[jira] [Closed] (DISPATCH-5) Execute a program when a message arrives addressed to a specific address

["Ted Ross (JIRA)" <ji...@apache.org>]

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

Ted Ross closed DISPATCH-5.
---------------------------

    Resolution: Won't Fix

I'm closing this issue as out-of-scope for Dispatch.  I think this would be better implemented in an endpoint that listens on AMQP addresses (perhaps through a network of routers).


> 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 message.
> 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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