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| Calling Webservices using PUBSUB mechanism |
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| monangi1 |
 Posted: Sun Feb 02, 2014 9:14 pm Post subject: Calling Webservices using PUBSUB mechanism |
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Novice
Joined: 02 Feb 2014
Posts: 11
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HI Every One,
I am looking for invoking a WEB SERVICE using PUB SUB mechanism in IIB9. If anybody having any idea or documentation, please share your thoughts. Thanks in advance. |
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| Esa |
| Posted: Sun Feb 02, 2014 11:43 pm Post subject: |
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Grand Master
Joined: 22 May 2008
Posts: 1387
Location: Finland
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I don't think there is any standard for publish-subcribe for web Services. If there is, I would be very interested to hear about it.
I once implemented such thing, for one-way operations only. Supporting request-reply operations would have been at least twice as complicated.
Subsriptions were made by administratively adding a row in a database.
What made the scenario complicated is that web services are not transactional. You cannot roll back the whole operation if one of the endpoints is down, because others may already have committed. Our solution was to queue and retry calls for endpoints that are down.
That flow is still perhaps the most complex I have ever written. I later created a subflow version of it. If you dragged the subflow into a message flow and connected all terminals, the flow diagram looked like a shamrock with double petals. Or something like that.
Good Luck! |
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| Simbu |
| Posted: Mon Feb 03, 2014 1:28 am Post subject: |
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Master
Joined: 17 Jun 2011
Posts: 289
Location: Tamil Nadu, India
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| Have you considered SOAP/JMS WebService? It supports PUB SUB mechanism. |
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| Esa |
| Posted: Mon Feb 03, 2014 1:44 am Post subject: |
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Grand Master
Joined: 22 May 2008
Posts: 1387
Location: Finland
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| Simbu wrote: |
| Have you considered SOAP/JMS WebService? It supports PUB SUB mechanism. |
Good point. That should be much simpler to implement than with http-based web services. Taking a round-trip via JMS pub-sub might also work even if the actual web services were http-based. |
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