I take back my most recent suggestion on looking at opennms-
correlator. Look at opennms-jetty, instead. You'll want to uncomment
the constructor-arg bit referencing daemonContext in
beanRefContext.xml and also inject eventIpcManager into your daemon
classin your applicationContext-foo. xml file.
- djg
On Nov 24, 2008, at 4:30 PM, "Levin, Gary Marc" <[EMAIL PROTECTED]>
wrote:
> Thanks, I think.
>
> I don't have experience with Spring, so this will take some time for
> me to digest. I was rather hoping there was a way to register an
> EventListener without rebuilding the OpenNMS.
>
> If I am understanding correctly, beanRefContext.xml is used at build
> time, not run time, so if I update that file, I need to get the
> source and rebuild the system.
>
> As far as I can tell, I can create a NotificationStrategy and
> register it without access to the source code for OpenNMS. This
> does not seem to be true for the path you suggested for the
> EventListener. Is there a non-Spring approach to add a simple
> Listener, or do I need to adopt the whole Spring Framework to add a
> new service. I understand why you might wish to have a consistent
> structure for adding new services, so I won't try to buck the trend.
>
> ===========================
>
> Decided to try something differently. I tried basing my entry on
> <name>OpenNMS:Name=Queued</name>
> <class-name>org.opennms.netmgt.queued.jmx.Queued</class-name>
> <invoke at="start" pass="0" method="init"/>
> <invoke at="start" pass="1" method="start"/>
> <invoke at="status" pass="0" method="status"/>
> <invoke at="stop" pass="0" method="stop"/>
> </service>
> and opennms would not start because of missing Spring Contexts (I
> expect that is what the beanRefContext is for)
>
>
> Then I tried
> <service>
> <name>OpenNMS:Name=DramaConverter</name>
> <class-
> name>com.telcordia.ar.drama.opennms.dramabeans.jmx.DramaConverter</
> class-name>
> </service>
> and OpenNMS starts up fine. Apparently, the <invoke> elements
> caused a problem with the system looking for a SpringContext.
>
> Unfortunately, now the class does not get referenced and no methods
> are called. I tried adding static initializers to instantiate a
> singleton and register it, but they are not invoked. So I guess the
> simpler approach won't work. Time to install Maven and build from
> scratch.
>
> Gary Levin
> RRC 1N345
> Telcordia Technologies
>
>
>> -----Original Message-----
>> From: DJ Gregor [mailto:[EMAIL PROTECTED]
>> Sent: Friday, November 21, 2008 6:52 PM
>> To: OpenNMS Code Development and Bugs
>> Subject: Re: [opennms-devel] Fetching an Event in a
>> NotificationStrategy
>>
>> You are on the right track. Create a daemon that will get
>> instantiated
>> through configuration in service-configuration.xml. Your daemon will
>> work with EventIpcManager to register for events and install
>> itself as a
>> callback when the events come in. You probably want to use something
>> that does nothing other than event processing as a base, and queued
>> is
>> probably the best thing:
>>
>> opennms-services/src/main/java/org/opennms/netmgt/queued
>>
>> In jmx/Queued.java, you only need the getLoggingPrefix() and
>> getSpringContext() methods--the rest of what is in there is
>> specific to
>> RRD handling. The value returned from getSpringContext() refers to a
>> Spring context defined in
>> opennms-services/src/main/resources/beanRefContext.xml. Let
>> us know if
>> you have any problems figuring this out.
>>
>> Lastly, here is a web page that discusses some of the details of the
>> Spring-loaded daemon infrastructure:
>>
>> http://www.opennms.org/index.php/Using_AbstractSpringContextJm
>> xServiceDaemon_to_dependency_inject_a_daemon
>>
>> Good luck!
>>
>>
>> - djg
>>
>> On Fri, 21 Nov 2008 13:14:40 -0500, "Levin, Gary Marc"
>> <[EMAIL PROTECTED]> said:
>>> Nothing like sending in a request to get the brain going.
>>>
>>> I found that I can use EventIpcManagerFactory to get an
>> EventIpcManager
>>> to which I can register an EventListener of my own. The
>> only tricky part
>>> is figuring out a good place to arrange for the class to
>> register itself.
>>> Is there a clean way to do it? At worst, I can have a
>>> NotificationStrategy registered that instantiates the
>> listener. A hack,
>>> but it works.
