Re: [jboss-as7-dev] Add Notification support to the domain management API
I have some questions regarding your example, where you describe that a notification is
emitted (n1) when an attribute value changed and a client (curl) executes two subsequent
POST requests (p1, p2) to fetch notifications.
I am wondering what the semantics are for processing/delivering notifications. What can
clients expect?
- Stream of notifications: Clients get to see what exists at a given point in time. There
is the possibility to miss notifications.
- Durable subscriptions: Regardless of a clients availability and polling interval, it
will always get all notifications since the last time it connected. It's not possible
to miss notifications.
- Time windows: Notifications are kept for a certain amount of time, during that interval
clients get the same snapshot, regardless how many times they poll? It's possible to
miss notifications if the polling frequency is much bigger then the window size.
Regards, Heiko
On Mar 5, 2013, at 6:11 PM, Jeff Mesnil <jmesnil(a)redhat.com> wrote:
I've updated the documentation about adding notification to
AS7[1]
I think I've defined the most important parts that clients needs to know to deal with
AS7 notifications:
* describe notifications in AS7 resource model
* define global notifications supported by all resources
* AS7 service to register/unregister local listener + emit notifications
* HTTP API
* plain HTTP with polling notifications
* Web-browser specific to push notifications using Server-sent events
* extra methods to the Java management API to register/unregister listeners in Java
clients
Note the doc does not define all the notifications that can be emitted by AS7 resources.
The idea is that the AS7 resource model describes them (like attributes and operations)
so that the client can use the description to know which resources emit notifications (and
their types).
jeff
[1] https://community.jboss.org/wiki/AddNotificationSupportToTheDomainManagem...
--
Jeff Mesnil
JBoss, a division of Red Hat
http://jmesnil.net/
_______________________________________________
jboss-as7-dev mailing list
jboss-as7-dev(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/jboss-as7-dev