On Sep 11, 2009, at 1:31 AM, John Panzer wrote:
Without getting into the appropriate discussion form question, what
hub resource semantics (and link relation definition) are you
referring to exactly? I can't seem to find it, and it's hard to
understand your objection without it.
Section 7.3 says:
"If, after a content fetch, the hub determines that the topic feed
content has changed, the hub MUST send information about the changes
to each of the subscribers to the topic."
I understand this to imply that subscribers expect the hub to
definitely send the notifications. What if the hub decides not to due
to the number of subscribers it has? Or to turn this around: how would
a subscriber ever know whether not receiving notifications means that
there are not updates or that the hub stopped sending notifications.
Jan
On Thu, Sep 10, 2009 at 12:40 PM, Jan Algermissen <[email protected]
> wrote:
Lisa,
not sure the following it is appropriate to discuss this here, so
please redirect me to the proper place if so.
Hubs are being discovered by clients by way of the 'hub' link
relation. I am
concerned that the semantics of a hub resource (provided by the link
relation
definition) are imposing obligations on the server that are contrary
what one
would expect to see in the HTTP world.
Or in other words: I think that the assumptions a client makes about
the behaviour
of a hub are too rigid. If a hub has more subscribers than it knows
it can handle
it might well decide not to notify them. A situation like this is
impossible to
prevent by the specification and I think the server should therefore
explicitly be
given much more freedom regarding its behavior upon a ping.
Especially given the use of Atom which in a sense implies a very
unconstrained
protocol.
(Sorry if this discussion is already going on elsewhere)
Jan
On Sep 10, 2009, at 7:30 PM, Lisa Dusseault wrote:
Comments welcome on the following request
thx,
lisa
---
General Request for Assignments (link-relations)
Contact Name :
Brett Slatkin
Type of Assignment :
I want to add a new Atom Link Relation type for the PubSubHubbub
protocol
(http://pubsubhubbub.googlecode.com). The relation type is "hub".
Registry :
http://www.iana.org/assignments/link-relations/link-relations.xhtml
Description :
The new is used for discovery of Hubs,
which enables real-time notifications of entries in Atom and RSS
feeds.
Without making the relation type official, we're not in compliance
with the
Atom spec.
Additional Info :
http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-
core-0.1.html