>>>
>>>
>>>
>>> Gary Levin
>>> RRC 1N345
>>> Telcordia Technologies
>>>
>>>
>>>> -----Original Message-----
>>>> From: Levin, Gary Marc
>>>> Sent: Friday, November 21, 2008 12:35 PM
>>>> To: 'opennms-devel@lists.sourceforge.net'
>>>> Subject: RE: Fetching an Event in a NotificationStrategy
>>>>
>>>> This is a follow-up to the previous question. I found
>>>> org.opennms.netmgt.xml.event.Event, and I can get the event from
>>>> NotificationFactory based on the EventId in the notification.
>>>> The problem
>>>> is that the event retrieved is incomplete. It is missing the
>>>> parameters
>>>> (which are passed to the notification, because they appear in my
>>>> description).
>>>>
>>>> * No parameters show up in the xml produced by Event.marshal().
>>>> * Event.getParms() returns null
>>>> (1) Is this a bug in org.opennms.netmgt.xml.event.Event?
>>>> (2) Is this a bug in
>>>> org.opennms.netmgt.xml.event.NotificationFactory.getEvent()?
>>>> (Producing an
>>>> incomplete Event)
>>>> (3) Is there an alternative way to get the original event from the
>>>> notification? (I thought that EventFactory would be the way
>>>> to go, but that
>>>> is not accessible from a NotificationStrategy.)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> I am trying to forward the event to another system. If
>>>> necessary, I can put
>>>> enough information into the notification description so that
>>>> I can manually
>>>> construct the event, but it seems like a fragile solution.
>>>>
>>>>
>>>>
>>>>
>>>> If there is a way to capture the event *before* it gets to be a
>>>> notification, that would be even better. An EventListener
>>>> would be ideal.
>>>> (This is where the Uses page would be very helpful.) Is
>>>> there a way to
>>>> register a new EventListener?
>>>>
>>>>
>>>>
>>>>
>>>> Gary Levin
>>>> RRC 1N345
>>>> Telcordia Technologies
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Levin, Gary Marc [mailto:[EMAIL PROTECTED]
>>>>> Sent: Friday, October 31, 2008 3:56 PM
>>>>> To: opennms-devel@lists.sourceforge.net
>>>>> Subject: [opennms-devel] Fetching an Event in a
>> NotificationStrategy
>>>>>
>>>>
>>>>
>>>> I need to fetch the Event that triggered a Notification. I
>>>> have written an
>>>> implementation of NotificationStrategy, which is
>> correctly invoked by
>>>> notifd. The notification places the eventId into the text
>>>> message, which is
>>>> included in the list of arguments passed to
>>>> NotificationStrategy.send(). I
>>>> log this information, so I am sure it is being received correctly.
>>>>
>>>> My code then extracts the eventId, parses it into an integer,
>>>> eid, and tries
>>>> calling EventFactory.getEvent(eid). It gets to that point,
>>>> but the call
>>>> never returns. I catch SQLException, and that is not
>> thrown either.
>>>>
>>>> I tried catching Throwable and found the problem to be
>>>> java.lang.NoClassDefFoundError:
>>>> org/opennms/web/event/EventFactory
>>>> I am guessing this is caused by the EventFactory being loaded
>>>> by a different
>>>> classloader than my NotificationStrategy. This had me go
>>>> look for another
>>>> way to get the event, using the jars in lib and not web-apps.
>>>>
>>>>
>>>>
>>>> I was trying to learn more about the API and noticed that although
>>>> http://www.opennms.org/documentation/java-apidocs-stable/
>>>> org/opennms/netmgt/xml/event/Event.html
>>>> exists, if you go to the frame view, this class and its
>>>> package are not in
>>>> the list of packages and classes.
>>>>
>>>> I found that what I needed was
>>>> org.opennms.netmgt.xml.event.Event, which I
>>>> can get from
>>>> org.opennms.netmgt.xml.event.NotificationFactory. This would
>>>> have been easier to find if the Javadoc included that
>>>> package. Also,having
>>>> the Uses page when I am trying to learn an API. This lets me
>>>> work backwards
>>>> from what I want, in this case an Event.
>>>>
>>>
>>>
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>>> _______________________________________________
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>
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