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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-5063) Execute a program when a message arrives addressed to a specific adress
Date Fri, 09 Aug 2013 18:52:55 GMT

    [ https://issues.apache.org/jira/browse/QPID-5063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735130#comment-13735130
] 

Ted Ross commented on QPID-5063:
--------------------------------

This is a very interesting idea.  I don't think there will be serious lock/race issues with
it.

                
> Execute a program when a message arrives addressed to a specific adress
> -----------------------------------------------------------------------
>
>                 Key: QPID-5063
>                 URL: https://issues.apache.org/jira/browse/QPID-5063
>             Project: Qpid
>          Issue Type: Improvement
>          Components: Qpid Dispatch
>         Environment: linux
>            Reporter: Sean Gallagher
>            Assignee: Ted Ross
>            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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