| Author |
Message
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| Paul D |
 Posted: Fri Jul 08, 2005 12:29 pm Post subject: Wire format of JMS Pub Sub Topic Destination |
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Master
Joined: 16 May 2001
Posts: 200
Location: Green Bay Packer Country
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How are multiple topics on a publish message formatted? I know a single one looks like this (from Message Broker Trace...)
| Code: |
(0x01000000):jms = (
(0x01000000):Dst = (
(0x02000000): = 'topic://STOCK/IBM/PRICE'
)
(0x01000000):Dlv = (
(0x02000000): = '1'
) |
Are the topics space seperated?
| Code: |
(0x01000000):jms = (
(0x01000000):Dst = (
(0x02000000): = 'topic://STOCK/IBM/PRICE1 STOCK/IBM/PRICE2'
)
(0x01000000):Dlv = (
(0x02000000): = '1'
) |
I guess I'm assuming that this is supported in JMS. Any help here would be much appreciated. I'm trying to code this correctly in a Message Broker application.
_________________
Thanks!!!
Paul D |
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| jefflowrey |
| Posted: Fri Jul 08, 2005 1:34 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Since JMS uses URL formats for lots of things, including the topic, I doubt that space separation would work.
I also doubt that any single message can be published to more than one topic simultaneously... I'm not positive on this, but it would be surprising - and somewhat illogical.
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I am *not* the model of the modern major general. |
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| bower5932 |
| Posted: Fri Jul 08, 2005 1:43 pm Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| I didn't think this was supported on JMS. You have to code it up yourself using the RFH2 header to get it to work. I thought there were details in either the MA0C manual or the WBI BRoker Pub/Sub manual. |
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| fjb_saper |
| Posted: Fri Jul 08, 2005 5:42 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Looks to me your topic hierarchy is not right
You should have something like
//STOCK/IBM/PRICE/PRICE1
//STOCK/IBM/PRICE/PRICE2
Then when you publish/subscribe to
//STOCK/IBM/PRICE
you would in fact receive the messages for both price/price1 and price/price2 and the general ones for price.
Enjoy
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| bower5932 |
| Posted: Mon Jul 11, 2005 10:01 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| fjb_saper wrote: |
Then when you publish/subscribe to //STOCK/IBM/PRICE
you would in fact receive the messages for both price/price1 and price/price2 and the general ones for price. |
I don't think publishing on stock/ibm will get messages passed to subscribers of stock/ibm/price1 and stock/ibm/price2. |
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| jefflowrey |
| Posted: Mon Jul 11, 2005 10:08 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I think subscribing to IBM/stock/price/(wildcard) will give you publications to IBM/stock/price, IBM/stock/price/price1 and IBM/stock/price/price2.
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| Paul D |
| Posted: Mon Jul 11, 2005 10:14 am Post subject: |
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Master
Joined: 16 May 2001
Posts: 200
Location: Green Bay Packer Country
|
I'm OK with the wildcarding. That was just an example. My question still centers around publishing a single message with two topics. We've done this with our MQ Pub Sub apps under RFH V1 and the MQ API. I assume that the Pub Sub Broker, either MQ or MB/Event Broker always looks at it's non-JMS folders (psc or MQPS* values) and not the JMS folder values when it does it's routing. I've got a blend of these and I'm trying to understand what happens if I've got a MQ Pub Sub publisher that publishes a message with two topics and I try and convert that over to a JMS RFH v2 type message. Can I get that second topic reflected in the JMS folder?
_________________
Thanks!!!
Paul D |
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| jefflowrey |
| Posted: Mon Jul 11, 2005 10:17 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Why not publish it twice?
It seems counter-intuitive to me to have one message that belongs to two topics.
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| Paul D |
| Posted: Mon Jul 11, 2005 10:20 am Post subject: |
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Master
Joined: 16 May 2001
Posts: 200
Location: Green Bay Packer Country
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I understand that. This already exists in our environment. We don't want to change the publisher. I'd best describe it as actual event that triggers two events on the Pub Sub topic hierarchy.
_________________
Thanks!!!
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| jefflowrey |
| Posted: Mon Jul 11, 2005 10:26 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Well, apparently, it can be done anyway.
The Using Pub/Sub manual says , in describing the Publish command, "Topic can be repeated for as many topics as required."
So I guess that means you just add more Dst entries to the jms folder.
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| Paul D |
| Posted: Mon Jul 11, 2005 10:32 am Post subject: |
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Master
Joined: 16 May 2001
Posts: 200
Location: Green Bay Packer Country
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Yes, absolutely, that is known. It's the JMS calls and folders that I'm getting at. That which you refer to is the MQPS* tag values in RFH1. That manual covers MQ API and AMI, but not JMS. I'll do some more testing and research and report back to the thread.
_________________
Thanks!!!
Paul D |
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