[jboss-as7-dev] Add Notification support to the domain management API

[Heiko Braun]

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 at 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/AddNotificationSupportToTheDomainManagementAPI
> 
> -- 
> Jeff Mesnil
> JBoss, a division of Red Hat
> http://jmesnil.net/
> 
> 
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