[opencms-dev] RE: RE: Retrieve data from CmsEvent

Thu Oct 12 16:16:17 CEST 2006

Thanks for your help, Jon.

Regarding the use of OpenCms-Events: I usually wouldn't need a custom event
handling at all. But the well known case of creating siblings of XMLContent
in a multilingual OpenCms environment has literally forced me to use them. I
hope there will be an overhaul of the whole multilanguage
support/implementation in a future version of OpenCms.

Roman

Jonathan Woods wrote:
> 
> 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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