21 Jul
2007
21 Jul
'07
9:21 a.m.
On Jul 21, 2007, at 5:46 AM, Asiri Rathnayake wrote:
Thanks. I learnt few things about how to make a proper
patch too
(should have done before), my patches are bit too crappy.
I was thinking, can we use this mechanism for purposes like
notifying (send an email or something like that) to the original
author of the document when the document is changed ? Or is some
other mechanism there for this purpose ?
It's a generic purpose mechanism so yes it can be used for what you
suggest. I know Stephane has submitted a plugin for notifications but
I haven't looked at it yes so I don't know if it uses this mechanism
or not. If not, then yes we should probably make it use it as the
other solution (scheduling) is not as good. That said, there are the
2 needs:
* you may want to receive notifications as soon as a page is modified
* or you may want to received notifications, say once a day with all
modifications grouped in a single email
All that said, the primary use case for notifications that I see if
for performance improvements and more specifically for refreshing
caches.
Thanks
-Vincent
On 7/21/07, Vincent Massol <vincent(a)massol.net>
wrote:
For those interested I've sent a patch for implementing a new
notification mechanism.
It's available here:
http://jira.xwiki.org/jira/browse/XWIKI-1522
I'd love to get feedback on this. Here's what I say in there:
"
At the place where you want to register for an event:
getObservationManager().addListener(new DocumentSaveEvent
("DocumentToWatch"), listener);
At the place where you want to receive for an event:
public class MyListener implements EventListener
{
public void onEvent(Event event, Object source, Object data)
{
...
}
}
At the place where you want to fire notifications to event listeners:
getObservationManager().notify(new DocumentSaveEvent
("SomeDocument"), "some source", "some data");
It's easily extensible and you can create all sorts of events as
it's fully generic.
"
Have a look at the implementation. You'll see I have even
introduced the notion of EventFilter so that we can have regex when
registering interest for an event.
Thanks
-Vincent
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