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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DISPATCH-5) Execute a program when a message arrives addressed to a specific address
Date Thu, 30 Jan 2014 18:46:09 GMT

     [ https://issues.apache.org/jira/browse/DISPATCH-5?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ted Ross updated DISPATCH-5:

    Reporter: Sean Gallagher  (was: Ted Ross)

> Execute a program when a message arrives addressed to a specific address
> ------------------------------------------------------------------------
>                 Key: DISPATCH-5
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-5
>             Project: Qpid Dispatch
>          Issue Type: Improvement
>            Reporter: Sean Gallagher
>            Priority: Minor
> Start a server (if not already running) when a message arrives at a pre-configured address.
> Broadly similar in intent to xinetd or http CGI scripts.
> My application has some large jobs that execute infrequently. It would be good if these
could be run on demand rather than keeping a large process in memory that does nothing most
of the time. Having the server restart when needed is also a good guard against resource leaks
/ selfish garbage collectors.
> There doesn't seem to be a convenient way to do this at present but I'm thinking it might
be added relatively easily to Dispatch Router and I suspect many would find it useful.
> Working out locks / race conditions would be tricky but one simple idea I had would be
to execute a user-supplied command line when a message arrives and then lockout further invocations
for a configurable time period. This would give the new server time to startup and connect
to Dispatch. Dispatch would not invoke the command if a link was available to deliver the
> A section could be added to qpid-dispatch.conf to configure this. e.g.
> on-demand
> { ## ## deliveries to this address will trigger the command if link does not already
exist ## to: myserver/myservice ## ## command line to run ## run: myprogram ## ## delay after
triggering the command before it may be retried (in response to a new delivery) ## lockout-interval:
60 }
> This idea could be further developed in many directions, what I've put here is the basics.

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