Hello,
I need help to understand which is the best way to handle this scenario.
*General information*:
1. I consume messages from an *Azure* queue that collects "status"
messages. Each message rappresents a passing of state for a specific
entity instance.
2. I have entity instance E1 with initial status S1
3. E1 status flow is:
1. from status S1 -> S2
2. from status S2 -> S3
3. Is not valid other kind of status passage (for example S1 -> S3)
*Standard scenario*: when I consume messages where the status flow is
valid there are no problems
* In the queue there are both messages with "E1 - S2" and "E1 - S3"
* I receive message with "E1 - S2" -> E1 status will be changed in S2
* Then I receive message with "E1 - S3" -> E1 status will be changed in S3
* CORRECT
*Particular scenario*: if my message consumer receives unsorted
messages, I could lose information.
* In the queue there are both messages with "E1 - S2" and "E1 - S3"
* I receive message with "E1 - S3" -> NOT VALID, E1 status will still
be S1
o The message ackType is MODIFIED_FAILED because it is a trasient
error. If in next consuming attempts I have consumed message "E1
- S2" successfully, also this message can be consumed successfully
* If I have maximum 10 retries before deadletter.
* If I would consume 10 times message "E1 - S3" before "E1 - S2" ->
Message "E1 - S3" would go in Deadletter and I would lose that
information
Basically my scenario is composed by "consecutive" messages because they
must follow a specific state diagram. Each status is important it must
be consumed before the next; it wouldn't be acceptable just to take the
latest one.
My question now is: how do AMQP and QPID handle this kind of scenario?
Best Regards
--
SMC Consulting <http://www.smcconsulting.it>
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*Alessandro Crotti*
Senior Developer
tel: +39 342 573 4450
skype: crotti.alessandro
*SMC Consulting* <http://www.smcconsulting.it>
Via dell'industria, 87 41012 Carpi (MO) - Italy
tel: +39 059 664875
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