Current method for adding a rendition definition for the thumbnail service?

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oofdachile

Hi, folks –

  I would like to add an ImageMagick thumbnail rendition definition for use by the 4.2e Community thumbnail service.  Jeff wrote a <a href="http://ecmarchitect.com/archives/2009/03/03/913" target="_blank">thorough article</a> on the subject (thanks, Jeff!).  He observed that adding a new thumbnail rendition definition in a slick fashion takes some work.

The out-of-the-box thumbnails are registered in the thumbnail-service-context.xml file. I don’t see a clean way to extend that without repeating the definitions, so in my example, I wrote a bean that calls the Thumbnail Registry and registers the custom thumbnail definitions provided in the Spring context file

… and later in the comments to his post, Umut Utkan observed that one could call the Thumbnail Registry's methods without writing Java code.

Instead of creating a custom bean to register your custom thumbnail definitions, you could have just used MethodInvokingFactory bean to register them directly to the default thumbnailRegistry bean.

… and he provides a substantial bean-within-a-bean approach.  Being the lazy sort, I tried Umut's technique by placing his code in a *-context.xml file in my alfresco/extensions folder & restarting, but calling a script containing …

document.createThumbnail("scImageThumbnail", true);
‍‍‍

… from a space-rule didn't produce this rendition, even overnight, though the standard renditions were created successfully this way.  This probably means that I did something wrong.

Jeff's article was written a while ago (2009).  How would you add a new rendition definition to the 4.2e thumbnail service today?  Have you gotten the MethodInvokingFactory to work for adding renditions or for other Alfresco-related purposes?

Thanks for your time.

Don

arnoldschrijve1

Hi,

I don't know about the script part, but the trick with the MethodInvokingFactory bean worked quite well….registered a new thumbnail this way, then afterwards triggering the rendition in Java code, something more or less like this:

<java>
        QName thumbnailRenditionName = QName.createQName(
                NamespaceService.CONTENT_MODEL_1_0_URI, "assetThumbnail");
       
        // Trigger the renditionService to create Thumbnail image.
        RenditionDefinition assetThumbnailRendition =
                serviceRegistry.getRenditionService().loadRenditionDefinition(
                        thumbnailRenditionName);

            serviceRegistry.getRenditionService().render(
                    getNodeRef(), assetThumbnailRendition , new RenderCallback()
            {
                public void handleFailedRendition(Throwable t)
                {
                    // In the event of a failed (re-)rendition, delete the rendition node
                    if (logger.isDebugEnabled())
                    {
                        logger.debug("Stuff went wrong", t);
                    }
                }

                public void handleSuccessfulRendition(
                        ChildAssociationRef primaryParentOfNewRendition)
                {
                    // Stuff went right
                }
            });
</java>