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| Bichu |
 Posted: Wed Nov 09, 2016 3:21 am Post subject: How to start and stop message flows at particular intervals |
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Centurion
Joined: 16 Oct 2011
Posts: 124
Location: London
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Hi All,
I have a requirement for a file fetch from a directory that will be delivered only once in a week. So I designed a message flow which will trigger an input messages to the file read node using MQ input node to read the directory. I thought of writing a cron job which will scan the directory and if file is present, it will trigger a message to the queue listened by the mq input node using amqsput command.
how can i start or stop the message flow only at periodic intervals or when some other criteria meets. |
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| fjb_saper |
| Posted: Wed Nov 09, 2016 5:40 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY
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Why send the message on a cron job? Why not have the sender send the message to the trigger queue when it is done and the file is complete?
In fact why have a file at all? Have the sender send messages instead of a file. 
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MQ & Broker admin |
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| mqjeff |
| Posted: Wed Nov 09, 2016 6:09 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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What happens if the clock on the machine putting the file into that directory is 5 seconds slower than the clock on the machine running the cron job...
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| Bichu |
| Posted: Wed Nov 09, 2016 6:58 am Post subject: |
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Centurion
Joined: 16 Oct 2011
Posts: 124
Location: London
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| fjb_saper wrote: |
Why send the message on a cron job? Why not have the sender send the message to the trigger queue when it is done and the file is complete?
In fact why have a file at all? Have the sender send messages instead of a file. |
The sender dont have an MQ end to send the messages. Hence if the file is present in the directory, IIB needs to pick the message. for which I am using File Read node which in turn needs a dummy message. |
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| Vitor |
| Posted: Wed Nov 09, 2016 7:11 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Bichu wrote: |
| Hence if the file is present in the directory, IIB needs to pick the message. for which I am using File Read node which in turn needs a dummy message. |
Why not a FileInput?
What if the clocks are out of sync as my most worthy associate suggests?
What if the clocks are fine but the weekly process to produce the file runs for 30 minutes longer than it usually does? Or starts late due to some delay in the upstream process?
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Honesty is the best policy.
Insanity is the best defence. |
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