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From Christopher Shannon <christopher.l.shan...@gmail.com>
Subject Re: [DISCUSS] Artemis missing advisories and producer tracking
Date Wed, 12 Oct 2016 14:31:44 GMT
I would say that for JMS (and certainly OpenWire) a producer should be
considered created when making that create producer call on a JMS client.
At least with OpenWire that ProducerInfo object is sent immediately on
creation and is tracked.

However for other protocols that isn't the case and lazy notification might
make more sense but it would be different behavior than 5.x which may or
may not be ok.  So really we need to decide what our strategy is and
whether or not we try to make advisory processing uniform across all
protocols like 5.x or if we leave something like when a producer advisory
is sent up to each individual protocol.


On Wed, Oct 12, 2016 at 10:17 AM, Jim Gomes <jgomes@apache.org> wrote:

> +1 for supporting all the advisories that the current ActiveMQ 5.x
> supports.
>
> As for when the advisory message is sent for a Producer, I'm not sure there
> is a specific guarantee about that. If a Producer is 'created', but a
> message is never sent, was it actually created? I'm not necessarily opposed
> to the lazy notification strategy.
>
>
> On Wed, Oct 12, 2016, 6:48 AM Christopher Shannon <
> christopher.l.shannon@gmail.com> wrote:
>
> > Also as a follow up, I noticed that the OpenWireProtocalManager already
> > fires a couple advisories for new connections/destinations.  I can
> > certainly create a PR to add more advisories but I guess really the
> > question is whether or not we should support the advisories across any
> > protocol or not.
> >
> > On Wed, Oct 12, 2016 at 8:32 AM, Christopher Shannon <
> > christopher.l.shannon@gmail.com> wrote:
> >
> > > In general it would be nice if all of the current advisories that are
> > > supported in 5.x could eventually be supported in Artemis as well.
>  As I
> > > was looking at Artemis's notifications to see what currently existed
> one
> > > thing I noticed was that there is a lack of producer notifications.
> > Having
> > > an advisory sent when a producer is created is something that I know I
> > use
> > > all the time.
> > >
> > > I dug into this and it looks like the reason is because Artemis doesn't
> > > actually track a producer until the first message is sent.  In fact
> > there's
> > > no notion of a producer on the core wire format at all (there's no
> packet
> > > type for it).
> > >
> > > I realize that many protocols don't have the notion of a producer...In
> > 5.x
> > > this is handled by just creating ProducerInfo objects on first
> connection
> > > when a protocol doesn't support it (ie Stomp, etc). However, the JMS
> API
> > > does have a specific call to create a producer so I find it useful to
> get
> > > an advisory message and to track when producers come online even if not
> > > every protocol supports this.
> > >
> > > So I guess I wanted to see what people thought about adding a
> > notification
> > > for producers and also trying to fill in the gaps for the rest of the
> > > advisory topics that are missing.
> > >
> >
>

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