4714 A35B 208A A02F 'EM3 G..[ ../'
000000B0: 0000 0000 0000 0000 0000 0000 0000 0000 '................'
000000C0: 0000 0000 0000 0066 0000 0000 2020 2020 '.......f.... '
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bower5932
PostPosted: Mon Nov 12, 2007 9:07 am    Post subject: Reply with quote

Jedi Knight

Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
Are you sure that your 'MD' at line 060 isn't a chained header? If you'll run amqsbcg with a message that you used amqsput to put, you'll see that the message body is what is at line 060.
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bower5932
PostPosted: Mon Nov 12, 2007 9:09 am    Post subject: Re: confusion in correlId Reply with quote

Jedi Knight

Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
I should have looked at your initial append a little closer:
datspats wrote:

Format : 'MQXMIT '


It appears that you are browsing the transmit queue?
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datspats
PostPosted: Mon Nov 12, 2007 9:13 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
ok. but the concern was how I can see both correld value as per message tree and the value I assign manually in the message dump.
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EddieA
PostPosted: Mon Nov 12, 2007 9:40 am    Post subject: Reply with quote

Jedi

Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
102 decimal = x'66'

And if you need to see the layout of an MQMD, then try looking in the manual where IBM took great pains to document this for you.

Cheers.
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datspats
PostPosted: Mon Nov 12, 2007 10:10 am    Post subject: Reply with quote

Voyager

Joined: 12 Apr 2007
Posts: 80
Location: Mumbai
Hi eddieA
Please correct me, from google i got as message layout in the byte order

first byte[24] - original msg correlid (msg correlationid
provided by the sending application)
second byte[24] - message correlid (generated correlationid for
the msg)

so from my message dump

00000090: 0000 0000 0000 0001 414D 5120 424D 5553 '........AMQ BMUS'
000000A0: 454D 3320 2020 2020 4714 A35B 208A A02F 'EM3 G..[ ../'
000000B0: 0000 0000 0000 0000 0000 0000 0000 0000 '................'
000000C0: 0000 0000 0000 0066


original msg correlid : 414D 5120 424D 5553 454D 3320 2020 2020 4714 A35B 208A A02F
message correlid : 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0066

So if receiving appln read the correld from the message Will it read as (InputRoot.MQMD.correlID) = 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0066 ?

Please reply

Regards
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