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MQSeries.net Forum IndexWebSphere Message Broker SupportApplication launch order

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Jenum
PostPosted: Wed Mar 20, 2019 10:10 pm Post subject: Application launch order Reply with quote

Novice

Joined: 13 Nov 2012
Posts: 24

Good day!
Is it possible to determine the order of launching applications at the start of the execution group?
It is need to start specific application first, which will be configure some parameters for other applications.
I know about "start mode" parameter, but i want to safe exactly "Maintained" value for all applications.

P.S. I use IIB 10.0.0.13.
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timber
PostPosted: Thu Mar 21, 2019 2:56 am Post subject: Reply with quote

Guardian

Joined: 25 Aug 2015
Posts: 961

IIB does not have any mechanism to declare dependencies between message flows. Message flows should be designed to be independent of one another.

One solution is to store the config for each message flow in a SHARED variable that gets initialized the first time the message flow runs.
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Jenum
PostPosted: Thu Mar 21, 2019 4:57 am Post subject: Reply with quote

Novice

Joined: 13 Nov 2012
Posts: 24

It's a pity i want to don't start message handling until settings for the flow would be obtained.
It seems like it is need to use "start mode" + CMP
Thank you for reply!
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Vitor
PostPosted: Thu Mar 21, 2019 5:11 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25614
Location: Ohio, USA

I'm inclined to agree with my worthy associate. Building this kind of dependency can make your solution brittle. What would happen if (as an example) one of the applications had to be restarted due to an issue? You're stuck with restarting the entire execution group, which is a pain, unless the broker automatically restarts an application and you don't notice you need to restart the entire execution group and then you have a huge mess on your hands.

Your site, your solution, your judgement of course but it's worth keeping this sort of thing in mind during the design phase. The more robust your solution, the less you're woken up at 3am because the sky is falling.
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