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| Populating usr field of RFH2 header |
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| BBM |
 Posted: Tue Dec 22, 2009 9:00 pm Post subject: Populating usr field of RFH2 header |
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Master
Joined: 10 Nov 2005
Posts: 217
Location: London, UK
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Hi everyone,
Does anyone happen to know the size limits of the usr field of the RFH2 header? I couldn't find this information in the manual.
We are attempting to transport some application metadata with the message but do not want to touch the message body, and I think this field is the best candidate for this purpose.
Many thanks as always,
BBM |
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| fjb_saper |
| Posted: Tue Dec 22, 2009 9:34 pm Post subject: Re: Populating usr field of RFH2 header |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| BBM wrote: |
Hi everyone,
Does anyone happen to know the size limits of the usr field of the RFH2 header? I couldn't find this information in the manual.
We are attempting to transport some application metadata with the message but do not want to touch the message body, and I think this field is the best candidate for this purpose.
Many thanks as always,
BBM |
This is for a good reason. As defined the RFH header is essentially of variable length with an alignment (mod 4). You have to specify the length of the header in one of the first header fields. AFAIK the broker will take care of this for you in the RFH parser...
For practical reasons the header is stored with the payload. So if you are sending the message to a non JMS application you might want to consider an aggregation pattern, in order to keep the RFH "safe". Please also remember that only a select number of CCSIDs are allowed for the information stored in the usr folder. Make sure to check that the one you're planning on using is allowed.
As for the total length, I would expect that it will need to fit the max length of the MQ Message (i.e. MQMD + any linked headers + payload)
Have fun 
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| zonko |
| Posted: Tue Dec 22, 2009 11:02 pm Post subject: |
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Voyager
Joined: 04 Nov 2009
Posts: 78
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The OP did not mention broker...
At WMQv7, the best way to attach additional data to a msg is to use the msg properties API MQSETMP/MQINQMP. I do know that the max size of msg properties is 100Mb. |
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| BBM |
| Posted: Wed Dec 23, 2009 2:32 pm Post subject: |
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Master
Joined: 10 Nov 2005
Posts: 217
Location: London, UK
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Thanks for the replies. We are using MQ 6.02.4 so unfortunately cannot take advantage of the properties field and are only interested in the RFH2 header for it's app data storage capability. i.e. we are not using broker.
Merry Christmas!
BBM |
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