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| Fire Flow When All Messages in MQ are Processed (MQ Empty) |
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| ReemRashwan |
 Posted: Mon Aug 23, 2021 5:18 am Post subject: Fire Flow When All Messages in MQ are Processed (MQ Empty) |
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Novice
Joined: 09 Mar 2021
Posts: 12
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TL;DR I need to monitor a queue when its empty after being filled with messages, how can I do that?
Understanding The Application
Hi, I have the following flows in my application
Flow 1: HTTP Input -> some nodes -> HTTP Request (get list of data from other system) -> Compute Node (to split data list into one message at a time) -> MQ Output Node (Name: APPIN)
Flow 2: MQ Input (APPIN) -> some heavy processing -> send data to other system.
Flow 3: HTTP Input -> Nodes to collect some statistics from other systems that is dependent on flow 2 output.
I have a cron job that starts the application using http node in flow 1. Flow 2 may take one or two hours dependening on incoming data from other systems even with multithreading. Flow 3 is called on demand whenever statistics are required
The Question
How can I monitor my queue when its done processing all message that came from other systems, say I have 2000 messages, I need to fire flow 3 only when all of these messages are processed (either succeeded or failed after retries). Any ideas? |
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| silly_name |
| Posted: Wed Oct 27, 2021 1:18 pm Post subject: Fire Flow When All Messages in MQ are Processed (MQ Empty) |
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Newbie
Joined: 26 Oct 2021
Posts: 5
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Not 100% sure on what your requirement here is.
You said:
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Flow 3: HTTP Input -> Nodes to collect some statistics from other systems that is dependent on flow 2 output.
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Do "other systems" not need to do some processing of their own before you can "collect statistics" ? Or is it that you send that data synchronously and they don't do anything to it once flow 2 has completed for each message?
Sticking to your original query, the simplest and most robust way I can think of it is persist in Flow 1 (in a DB?) the initial list of messages - some identifier at least. Then update the status of each identifier in Flow 2. Flow 3 would then run on a timer and query if everything was processed.
Of course things brings to mind a list of other considerations: how do you want to handle errors in case for instance a message is *never* processed, how do you want to archive/cleanup previous runs (sounds like you run in batches once per day?).
Later edit: This sounds like a scenario for the aggregation pattern. Have you looked at the aggregation nodes?
https://www.ibm.com/docs/en/integration-bus/10.0?topic=nodes-group-aggregation
Cheers,
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| gbaddeley |
| Posted: Wed Oct 27, 2021 2:14 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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