custom dam media handlers

[HarishDv]

I created a custom dam media handler for a RAW file format .pef.

But when i try to insert a .pef file in my dam , the default handler gets called.

What should i do to make this handler get called , when i insert that file.

Thanks in advance.

Harish

[smacdonald2008]

I have been digging into this functionality a bit over the past couple of days. We will be pushing out an article that shows functioning code for this use case soon (by the end of April). Anyhow, I was told today by the Eng team that you can get your DAM handler to be called first over the others by using a service ranking in your OSGi bundle. To learn how to implement a service ranking -- see:

http://www.vogella.com/tutorials/OSGiServices/article.html

I will update this forum thread once the DAM Handler article is pushed live. 

[Sham_HC]

Have you followed [1]?

[1]  http://dev.day.com/docs/en/cq/current/dam/dam_media_handlers.html

[smacdonald2008 · Accepted solution]

Here is the new article that will walk you through this use case -- including how to set the Service ranking so that your DAM media handler is invoked. See:

http://helpx.adobe.com/experience-manager/using/damhandler.html

[HarishDv]

Hi sham ,

Thanks for the reply .

I did try to write a similar code for .PEF file as defined in the link http://dev.day.com/docs/en/cq/current/dam/dam_media_handlers.html  (for text/plain).

Moreover the example in the link extends  com.day.cq.dam.core.AbstractAssetHandler which is deprecated .I tried implementing AssetHandler and extending com.day.cq.dam.commons.handler.AbstractAssetHandler .

This PEF Handler is active , but is never called (when uploading this asset type in DAM). There are no errors .

Only the Generic asset handler is invoked .Please suggest ways to get this handler called .

[smacdonald2008]

Here is the code to ensure that your DAM handler is called. Notice use of Service Ranking. 

@Component
@Service

@Properties({
  @Property(name = Constants.SERVICE_RANKING , intValue  = 100) })

public class MyHandler extends AbstractAssetHandler  { 

The full article will be published on Fri April 25.

[wim_van_den_bra]

Many thanks for the update and the reviewed document. I'm quite happy to confirm the new instructions and the new DAM handler work like a charm. I followed procedures in detail and reused the available POM and source code and the customized media handler kicks in as  expected (and as a consequence my work during this weekend seems to pay off). 

Just a few minor or cosmetic-like improvements:

• artificact cq-dam-api has been described twice in the poc (line 65 and 168) resulting in a warning during validation
• there are two references to adone instead of adobe ;-) 
• I think the "certificate" image  (getThumbnailImage method) as used in the example is not available in the default installation but it's possible I've removed this image in the past 
• when I import a digital asset of type text, I noticed an error during the invocation of the createThumbnail method. I plan to investigate this error more in detail next week. 
• quite important, to me the second document (http://dev.day.com/docs/en/cq/current/dam/dam_media_handlers.html) seems rather a duplicate of the initial document as mentioned above. Maybe it's worth while removing this document? 

And as a final question. Quite likely we'll have to import 10.000 digital assets as part of a conversion we plan to execute. Additional DAM related documents/development guides would be very much appreciated. 

all the best and thanks again for the update,

Wim

[Scott_Brodersen]

Sorry I can't help with your problem, but I just wanted to let you know that we have an issue logged against the documentation for this, and I've bumped up the priority.

scott

[wim_van_den_bra]

Cool. AFAIK it's now April 2014 and TMHO the documentation is still outdated. Any chance the documentation for AEM v6 (expected soon) will point to the correct classes? 

many thanks, 

Wim

[smacdonald2008]

The community team is working on this use case -- we will push out an article soon.