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| happyj |
 Posted: Wed Mar 01, 2006 4:45 am Post subject: esql checksum |
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Voyager
Joined: 07 Feb 2005
Posts: 87
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Has anyone implemented a checksum generator with esql ?
Any particular algorithm ?
I would like to store this along with an id in a database lookup
and change the processing if I get an identical data message for
the same id.
Any pointers ?
thanks |
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| elvis_gn |
| Posted: Wed Mar 01, 2006 4:47 am Post subject: |
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Padawan
Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
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Hi happyj,
Could you explain your requirement please....
Regards. |
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| wschutz |
| Posted: Wed Mar 01, 2006 5:01 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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I would think you'd be better off writing / getting a java checksum generator and then implememeting that in the broker (if v6 = java compute node, else java proc ....) rather than in esql .....
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-wayne |
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| happyj |
| Posted: Wed Mar 01, 2006 5:05 am Post subject: |
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Voyager
Joined: 07 Feb 2005
Posts: 87
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thanks
I am on V5 ( apologies for not saying ) |
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| happyj |
| Posted: Wed Mar 01, 2006 5:39 am Post subject: |
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Voyager
Joined: 07 Feb 2005
Posts: 87
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elvis_gn
I am dealing with a lot of data (many, large messages)
coming in much of which is repeated.
because of this I would like to change the flow processing depending on
if it is a repeat or not and not have to store the entire message. |
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| kimbert |
| Posted: Wed Mar 01, 2006 8:02 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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| If the messages are very large, the size of the input bitstream might be as good a hash value as any. If you're going to avoid storing the message, then presumably you're going to have to check every byte at some point before you assume that they're identical. |
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| fjb_saper |
| Posted: Wed Mar 01, 2006 1:05 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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You could as well use an MD5 hash to check for identity...
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MQ & Broker admin |
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