I agree completely with the idea of breaking out polling into a more
reusable component. The idea of having some sort of poll() or trigger()
verb in the DSL is extremely appealing. As far as creating a seperate
scheduler, how far off is camel-quartz from providing support for this
already?
- aaron
On Sat, Sep 27, 2008 at 5:43 AM, Claus Ibsen <[EMAIL PROTECTED]> wrote:
> Hi
>
> I have updated the 2.0 design wiki page.
>
> I think one of the main new features should be nice DSL support for
> schedule polls. Currently in camel the consumer endpoints might support
> ScheduledPolls but then its very basic timing (initial delay, delay,
> fixed/rate) using the simple Timer scheduler in Java.
>
> As end-users need to configure this on the endpoint directly usually in the
> from route as:
>
> from("file://dir?consumer.delay=60000").to("bean:processFile");
>
> Since we have a mess with the options, as you need the "consumer." prefix
> thsat confuses people. I would love to get rid of it so it was just as
> before (there isn't a name clash anyway)
>
> from("file://dir?delay=60000").to("bean:processFile");
>
> However this DSL is very basic and not all consumer endpoints support this
> scheduling - for instance iBatis, HTTP etc. It is actually not the
> responsibility of the component to handle the scheduling. The consumer
> should just run when it's invoked (receive()). However we need to support
> timeout also. receive(), receiveNoWait() receive(Timeout);
>
> So I propose to @deprecated or at least reduce the usage of
> ScheduledPollConsumer. We should let the schedule be triggered elsewhere,
> (such as the timer as now). But with build in nice DSL support.
>
> schedule().every(5).minute().from("file://dir").to("bean:processFile")
>
> And we could consider have a poll() syntax:
> schedule().every(5).minute().poll("file://dir").to("bean:processFile")
>
> We could consider allow ref for schedulers:
> from(("file://dir?scheduler=pollFtpFiles").to("bean:processFile")
> to allow the old from syntax but with nice spring configuration support.
>
> <bean id="pollFtpFiles" class="org.apache...ScheduleBuilder">
> <option name="delay" value="5"/>
> <option name="unit" value="minute"/>
> <option name="fixed" value="true "/>
> <option name="initalDelay" value="10"/>
> </bean>
>
> However would be a little challenge to have nice names to allow easy
> configuration that is easy for end-users to read and understand:
>
>
> Later we can improve this builder syntax to allow cron like expression. Now
> we need Hadrians pluggable DSL ;)
>
>
> Med venlig hilsen
>
> Claus Ibsen
> ......................................
> Silverbullet
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>
>
