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Message
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| Sam Uppu |
 Posted: Sat Aug 20, 2011 3:27 pm Post subject: correlation id issue |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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Hi guys,
Based upon our requirement, I have to pass the correlation id of input message in payload. I have casted the correlationid field to char and assiged it to xml_correlid element of xml request and dropped to frontend application queue.
The frontend application processes the message and will build xml response with the xml_correlid element same as what is there in request.
When the response arrives on the response flow of message broker, I casted the xml_correlid to BLOB and assigned it to OutputRoot.MQMD.CorrelID.
When I saw the correlation ID in MQMD, i see it is not similar to the original one. The number of characters is also not same.
I defined the xml_correlid element as string.
Can you guy spls help on how to save the correlation id in request message and use it in response flow. |
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| Vitor |
| Posted: Sat Aug 20, 2011 4:26 pm Post subject: Re: correlation id issue |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Sam Uppu wrote: |
| I have casted the correlationid field to char |
It's not a character field. It's a byte array.
| Sam Uppu wrote: |
| I defined the xml_correlid element as string. |
It's not a string either.
| Sam Uppu wrote: |
| Can you guy spls help on how to save the correlation id in request message and use it in response flow. |
Store it as is in the XML (base64?)
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| Sam Uppu |
| Posted: Sat Aug 20, 2011 6:26 pm Post subject: Re: correlation id issue |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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| Vitor wrote: |
Store it as is in the XML (base64?) |
So, I need to store the correlationId as is in XML and later in response flow, I can just retrieve and assign to OutputRoot.MQMD.CorrelId.
I tried this yesterday and got some error saying MQMD cannot be char.
Also what should be the datatype for xml element used? |
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| smdavies99 |
| Posted: Sat Aug 20, 2011 9:46 pm Post subject: |
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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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As Vitor has said, the CorrelId (and MsgId and GroupId) are NOT human readable fields. They may look it but they are not.
If you doubt this, take a look at the way they are defined in the WMQ header file cmqc.h
So the question remains as to how you can include them in an XML structure in a form that you can use later in an MQMD.
Encode it as Base64 (in ESQL in V7.0.0.2) and then tag the XML field type as Base64Binary in your XSD.
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| Sam Uppu |
| Posted: Sun Aug 21, 2011 4:36 pm Post subject: |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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| smdavies99 wrote: |
Encode it as Base64 (in ESQL in V7.0.0.2) and then tag the XML field type as Base64Binary in your XSD. |
Vitor/samdavies99,
Thank you. Will try the option suggested. |
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| lancelotlinc |
| Posted: Mon Aug 22, 2011 5:40 am Post subject: |
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Jedi Knight
Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA
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Sam -- look in source code from June 2010. You will find example of representing the CorrelId as a string.
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| Sam Uppu |
| Posted: Mon Aug 22, 2011 7:32 am Post subject: |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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I am not with the same client.
Last edited by Sam Uppu on Mon Aug 22, 2011 7:39 am; edited 1 time in total |
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| Sam Uppu |
| Posted: Mon Aug 22, 2011 7:34 am Post subject: |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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| lancelotlinc wrote: |
| Sam -- look in source code from June 2010. You will find example of representing the CorrelId as a string. |
Hey,
I am not with the same client.
Thanks |
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| lancelotlinc |
| Posted: Mon Aug 22, 2011 8:01 am Post subject: |
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Jedi Knight
Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA
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| Code: |
String refCorrelId = new String();
for( int i = 0; i < 24; i++ ){
String iHexStr = Integer.toHexString( msg.correlationId[i] );
if ( iHexStr.length()>2 ) iHexStr = iHexStr.substring( iHexStr.length()-2 );
if ( iHexStr.length()<2 ) refCorrelId = refCorrelId + "0";
refCorrelId = refCorrelId + iHexStr;
} |
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| mqjeff |
| Posted: Mon Aug 22, 2011 8:05 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| lancelotlinc wrote: |
| Code: |
String refCorrelId = new String();
for( int i = 0; i < 24; i++ ){
String iHexStr = Integer.toHexString( msg.correlationId[i] );
if ( iHexStr.length()>2 ) iHexStr = iHexStr.substring( iHexStr.length()-2 );
if ( iHexStr.length()<2 ) refCorrelId = refCorrelId + "0";
refCorrelId = refCorrelId + iHexStr;
} |
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of course, in ESQL, this is just CAST(InputRoot.MQMD.CorrelId AS STRING).
And then a bit of substringing to remove the X' and ' that wrap it. |
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| lancelotlinc |
| Posted: Mon Aug 22, 2011 11:58 am Post subject: |
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Jedi Knight
Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA
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Definately the ESQL use case is much more efficient from a programmatic perspective, unless you want to use log4j to record the CorrelId.
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| Vitor |
| Posted: Mon Aug 22, 2011 12:02 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| lancelotlinc wrote: |
| unless you want to use log4j to record the CorrelId. |
Which the OP has given no indication of, intending it seems to use it to correlate a response.
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Insanity is the best defence. |
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| Sam Uppu |
| Posted: Mon Aug 22, 2011 7:03 pm Post subject: |
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Yatiri
Joined: 11 Nov 2008
Posts: 610
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Hi All,
Thanks for all your suggestions.
I used base64 encoding as suggested and it worked.
Thanks
Sam |
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