[opencms-dev] RE: Retrieve data from CmsEvent

[Jonathan Woods]

No problem.

I'm sorry if I was being overly negative about the event framework; maybe
you'll get on better with it.  Primarily because it isn't well documented
and multiple events are fired for single stimuli, I was just uneasy about
relying on it - for example to make programmatic changes when resources are
saved by end users.

Concerning LOG: in my example it's a (static member which is an) instance of
the org.apache.commons.logging.LogFactory class:

---------
private static final Log LOG = LogFactory.getLog(Class
theClassYouWantToAssociateWithLogEntries);
---------

This does indeed write into the OpenCms log.

Jon

-----Original Message-----
From: opencms-dev-bounces at opencms.org
[mailto:opencms-dev-bounces at opencms.org] On Behalf Of Roman Uhlig
Sent: 12 October 2006 14:47
To: opencms-dev at opencms.org
Subject: [opencms-dev] RE: Retrieve data from CmsEvent


Thanks Jon, this definitely points me in the right direction.
Your side note states that you have experienced strange behaviour using
OpenCms events? While playing around with it, I didn't notice any unusual
behaviour, at least not with the basic events like
EVENT_RESOURCE_CREATED/DELETED. Do you think it's unsafe to rely on these
events?

Just a little side question: I noticed you are using a LOG var in your
sample code. Do you use it to write into the opencms.log file? How would I
obtain such an instance? I planned to investigate this during the next days,
so maybe you could please give me another hint?

Thanks,
Roman


Jonathan Woods wrote:
> 
> Here's what I used before I gave up trying to guess in what order and 
> for what reason CmsEvents were called...
> 
> Jon
> --------------
> 
> // Get a list of all file resources concerned with this event. There 
> may be only one resource, presented via map // key "resource", or 
> there may be a list underneath "resources". See I_CmsEventListener for 
> documentation.
> 
> Map eventData = event.getData();
> int eventType = event.getType();
> 
> List<CmsResource> resourceList;
> 
> try {
> 	if (eventData.containsKey("resources")) {
> 		resourceList = (List<CmsResource>)
> eventData.get("resources");
> 	}
> 	else if (eventData.containsKey("resource")) {
> 		resourceList = new ArrayList<CmsResource>(1);
> 		resourceList.add((CmsResource) eventData.get("resource"));
> 	}
> 	else {
> 		LOG.error("handleEvent called for event with no associated
> resource(s) - may be indication that module code is incompatible with 
> OpenCms version");
> 		return;
> 	}
> }
> catch (ClassCastException e) {
> 	// Should not be possible; may indicate that OpenCms version has 
> bumped.
> 		LOG.error("Unexpected type met in event data - may be
indication 
> that module code is incompatible with OpenCms version", e);
> 	return;
> }
> 
> -----Original Message-----
> From: opencms-dev-bounces at opencms.org
> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of Uhlig, Roman 
> Knuepfer Verlag
> Sent: 12 October 2006 14:19
> To: The OpenCms mailing list
> Subject: [opencms-dev] Retrieve data from CmsEvent
> 
> 
> Hi,
> what would be the right way to retrieve the data related to a 
> CmsEvent, let's say the resource name of a deleted resource in case of 
> a EVENT_RESOURCE_DELETED event?
> 
> CmsEvent.getData() returns a map, but it has only one key ("resources"):
> 
> resources = [[org.opencms.file.CmsResource, path:
> /sites/default/test/bla, structure id
> 86ff16fb-59ec-11db-bc78-000c29e71d53, resource id:
> 86ff16fc-59ec-11db-bc78-000c29e71d53, type id: 1, folder: false, flags:
> 0, project: 4, state: 2, date created: Thu Oct 12 12:23:54 GMT 2006, 
> user
> created: d12bc550-4199-11db-a4a5-000c29e71d53, date lastmodified:
> Thu Oct 12 12:23:54 GMT 2006, user lastmodified:
> d12bc550-4199-11db-a4a5-000c29e71d53, date released: Thu Jan 01 
> 00:00:00 GMT 1970, date expired: Sun Aug 17 07:12:55 GMT 292278994, 
> size: 0 sibling
> count: 1]]
> 
> I also can't find the I_CmsEventListener.KEY_* values in this list. Am 
> I doing something wrong? Any help would be very appreciated.
> 
> Thanks,
> Roman
> 
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